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  • 1
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    Inducing magnetism onto the surface of a topological crystalline insulator (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-05-13
    Description: Author(s): B. A. Assaf, F. Katmis, P. Wei, Cui-Zu Chang, B. Satpati, J. S. Moodera, and D. Heiman Inducing magnetism onto a topological crystalline insulator (TCI) has been predicted to result in several novel quantum electromagnetic effects. This is a consequence of the highly strain-sensitive band topology of such symmetry-protected systems. We thus show that placing the TCI surface of SnTe in... [Phys. Rev. B 91, 195310] Published Mon May 11, 2015
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    High Fermi-level spin polarization in the (Bi_{1−x} Sb_{x} )_{2} Te_{3} family of topological insulators: A point contact Andreev reflection study (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-09-14
    Description: Author(s): K. Borisov, C.-Z. Chang, J. S. Moodera, and P. Stamenov Point contact Andreev reflection spectroscopy is employed to extract the effective Fermi-level spin polarization of three distinct compositions from the ( Bi 1 − x Sb x ) 2 Te 3 topological insulator family. The end members, Bi 2 Te 3 and Sb 2 Te 3 , exhibit high polarization of 70(4)% and 57(3)%, respectively. High… [Phys. Rev. B 94, 094415] Published Tue Sep 13, 2016
    Keywords: Magnetism
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-12-06
    Description: Author(s): H. Steinberg, J.-B. Laloë, V. Fatemi, J. S. Moodera, and P. Jarillo-Herrero [Phys. Rev. B 84, 233101] Published Mon Dec 05, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Quantum coherent transport in SnTe topological crystalline insulator thin films (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-09-13
    Description: Topological crystalline insulators (TCI) are unique systems where a band inversion that is protected by crystalline mirror symmetry leads to a multiplicity of topological surface states. Binary SnTe is an attractive lead-free TCI compound; the present work on high-quality thin films provides a route for increasing the mobility and reducing the carrier density of SnTe without chemical doping. Results of quantum coherent magnetotransport measurements reveal a multiplicity of Dirac surface states that are unique to TCI. Modeling of the weak antilocalization shows variations in the extracted number of carrier valleys that reflect the role of coherent intervalley scattering in coupling different Dirac states on the degenerate TCI surface.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Proposal for a phase-coherent thermoelectric transistor (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-16
    Description: Identifying materials and devices which offer efficient thermoelectric effects at low temperature is a major obstacle for the development of thermal management strategies for low-temperature electronic systems. Superconductors cannot offer a solution since their near perfect electron-hole symmetry leads to a negligible thermoelectric response; however, here we demonstrate theoretically a superconducting thermoelectric transistor which offers unparalleled figures of merit of up to ∼45 and Seebeck coefficients as large as a few mV/K at sub-Kelvin temperatures. The device is also phase-tunable meaning its thermoelectric response for power generation can be precisely controlled with a small magnetic field. Our concept is based on a superconductor-normal metal-superconductor interferometer in which the normal metal weak-link is tunnel coupled to a ferromagnetic insulator and a Zeeman split superconductor. Upon application of an external magnetic flux, the interferometer enables phase-coherent manipulation of thermoelectric properties whilst offering efficiencies which approach the Carnot limit.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    Measuring the spin polarization of a metal with a superconducting point contact (1998)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1998-10-02
    Description: A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals. Because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermi surface, the differential conductance of the point contact can reveal the spin polarization of the metal. This technique has been applied to a variety of metals where the spin polarization ranges from 35 to 90 percent: Ni0.8Fe0.2, Ni, Co, Fe, NiMnSb, La0.7Sr0.3MnO3, and CrO2.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Soulen Jr RJ -- Byers -- Osofsky -- Nadgorny -- Ambrose -- Cheng -- Broussard C T Tanaka PR -- Nowak -- Moodera -- Barry -- Coey -- New York, N.Y. -- Science. 1998 Oct 2;282(5386):85-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉R. J. Soulen Jr., M. S. Osofsky, B. Nadgorny, T. Ambrose, S. F. Cheng, P. R. Broussard, Materials Physics, Naval Research Laboratory, Washington, DC 20375, USA. J. M. Byers, Department of Physics, George Washington University, Washington, DC 2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9756482" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Signatures of long-range-correlated disorder in the magnetotransport of ultrathin topological insulators (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-12-20
    Description: Author(s): D. Nandi, B. Skinner, G. H. Lee, K.-F. Huang, K. Shain, Cui-Zu Chang, Y. Ou, S.-P. Lee, J. Ward, J. S. Moodera, P. Kim, B. I. Halperin, and A. Yacoby In an ultrathin topological insulator (TI) film, a hybridization gap opens in the TI surface states, and the system is expected to become either a trivial insulator or a quantum spin Hall insulator when the chemical potential is within the hybridization gap. Here we show, however, that these insulat... [Phys. Rev. B 98, 214203] Published Wed Dec 19, 2018
    Keywords: Inhomogeneous, disordered, and partially ordered systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 8
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    Materials chemistry: A magnetic facelift for non-magnetic metals (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-08-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Raman, Karthik V -- Moodera, Jagadeesh S -- England -- Nature. 2015 Aug 6;524(7563):42-3. doi: 10.1038/524042a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad, Telangana 500 075, India. ; Department of Physics, Francis Bitter Magnet Laboratory, and at the Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26245578" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 9
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    Interface-engineered templates for molecular spin memory devices (2013)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2013-01-25
    Description: The use of molecular spin state as a quantum of information for storage, sensing and computing has generated considerable interest in the context of next-generation data storage and communication devices, opening avenues for developing multifunctional molecular spintronics. Such ideas have been researched extensively, using single-molecule magnets and molecules with a metal ion or nitrogen vacancy as localized spin-carrying centres for storage and for realizing logic operations. However, the electronic coupling between the spin centres of these molecules is rather weak, which makes construction of quantum memory registers a challenging task. In this regard, delocalized carbon-based radical species with unpaired spin, such as phenalenyl, have shown promise. These phenalenyl moieties, which can be regarded as graphene fragments, are formed by the fusion of three benzene rings and belong to the class of open-shell systems. The spin structure of these molecules responds to external stimuli (such as light, and electric and magnetic fields), which provides novel schemes for performing spin memory and logic operations. Here we construct a molecular device using such molecules as templates to engineer interfacial spin transfer resulting from hybridization and magnetic exchange interaction with the surface of a ferromagnet; the device shows an unexpected interfacial magnetoresistance of more than 20 per cent near room temperature. Moreover, we successfully demonstrate the formation of a nanoscale magnetic molecule with a well-defined magnetic hysteresis on ferromagnetic surfaces. Owing to strong magnetic coupling with the ferromagnet, such independent switching of an adsorbed magnetic molecule has been unsuccessful with single-molecule magnets. Our findings suggest the use of chemically amenable phenalenyl-based molecules as a viable and scalable platform for building molecular-scale quantum spin memory and processors for technological development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Raman, Karthik V -- Kamerbeek, Alexander M -- Mukherjee, Arup -- Atodiresei, Nicolae -- Sen, Tamal K -- Lazic, Predrag -- Caciuc, Vasile -- Michel, Reent -- Stalke, Dietmar -- Mandal, Swadhin K -- Blugel, Stefan -- Munzenberg, Markus -- Moodera, Jagadeesh S -- England -- Nature. 2013 Jan 24;493(7433):509-13. doi: 10.1038/nature11719.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Massachusetts 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23344361" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 10
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    TOPOLOGICAL MATTER. Observation of chiral currents at the magnetic domain boundary of a topological insulator (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-08-15
    Description: A magnetic domain boundary on the surface of a three-dimensional topological insulator is predicted to host a chiral edge state, but direct demonstration is challenging. We used a scanning superconducting quantum interference device to show that current in a magnetized topological insulator heterostructure (EuS/Bi2Se3) flows at the edge when the Fermi level is gate-tuned to the surface band gap. We further induced micrometer-scale magnetic structures on the heterostructure and detected a chiral edge current at the magnetic domain boundary. The chirality of the current was determined by magnetization of the surrounding domain, and its magnitude by the local chemical potential rather than the applied current. Such magnetic structures provide a platform for detecting topological magnetoelectric effects and may enable progress in quantum information processing and spintronics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Y H -- Kirtley, J R -- Katmis, F -- Jarillo-Herrero, P -- Moodera, J S -- Moler, K A -- New York, N.Y. -- Science. 2015 Aug 28;349(6251):948-52. doi: 10.1126/science.aaa0508. Epub 2015 Aug 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA. wangyhv@stanford.edu kmoler@stanford.edu. ; Department of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA. ; Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. ; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26272905" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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