Conductance fluctuations of chiral metals |
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| Institution: | 1. Department of Physics, University of California, Santa Barbara, CA, 93106, U.S.A.;2. Department of Materials Engineering, University of California, Santa Barbara, CA, 93106, U.S.A.;1. Department of Physics, Boston University, Boston, MA 02215, USA;2. Department of Physics, University of California, Berkeley, CA 94720, USA;3. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;4. Theory of Quantum and Complex Systems, Universiteit Antwerpen, B-2610 Antwerpen, Belgium;1. Department of Physics, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan;2. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, BUCT-CWRU International Joint Laboratory, College of Energy, Beijing University of Chemical Technology, Beijing 100029, China;3. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;4. National Center for Nanotechnology, Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, 45650 Islamabad, Pakistan;5. School of Materials, Sun Yat-sen University, Guangzhou 510275, China;1. Nanomedical Graduate Program, Yonsei University, Seoul 120-749, Republic of Korea;2. Division of Rheumatology, Department of Internal Medicine, Institute for Immunology and Immunological Disease, Brain Korea 21 PLUS Project for Medical Science, Yonsei University, Seoul 120-752, Republic of Korea;3. Department of Physics, Yonsei University, Seoul 120-749, Republic of Korea |
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| Abstract: | We study conductance fluctuations of the edge-state sheath that forms in the integer quantum Hall effect from the coupled edge states of a GaAs/AlxGa1 − xAs multilayer. Comparison of the measured variance in the vertical conductance to recent theoretical predictions for mesoscopic fluctuations suggests dephasing lengths of 1–10 μm around the sheath perimeter at low temperatures. However, inconsistencies in the estimated inelastic lengths indicate that present understanding of dephasing on the sheath is incomplete. |
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