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Title: Point-contact spectroscopy of hopping transport : efffects of a magnetic field.

Abstract

The conductance of a point contact between two hopping insulators is expected to be dominated by the individual localized states in its vicinity. Here, we study the additional effects due to an external magnetic field. Combined with the measured conductance, the measured magnetoresistance provides detailed information on these states (e.g., their localization length, the energy difference, and the hopping distance between them). We also calculate the statistics of this magnetoresistance, which can be collected by changing the gate voltage in a single device. Since the conductance is dominated by the quantum interference of particular mesoscopic structures near the point contact, it is predicted to exhibit Aharonov-Bohm oscillations, which yield information on the geometry of these structures. These oscillations also depend on local spin accumulation and correlations, which can be modified by the external field. Finally, we also estimate the mesoscopic Hall voltage due to these structures.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Israel Science Foundation; German Federal Ministry of Education and Research (BMBF)
OSTI Identifier:
948795
Report Number(s):
ANL/MSD/JA-58541
Journal ID: ISSN 0163-1829; PRBMDO; TRN: US200907%%199
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. B; Journal Volume: 75; Journal Issue: 20 ; 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
42 ENGINEERING; ELECTRICAL INSULATORS; MAGNETORESISTANCE; OSCILLATIONS; ELECTRIC CONDUCTIVITY; AHARONOV-BOHM EFFECT; HALL EFFECT; SPIN

Citation Formats

Kozub, V. I., Zyuzin, A. A., Entin-Wohlman, O., Aharony, A., Galperin, Y. M., Vinokur, V., Materials Science Division, Russian Acad. Sci., Ben Gurion Univ., and Univ. Oslo. Point-contact spectroscopy of hopping transport : efffects of a magnetic field.. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.75.205311.
Kozub, V. I., Zyuzin, A. A., Entin-Wohlman, O., Aharony, A., Galperin, Y. M., Vinokur, V., Materials Science Division, Russian Acad. Sci., Ben Gurion Univ., & Univ. Oslo. Point-contact spectroscopy of hopping transport : efffects of a magnetic field.. United States. doi:10.1103/PhysRevB.75.205311.
Kozub, V. I., Zyuzin, A. A., Entin-Wohlman, O., Aharony, A., Galperin, Y. M., Vinokur, V., Materials Science Division, Russian Acad. Sci., Ben Gurion Univ., and Univ. Oslo. Mon . "Point-contact spectroscopy of hopping transport : efffects of a magnetic field.". United States. doi:10.1103/PhysRevB.75.205311.
@article{osti_948795,
title = {Point-contact spectroscopy of hopping transport : efffects of a magnetic field.},
author = {Kozub, V. I. and Zyuzin, A. A. and Entin-Wohlman, O. and Aharony, A. and Galperin, Y. M. and Vinokur, V. and Materials Science Division and Russian Acad. Sci. and Ben Gurion Univ. and Univ. Oslo},
abstractNote = {The conductance of a point contact between two hopping insulators is expected to be dominated by the individual localized states in its vicinity. Here, we study the additional effects due to an external magnetic field. Combined with the measured conductance, the measured magnetoresistance provides detailed information on these states (e.g., their localization length, the energy difference, and the hopping distance between them). We also calculate the statistics of this magnetoresistance, which can be collected by changing the gate voltage in a single device. Since the conductance is dominated by the quantum interference of particular mesoscopic structures near the point contact, it is predicted to exhibit Aharonov-Bohm oscillations, which yield information on the geometry of these structures. These oscillations also depend on local spin accumulation and correlations, which can be modified by the external field. Finally, we also estimate the mesoscopic Hall voltage due to these structures.},
doi = {10.1103/PhysRevB.75.205311},
journal = {Phys. Rev. B},
number = 20 ; 2007,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}