The Experts below are selected from a list of 2694 Experts worldwide ranked by ideXlab platform
Alina Yang - One of the best experts on this subject based on the ideXlab platform.
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Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3
Nature Communications, 2012Co-Authors: Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Daniel C. Kwok, Nara Lee, Michael Kreshchuk, Alex Hayat, Sang-wook Cheong, Zhijun Xu, Alina YangAbstract:Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion at the interface between topological insulators and superconductors. Here we produce high-temperature superconductivity in Bi2Se3 and Bi2Te3 via proximity to Bi2Sr2CaCu2O8+δ, to access higher temperature and energy scales for this phenomenon. This was achieved by a new Mechanical Bonding technique that we developed, enabling the fabrication of high-quality junctions between materials, unobtainable by conventional approaches. We observe proximity-induced superconductivity in Bi2Se3 and Bi2Te3 persisting up to at least 80 K—a temperature an order of magnitude higher than any previous observations. Moreover, the induced superconducting gap in our devices reaches values of 10 mV, significantly enhancing the relevant energy scales. Our results open new directions for fundamental studies in condensed matter physics and enable a wide range of applications in spintronics and quantum computing.
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Hybrid high-temperature-superconductor-semiconductor tunnel diode
Physical Review X, 2012Co-Authors: Alex Hayat, Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Alina Yang, Igor G. Savelyev, M. Blumin, G. D. Gu, Zhijun Xu, Harry E. RudaAbstract:We report the demonstration of hybrid high-Tc-superconductor–semiconductor tunnel junctions, enabling new interdisciplinary directions in condensed matter research. The devices are fabricated by our newly developed Mechanical-Bonding technique, resulting in high-Tc-superconductor–semiconductor tunnel diodes. Tunneling-spectra characterization of the hybrid junctions of Bi2Sr2CaCu2O8+δ combined with bulk GaAs, or a GaAs/AlGaAs quantum well, exhibits excess voltage and nonlinearity, similarly to spectra obtained in scanning-tunneling microscopy, and is in good agreement with theoretical predictions for a d-wave-superconductor–normal-material junction. Additional junctions are demonstrated using Bi2Sr2CaCu2O8+δ combined with graphite or Bi2Te3. Our results pave the way for new methods in unconventional superconductivity studies, novel materials, and quantum technology applications.
E.s. Focke - One of the best experts on this subject based on the ideXlab platform.
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Reeling of tight fit pipe
2007Co-Authors: E.s. FockeAbstract:If it would be possible to install Tight Fit Pipe by means of reeling, it would be an attractive new option for the exploitation of offshore oil and gas fields containing corrosive hydrocarbons. Tight Fit Pipe is a Mechanically bonded double walled pipe where a corrosion resistant alloy liner pipe is Mechanically fitted inside a carbon steel outer pipe through a thermo-hydraulic manufacturing process. Reeling is a fast method of offshore pipeline installation where a pipe is spooled on a reel, which is positioned on a vessel. The vessel subsequently sails to the offshore location where the pipe is unwound, straightened and deployed to the seabed. However, reeling of Tight Fit Pipe is not yet proven technology. The reeling process imposes high plastic strains (due to bending) in the pipe, which may cause unacceptable liner pipe wrinkling and Tight Fit Pipe ovalisation. This PhD project aimed to make a contribution to the possible development of the installation of Tight Fit Pipe by means of the reeling method. The focus of this research was on the initiation and the degree of liner pipe wrinkling as well as the degree of ovalisation occurring during the spooling-on phase of the reeling process, both theoretically and experimentally; the latter by performing full scale bending tests on 12.75 inch outer diameter Tight Fit Pipe. One of the test results indicates that a higher Mechanical bending strength decreases liner pipe wrinkling and makes the Tight Fit Pipe more suitable for reeling. However, test results also show that the Mechanical Bonding strength for the Tight Fit Pipe tested was significantly reduced, irrespective of whether a high or a low initial Mechanical Bonding strength had been used prior to spooling-on. These findings justify further research into this phenomenon as the eventual Mechanical Bonding strength after reeling installation may be vital for its anticipated application during operation.
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Reeling of Tight Fit Pipe (TFP)
Volume 3: Pipeline and Riser Technology; CFD and VIV, 2007Co-Authors: E.s. Focke, E. Karjadi, A.m. Gresnigt, J. Meek, H. NakasugiAbstract:A 12.75 inch outer diameter single walled pipe bending test was executed and theoretical and FE analysis of this test was performed as preparation for 12.75 inch outer diameter TFP bending tests. The main objective of the TFP bending tests was to determine the initiation and degree of liner wrinkling occurring during the TFP spooling-on phase when simulating the reeling pipelay installation method. Due to lack of a definition of liner wrinkling initiation, the crossing of a certain threshold of the liner wrinkle height was defined as liner wrinkling initiation. The bending tests results indicated that (1) the extent of liner wrinkling decreased if TFP with a high Mechanical Bonding strength was used. (2) The presence of a circumferential weld in the highly bonded TFPs initiated higher liner wrinkles at lower curvatures than in case no circumferential weld was present. (3) The ERW outer pipe longitudinal weld did not result in higher liner wrinkles. API residual compressive stress tests showed that the initial Mechanical Bonding strength in the 12.75 inch TFP used in this research was significantly reduced, irrespective of whether a high or a low initial Mechanical Bonding strength had been used prior to spooling-on. These findings justify further research into this phenomenon as the eventual Mechanical Bonding strength after reeling installation may be vital for its anticipated application during operation.Copyright © 2007 by ASME
Parisa Zareapour - One of the best experts on this subject based on the ideXlab platform.
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Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3
Nature Communications, 2012Co-Authors: Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Daniel C. Kwok, Nara Lee, Michael Kreshchuk, Alex Hayat, Sang-wook Cheong, Zhijun Xu, Alina YangAbstract:Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion at the interface between topological insulators and superconductors. Here we produce high-temperature superconductivity in Bi2Se3 and Bi2Te3 via proximity to Bi2Sr2CaCu2O8+δ, to access higher temperature and energy scales for this phenomenon. This was achieved by a new Mechanical Bonding technique that we developed, enabling the fabrication of high-quality junctions between materials, unobtainable by conventional approaches. We observe proximity-induced superconductivity in Bi2Se3 and Bi2Te3 persisting up to at least 80 K—a temperature an order of magnitude higher than any previous observations. Moreover, the induced superconducting gap in our devices reaches values of 10 mV, significantly enhancing the relevant energy scales. Our results open new directions for fundamental studies in condensed matter physics and enable a wide range of applications in spintronics and quantum computing.
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Hybrid high-temperature-superconductor-semiconductor tunnel diode
Physical Review X, 2012Co-Authors: Alex Hayat, Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Alina Yang, Igor G. Savelyev, M. Blumin, G. D. Gu, Zhijun Xu, Harry E. RudaAbstract:We report the demonstration of hybrid high-Tc-superconductor–semiconductor tunnel junctions, enabling new interdisciplinary directions in condensed matter research. The devices are fabricated by our newly developed Mechanical-Bonding technique, resulting in high-Tc-superconductor–semiconductor tunnel diodes. Tunneling-spectra characterization of the hybrid junctions of Bi2Sr2CaCu2O8+δ combined with bulk GaAs, or a GaAs/AlGaAs quantum well, exhibits excess voltage and nonlinearity, similarly to spectra obtained in scanning-tunneling microscopy, and is in good agreement with theoretical predictions for a d-wave-superconductor–normal-material junction. Additional junctions are demonstrated using Bi2Sr2CaCu2O8+δ combined with graphite or Bi2Te3. Our results pave the way for new methods in unconventional superconductivity studies, novel materials, and quantum technology applications.
Alex Hayat - One of the best experts on this subject based on the ideXlab platform.
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Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3
Nature Communications, 2012Co-Authors: Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Daniel C. Kwok, Nara Lee, Michael Kreshchuk, Alex Hayat, Sang-wook Cheong, Zhijun Xu, Alina YangAbstract:Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion at the interface between topological insulators and superconductors. Here we produce high-temperature superconductivity in Bi2Se3 and Bi2Te3 via proximity to Bi2Sr2CaCu2O8+δ, to access higher temperature and energy scales for this phenomenon. This was achieved by a new Mechanical Bonding technique that we developed, enabling the fabrication of high-quality junctions between materials, unobtainable by conventional approaches. We observe proximity-induced superconductivity in Bi2Se3 and Bi2Te3 persisting up to at least 80 K—a temperature an order of magnitude higher than any previous observations. Moreover, the induced superconducting gap in our devices reaches values of 10 mV, significantly enhancing the relevant energy scales. Our results open new directions for fundamental studies in condensed matter physics and enable a wide range of applications in spintronics and quantum computing.
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Hybrid high-temperature-superconductor-semiconductor tunnel diode
Physical Review X, 2012Co-Authors: Alex Hayat, Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Alina Yang, Igor G. Savelyev, M. Blumin, G. D. Gu, Zhijun Xu, Harry E. RudaAbstract:We report the demonstration of hybrid high-Tc-superconductor–semiconductor tunnel junctions, enabling new interdisciplinary directions in condensed matter research. The devices are fabricated by our newly developed Mechanical-Bonding technique, resulting in high-Tc-superconductor–semiconductor tunnel diodes. Tunneling-spectra characterization of the hybrid junctions of Bi2Sr2CaCu2O8+δ combined with bulk GaAs, or a GaAs/AlGaAs quantum well, exhibits excess voltage and nonlinearity, similarly to spectra obtained in scanning-tunneling microscopy, and is in good agreement with theoretical predictions for a d-wave-superconductor–normal-material junction. Additional junctions are demonstrated using Bi2Sr2CaCu2O8+δ combined with graphite or Bi2Te3. Our results pave the way for new methods in unconventional superconductivity studies, novel materials, and quantum technology applications.
Zhijun Xu - One of the best experts on this subject based on the ideXlab platform.
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Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3
Nature Communications, 2012Co-Authors: Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Daniel C. Kwok, Nara Lee, Michael Kreshchuk, Alex Hayat, Sang-wook Cheong, Zhijun Xu, Alina YangAbstract:Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion at the interface between topological insulators and superconductors. Here we produce high-temperature superconductivity in Bi2Se3 and Bi2Te3 via proximity to Bi2Sr2CaCu2O8+δ, to access higher temperature and energy scales for this phenomenon. This was achieved by a new Mechanical Bonding technique that we developed, enabling the fabrication of high-quality junctions between materials, unobtainable by conventional approaches. We observe proximity-induced superconductivity in Bi2Se3 and Bi2Te3 persisting up to at least 80 K—a temperature an order of magnitude higher than any previous observations. Moreover, the induced superconducting gap in our devices reaches values of 10 mV, significantly enhancing the relevant energy scales. Our results open new directions for fundamental studies in condensed matter physics and enable a wide range of applications in spintronics and quantum computing.
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Hybrid high-temperature-superconductor-semiconductor tunnel diode
Physical Review X, 2012Co-Authors: Alex Hayat, Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Alina Yang, Igor G. Savelyev, M. Blumin, G. D. Gu, Zhijun Xu, Harry E. RudaAbstract:We report the demonstration of hybrid high-Tc-superconductor–semiconductor tunnel junctions, enabling new interdisciplinary directions in condensed matter research. The devices are fabricated by our newly developed Mechanical-Bonding technique, resulting in high-Tc-superconductor–semiconductor tunnel diodes. Tunneling-spectra characterization of the hybrid junctions of Bi2Sr2CaCu2O8+δ combined with bulk GaAs, or a GaAs/AlGaAs quantum well, exhibits excess voltage and nonlinearity, similarly to spectra obtained in scanning-tunneling microscopy, and is in good agreement with theoretical predictions for a d-wave-superconductor–normal-material junction. Additional junctions are demonstrated using Bi2Sr2CaCu2O8+δ combined with graphite or Bi2Te3. Our results pave the way for new methods in unconventional superconductivity studies, novel materials, and quantum technology applications.