The Experts below are selected from a list of 551685 Experts worldwide ranked by ideXlab platform
A P Mackenzie - One of the best experts on this subject based on the ideXlab platform.
-
thermodynamic evidence for a two component superconducting Order Parameter in sr2ruo4
Nature Physics, 2021Co-Authors: Sayak Ghosh, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Arkady Shekhter, M Brando, B J RamshawAbstract:Sr2RuO4 has stood as the leading candidate for a spin-triplet superconductor for 26 years1. However, recent NMR experiments have cast doubt on this candidacy2,3 and it is difficult to find a theory of superconductivity that is consistent with all experiments. The Order Parameter symmetry for this material therefore remains an open question. Symmetry-based experiments are needed that can rule out broad classes of possible superconducting Order Parameters. Here, we use resonant ultrasound spectroscopy to measure the entire symmetry-resolved elastic tensor of Sr2RuO4 through the superconducting transition. We observe a thermodynamic discontinuity in the shear elastic modulus c66, which implies that the superconducting Order Parameter has two components. A two-component p-wave Order Parameter, such as px + ipy, naturally satisfies this requirement. As this Order Parameter appears to have been precluded by recent NMR experiments, we suggest that two other two-component Order Parameters, namely $$\{{d}_{xz},{d}_{yz}\}$$ and $$\{{d}_{{x}^{2}-{y}^{2}},{g}_{xy({x}^{2}-{y}^{2})}\}$$ , are now the prime candidates for the Order Parameter of Sr2RuO4. Ultrasound measurements show that the superconducting Order Parameter in strontium ruthenate must have two components.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, Yueshun Su, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Shankar RaghuAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected ‘split’ transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system. 17O nuclear magnetic resonance measurements on Sr2RuO4 reveal a drop of the Knight shift in the superconducting state, contradicting previous work and imposing tight constraints on the Order Parameter symmetry of the system.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, A P Mackenzie, Yi Luo, Naoki KikugawaAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected 'split' transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system.
Naoki Kikugawa - One of the best experts on this subject based on the ideXlab platform.
-
thermodynamic evidence for a two component superconducting Order Parameter in sr2ruo4
Nature Physics, 2021Co-Authors: Sayak Ghosh, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Arkady Shekhter, M Brando, B J RamshawAbstract:Sr2RuO4 has stood as the leading candidate for a spin-triplet superconductor for 26 years1. However, recent NMR experiments have cast doubt on this candidacy2,3 and it is difficult to find a theory of superconductivity that is consistent with all experiments. The Order Parameter symmetry for this material therefore remains an open question. Symmetry-based experiments are needed that can rule out broad classes of possible superconducting Order Parameters. Here, we use resonant ultrasound spectroscopy to measure the entire symmetry-resolved elastic tensor of Sr2RuO4 through the superconducting transition. We observe a thermodynamic discontinuity in the shear elastic modulus c66, which implies that the superconducting Order Parameter has two components. A two-component p-wave Order Parameter, such as px + ipy, naturally satisfies this requirement. As this Order Parameter appears to have been precluded by recent NMR experiments, we suggest that two other two-component Order Parameters, namely $$\{{d}_{xz},{d}_{yz}\}$$ and $$\{{d}_{{x}^{2}-{y}^{2}},{g}_{xy({x}^{2}-{y}^{2})}\}$$ , are now the prime candidates for the Order Parameter of Sr2RuO4. Ultrasound measurements show that the superconducting Order Parameter in strontium ruthenate must have two components.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, Yueshun Su, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Shankar RaghuAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected ‘split’ transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system. 17O nuclear magnetic resonance measurements on Sr2RuO4 reveal a drop of the Knight shift in the superconducting state, contradicting previous work and imposing tight constraints on the Order Parameter symmetry of the system.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, A P Mackenzie, Yi Luo, Naoki KikugawaAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected 'split' transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system.
Guangcan Guo - One of the best experts on this subject based on the ideXlab platform.
-
measuring a dynamical topological Order Parameter in quantum walks
Light-Science & Applications, 2020Co-Authors: Qinqin Wang, Markus Heyl, Jan Carl Budich, Weiwei Pan, Zhe Chen, Munsif Jan, Kai Sun, Yongjian Han, Guangcan GuoAbstract:Quantum processes of inherent dynamical nature, such as quantum walks, defy a description in terms of an equilibrium statistical physics ensemble. Until now, identifying the general principles behind the underlying unitary quantum dynamics has remained a key challenge. Here, we show and experimentally observe that split-step quantum walks admit a characterization in terms of a dynamical topological Order Parameter (DTOP). This integer-quantized DTOP measures, at a given time, the winding of the geometric phase accumulated by the wavefunction during a quantum walk. We observe distinct dynamical regimes in our experimentally realized quantum walks, and each regime can be attributed to a qualitatively different temporal behavior of the DTOP. Upon identifying an equivalent many-body problem, we reveal an intriguing connection between the nonanalytic changes of the DTOP in quantum walks and the occurrence of dynamical quantum phase transitions. A model describing the random walks of quantum particles has been developed by researchers in China and Germany. Classical phenomena such as molecules moving in gases or animals foraging for food can be described by random walks, where every step is chosen through processes like tossing a coin. For quantum particles, randomness arises from the transitions and entanglement of quantum states, but it is difficult to describe the emerging statistical patterns in these quantum walks. Chuan-Feng Li at the University of Science and Technology of China, Hefei, and co-workers used an experimental setup for observing the quantum walks of single photons. They found that the walks could be characterized by a so-called dynamical topological Order Parameter that describes the behavior of the particle’s wavefunction during the walk, thereby linking quantum effects to physical spatial measurements.
-
measuring a dynamical topological Order Parameter in quantum walks
Light-Science & Applications, 2020Co-Authors: Qinqin Wang, Markus Heyl, Jan Carl Budich, Weiwei Pan, Zhe Chen, Munsif Jan, Kai Sun, Yongjian Han, Guangcan GuoAbstract:Quantum processes of inherent dynamical nature, such as quantum walks, defy a description in terms of an equilibrium statistical physics ensemble. Until now, identifying the general principles behind the underlying unitary quantum dynamics has remained a key challenge. Here, we show and experimentally observe that split-step quantum walks admit a characterization in terms of a dynamical topological Order Parameter (DTOP). This integer-quantized DTOP measures, at a given time, the winding of the geometric phase accumulated by the wavefunction during a quantum walk. We observe distinct dynamical regimes in our experimentally realized quantum walks, and each regime can be attributed to a qualitatively different temporal behavior of the DTOP. Upon identifying an equivalent many-body problem, we reveal an intriguing connection between the nonanalytic changes of the DTOP in quantum walks and the occurrence of dynamical quantum phase transitions.
-
measuring a dynamical topological Order Parameter in quantum walks
arXiv: Quantum Physics, 2018Co-Authors: Qinqin Wang, Markus Heyl, Jan Carl Budich, Weiwei Pan, Zhe Chen, Munsif Jan, Kai Sun, Yongjian Han, Guangcan GuoAbstract:Quantum processes of inherent dynamical nature, such as quantum walks (QWs), defy a description in terms of an equilibrium statistical physics ensemble. Up to now, it has remained a key challenge to identify general principles behind the underlying unitary quantum dynamics. Here, we show and experimentally observe that split-step QWs admit a characterization in terms of a dynamical topological Order Parameter (DTOP). This integer-quantized DTOP measures, at a given time, the winding of the geometric phase accumulated by the wave-function during the QW. We observe distinct dynamical regimes in our experimentally realized QWs each of which can be attributed to a qualitatively different temporal behavior of the DTOP. Upon identifying an equivalent many-body problem, we reveal an intriguing connection between the nonanalytic changes of the DTOP in QWs and the occurrence of dynamical quantum phase transitions.
D A Sokolov - One of the best experts on this subject based on the ideXlab platform.
-
thermodynamic evidence for a two component superconducting Order Parameter in sr2ruo4
Nature Physics, 2021Co-Authors: Sayak Ghosh, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Arkady Shekhter, M Brando, B J RamshawAbstract:Sr2RuO4 has stood as the leading candidate for a spin-triplet superconductor for 26 years1. However, recent NMR experiments have cast doubt on this candidacy2,3 and it is difficult to find a theory of superconductivity that is consistent with all experiments. The Order Parameter symmetry for this material therefore remains an open question. Symmetry-based experiments are needed that can rule out broad classes of possible superconducting Order Parameters. Here, we use resonant ultrasound spectroscopy to measure the entire symmetry-resolved elastic tensor of Sr2RuO4 through the superconducting transition. We observe a thermodynamic discontinuity in the shear elastic modulus c66, which implies that the superconducting Order Parameter has two components. A two-component p-wave Order Parameter, such as px + ipy, naturally satisfies this requirement. As this Order Parameter appears to have been precluded by recent NMR experiments, we suggest that two other two-component Order Parameters, namely $$\{{d}_{xz},{d}_{yz}\}$$ and $$\{{d}_{{x}^{2}-{y}^{2}},{g}_{xy({x}^{2}-{y}^{2})}\}$$ , are now the prime candidates for the Order Parameter of Sr2RuO4. Ultrasound measurements show that the superconducting Order Parameter in strontium ruthenate must have two components.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, Yueshun Su, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Shankar RaghuAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected ‘split’ transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system. 17O nuclear magnetic resonance measurements on Sr2RuO4 reveal a drop of the Knight shift in the superconducting state, contradicting previous work and imposing tight constraints on the Order Parameter symmetry of the system.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, A P Mackenzie, Yi Luo, Naoki KikugawaAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected 'split' transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system.
Fabian Jerzembeck - One of the best experts on this subject based on the ideXlab platform.
-
thermodynamic evidence for a two component superconducting Order Parameter in sr2ruo4
Nature Physics, 2021Co-Authors: Sayak Ghosh, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Arkady Shekhter, M Brando, B J RamshawAbstract:Sr2RuO4 has stood as the leading candidate for a spin-triplet superconductor for 26 years1. However, recent NMR experiments have cast doubt on this candidacy2,3 and it is difficult to find a theory of superconductivity that is consistent with all experiments. The Order Parameter symmetry for this material therefore remains an open question. Symmetry-based experiments are needed that can rule out broad classes of possible superconducting Order Parameters. Here, we use resonant ultrasound spectroscopy to measure the entire symmetry-resolved elastic tensor of Sr2RuO4 through the superconducting transition. We observe a thermodynamic discontinuity in the shear elastic modulus c66, which implies that the superconducting Order Parameter has two components. A two-component p-wave Order Parameter, such as px + ipy, naturally satisfies this requirement. As this Order Parameter appears to have been precluded by recent NMR experiments, we suggest that two other two-component Order Parameters, namely $$\{{d}_{xz},{d}_{yz}\}$$ and $$\{{d}_{{x}^{2}-{y}^{2}},{g}_{xy({x}^{2}-{y}^{2})}\}$$ , are now the prime candidates for the Order Parameter of Sr2RuO4. Ultrasound measurements show that the superconducting Order Parameter in strontium ruthenate must have two components.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, Yueshun Su, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, Naoki Kikugawa, A P Mackenzie, Shankar RaghuAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected ‘split’ transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system. 17O nuclear magnetic resonance measurements on Sr2RuO4 reveal a drop of the Knight shift in the superconducting state, contradicting previous work and imposing tight constraints on the Order Parameter symmetry of the system.
-
constraints on the superconducting Order Parameter in sr2ruo4 from oxygen 17 nuclear magnetic resonance
Nature, 2019Co-Authors: A Pustogow, Aaron Chronister, D A Sokolov, Fabian Jerzembeck, Clifford W Hicks, A P Mackenzie, Yi Luo, Naoki KikugawaAbstract:Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity Order Parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected 'split' transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the Order Parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the Order Parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the Order Parameter symmetry of this archetypal system.
