The Experts below are selected from a list of 4842 Experts worldwide ranked by ideXlab platform
Wolfgang Wernsdorfer - One of the best experts on this subject based on the ideXlab platform.
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Strong spin–phonon coupling between a single-molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:Magnetic relaxation processes were first discussed for a crystal of paramagnetic transition ions^ 1 . It was suggested that mechanical vibrations of the crystal lattice (phonons) modulate the crystal electric field of the magnetic ion, thus inducing a ‘direct’ relaxation between two different spin states^ 1 , 2 , 3 . Direct relaxation has also been predicted for single-molecule magnets with a large spin and a high magnetic anisotropy^ 1 , 4 , 5 , 6 , 7 and was first demonstrated in a Mn_12 acetate crystal^ 8 . The spin-lattice relaxation time for such a direct transition is limited by the phonon density of states at the spin resonance^ 1 . In a three-dimensional System, such as a single-molecule magnet crystal, the phonon energy spectrum is continuous, but in a one-dimensional System, like a suspended carbon nanotube, the spectrum is discrete and can be engineered to an extremely low density of states^ 9 . An individual single-molecule magnet, coupled to a suspended carbon nanotube, should therefore exhibit extremely long relaxation times^ 9 and the System's reduced size should result in a strong spin–phonon coupling^ 10 , 11 . Here, we provide the first experimental evidence for a strong spin–phonon coupling between a single molecule spin and a carbon nanotube resonator, ultimately enabling coherent spin manipulation and quantum entanglement^ 10 , 11 . The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
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strong spin phonon coupling between a single molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
Marc Ganzhorn - One of the best experts on this subject based on the ideXlab platform.
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Strong spin–phonon coupling between a single-molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:Magnetic relaxation processes were first discussed for a crystal of paramagnetic transition ions^ 1 . It was suggested that mechanical vibrations of the crystal lattice (phonons) modulate the crystal electric field of the magnetic ion, thus inducing a ‘direct’ relaxation between two different spin states^ 1 , 2 , 3 . Direct relaxation has also been predicted for single-molecule magnets with a large spin and a high magnetic anisotropy^ 1 , 4 , 5 , 6 , 7 and was first demonstrated in a Mn_12 acetate crystal^ 8 . The spin-lattice relaxation time for such a direct transition is limited by the phonon density of states at the spin resonance^ 1 . In a three-dimensional System, such as a single-molecule magnet crystal, the phonon energy spectrum is continuous, but in a one-dimensional System, like a suspended carbon nanotube, the spectrum is discrete and can be engineered to an extremely low density of states^ 9 . An individual single-molecule magnet, coupled to a suspended carbon nanotube, should therefore exhibit extremely long relaxation times^ 9 and the System's reduced size should result in a strong spin–phonon coupling^ 10 , 11 . Here, we provide the first experimental evidence for a strong spin–phonon coupling between a single molecule spin and a carbon nanotube resonator, ultimately enabling coherent spin manipulation and quantum entanglement^ 10 , 11 . The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
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strong spin phonon coupling between a single molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
Mario Ruben - One of the best experts on this subject based on the ideXlab platform.
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Strong spin–phonon coupling between a single-molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:Magnetic relaxation processes were first discussed for a crystal of paramagnetic transition ions^ 1 . It was suggested that mechanical vibrations of the crystal lattice (phonons) modulate the crystal electric field of the magnetic ion, thus inducing a ‘direct’ relaxation between two different spin states^ 1 , 2 , 3 . Direct relaxation has also been predicted for single-molecule magnets with a large spin and a high magnetic anisotropy^ 1 , 4 , 5 , 6 , 7 and was first demonstrated in a Mn_12 acetate crystal^ 8 . The spin-lattice relaxation time for such a direct transition is limited by the phonon density of states at the spin resonance^ 1 . In a three-dimensional System, such as a single-molecule magnet crystal, the phonon energy spectrum is continuous, but in a one-dimensional System, like a suspended carbon nanotube, the spectrum is discrete and can be engineered to an extremely low density of states^ 9 . An individual single-molecule magnet, coupled to a suspended carbon nanotube, should therefore exhibit extremely long relaxation times^ 9 and the System's reduced size should result in a strong spin–phonon coupling^ 10 , 11 . Here, we provide the first experimental evidence for a strong spin–phonon coupling between a single molecule spin and a carbon nanotube resonator, ultimately enabling coherent spin manipulation and quantum entanglement^ 10 , 11 . The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
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strong spin phonon coupling between a single molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
Svetlana Klyatskaya - One of the best experts on this subject based on the ideXlab platform.
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Strong spin–phonon coupling between a single-molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:Magnetic relaxation processes were first discussed for a crystal of paramagnetic transition ions^ 1 . It was suggested that mechanical vibrations of the crystal lattice (phonons) modulate the crystal electric field of the magnetic ion, thus inducing a ‘direct’ relaxation between two different spin states^ 1 , 2 , 3 . Direct relaxation has also been predicted for single-molecule magnets with a large spin and a high magnetic anisotropy^ 1 , 4 , 5 , 6 , 7 and was first demonstrated in a Mn_12 acetate crystal^ 8 . The spin-lattice relaxation time for such a direct transition is limited by the phonon density of states at the spin resonance^ 1 . In a three-dimensional System, such as a single-molecule magnet crystal, the phonon energy spectrum is continuous, but in a one-dimensional System, like a suspended carbon nanotube, the spectrum is discrete and can be engineered to an extremely low density of states^ 9 . An individual single-molecule magnet, coupled to a suspended carbon nanotube, should therefore exhibit extremely long relaxation times^ 9 and the System's reduced size should result in a strong spin–phonon coupling^ 10 , 11 . Here, we provide the first experimental evidence for a strong spin–phonon coupling between a single molecule spin and a carbon nanotube resonator, ultimately enabling coherent spin manipulation and quantum entanglement^ 10 , 11 . The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
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strong spin phonon coupling between a single molecule magnet and a carbon nanotube Nanoelectromechanical System
Nature Nanotechnology, 2013Co-Authors: Marc Ganzhorn, Svetlana Klyatskaya, Mario Ruben, Wolfgang WernsdorferAbstract:The coupling between a single-molecule spin and a single phonon in a carbon nanotube is observed.
Kwanoh Kim - One of the best experts on this subject based on the ideXlab platform.
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Biobased High-Performance Rotary Micromotors for Individually Reconfigurable Micromachine Arrays and Microfluidic Applications
2016Co-Authors: Kwanoh Kim, Zexi Liang, Minliang Liu, Donglei “emma” FanAbstract:In this work, we report an innovative type of rotary biomicromachines by using diatom frustules as integrated active components, including the assembling, operation, and performance characterization. We further investigate and demonstrate unique applications of the biomicromachines in achieving individually reconfigurable micromachine arrays and microfluidic mixing. Diatom frustules are porous cell walls of diatoms made of silica. We assembled rotary micromachines consisting of diatom frustules serving as rotors and patterned magnets serving as bearings in electric fields. Ordered arrays of micromotors can be integrated and rotated with controlled orientation and a speed up to ∼3000 rpm, one of the highest rotational speeds in biomaterial-based rotary micromachines. Moreover, by exploiting the distinct electromechanical properties of diatom frustules and metallic nanowires, we realized the first reconfigurable rotary micro/nanomachine arrays with controllability in individual motors. Finally, the diatom micromachines are successfully integrated in microfluidic channels and operated as mixers. This work demonstrated the high-performance rotary micromachines by using bioinspired diatom frustules and their applications, which are essential for low-cost bio-microelectromechanical System/Nanoelectromechanical System (bio-MEMS/NEMS) devices and relevant to microfluidics
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Ultrahigh-speed rotating Nanoelectromechanical System devices assembled from nanoscale building blocks
Nature communications, 2014Co-Authors: Kwanoh Kim, Jianhe Guo, Donglei FanAbstract:The development of rotary nanomotors is crucial for advancing Nanoelectromechanical System technology. In this work, we report design, assembly and rotation of ordered arrays of nanomotors. The nanomotors are bottom-up assembled from nanoscale building blocks with nanowires as rotors, patterned nanomagnets as bearings and quadrupole microelectrodes as stators. Arrays of nanomotors rotate with controlled angle, speed (over 18,000 r.p.m.), and chirality by electric fields. Using analytical modelling, we reveal the fundamental nanoscale electrical, mechanical and magnetic interactions in the nanomotor System, which excellently agrees with experimental results and provides critical understanding for designing metallic Nanoelectromechanical Systems. The nanomotors can be continuously rotated for 15 h over 240,000 cycles. They are applied for controlled biochemical release and demonstrate releasing rate of biochemicals on nanoparticles that can be precisely tuned by mechanical rotations. The innovations reported in this research, from concept, design and actuation to application, are relevant to Nanoelectromechanical System, nanomedicine, microfluidics and lab-on-a-chip architectures.
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Ultrahigh-speed rotating Nanoelectromechanical System devices assembled from nanoscale building blocks
Nature Communications, 2014Co-Authors: Kwanoh Kim, Jianhe Guo, D. L. FanAbstract:Realising enhanced functionality in Nanoelectromechanical Systems relies on realising new fabrication and design approaches. Here, the authors report the bottom-up assembly of nanomotors, demonstrating rotation speeds of 18,000 revolutions per minute and continuous rotation for up to 15 h. The development of rotary nanomotors is crucial for advancing Nanoelectromechanical System technology. In this work, we report design, assembly and rotation of ordered arrays of nanomotors. The nanomotors are bottom-up assembled from nanoscale building blocks with nanowires as rotors, patterned nanomagnets as bearings and quadrupole microelectrodes as stators. Arrays of nanomotors rotate with controlled angle, speed (over 18,000 r.p.m.), and chirality by electric fields. Using analytical modelling, we reveal the fundamental nanoscale electrical, mechanical and magnetic interactions in the nanomotor System, which excellently agrees with experimental results and provides critical understanding for designing metallic Nanoelectromechanical Systems. The nanomotors can be continuously rotated for 15 h over 240,000 cycles. They are applied for controlled biochemical release and demonstrate releasing rate of biochemicals on nanoparticles that can be precisely tuned by mechanical rotations. The innovations reported in this research, from concept, design and actuation to application, are relevant to Nanoelectromechanical System, nanomedicine, microfluidics and lab-on-a-chip architectures.
