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Title: Giant Zero Bias Anomaly due to Coherent Scattering from Frozen Phonon Disorder in Quantum Point Contacts

Abstract

Here demonstrate an unusual manifestation of coherent scattering for electron waves in mesoscopic quantum point contacts, in which fast electron dynamics allows the phonon system to serve as a quasistatic source of disorder. The low-temperature conductance of these devices exhibits a giant ($$\gg2e^2/h$$) zero bias anomaly (ZBA), the features of which are reproduced in a nonequilibrium model for coherent scattering from the “frozen” phonon disorder. According to this model, the ZBA is understood to result from the in situ electrical manipulation of the phonon disorder, a mechanism that could open up a pathway to the on-demand control of coherent scattering in the solid state.

Authors:
 [1];  [1];  [2];  [3];  [1];  [1]
+ Show Author Affiliations
  1. Univ. at Buffalo, NY (United States)
  2. Inst. for Basic Science, Daejeon (Korea, Republic of)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
State Univ. of New York (SUNY), Buffalo, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1593525
Alternate Identifier(s):
OSTI ID: 1545952
Grant/Contract Number:  
FG02-04ER46180
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 5; Related Information: https://journals-aps-org.gate.lib.buffalo.edu/prl/supplemental/10.1103/PhysRevLett.123.056802/suppl.pdf; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; mesoscopics; quantum interference; electrical conductivity; localization; quantum interference effects; quantum transport

Citation Formats

Lee, Y. -H., Xiao, S., Kim, K.  W., Reno, J.  L., Bird, J.  P., and Han, J.  E. Giant Zero Bias Anomaly due to Coherent Scattering from Frozen Phonon Disorder in Quantum Point Contacts. United States: N. p., 2019. Web. doi:10.1103/physrevlett.123.056802.
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Lee, Y. -H., Xiao, S., Kim, K.  W., Reno, J.  L., Bird, J.  P., & Han, J.  E. Giant Zero Bias Anomaly due to Coherent Scattering from Frozen Phonon Disorder in Quantum Point Contacts. United States. https://doi.org/10.1103/physrevlett.123.056802
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Lee, Y. -H., Xiao, S., Kim, K.  W., Reno, J.  L., Bird, J.  P., and Han, J.  E. Tue . "Giant Zero Bias Anomaly due to Coherent Scattering from Frozen Phonon Disorder in Quantum Point Contacts". United States. https://doi.org/10.1103/physrevlett.123.056802. https://www.osti.gov/servlets/purl/1593525.
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@article{osti_1593525,
title = {Giant Zero Bias Anomaly due to Coherent Scattering from Frozen Phonon Disorder in Quantum Point Contacts},
author = {Lee, Y. -H. and Xiao, S. and Kim, K.  W. and Reno, J.  L. and Bird, J.  P. and Han, J.  E.},
abstractNote = {Here demonstrate an unusual manifestation of coherent scattering for electron waves in mesoscopic quantum point contacts, in which fast electron dynamics allows the phonon system to serve as a quasistatic source of disorder. The low-temperature conductance of these devices exhibits a giant ($\gg2e^2/h$) zero bias anomaly (ZBA), the features of which are reproduced in a nonequilibrium model for coherent scattering from the “frozen” phonon disorder. According to this model, the ZBA is understood to result from the in situ electrical manipulation of the phonon disorder, a mechanism that could open up a pathway to the on-demand control of coherent scattering in the solid state.},
doi = {10.1103/physrevlett.123.056802},
journal = {Physical Review Letters},
number = 5,
volume = 123,
place = {United States},
year = {Tue Jul 30 00:00:00 EDT 2019},
month = {Tue Jul 30 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/physrevlett.123.056802
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Figures / Tables:

FIG. 1 FIG. 1: (a) Differential conductance of a QPC with asymmetric gate geometry at 4.2 K. Gate voltage is varied in 20-mV increments from −1.82 V (top) to −2.36 V (bottom). The left insets are scanning-electron micrographs of symmetric (top) and asymmetric QPCs. The right inset shows the quantized conductance inmore » a typical QPC at 20 mK. (b) Schematic representation of three different frozen-phonon realizations (labeled in figure). These “snapshots” of the lattice vibration schematically denote the instantaneous displacement of GaAs atoms from their equilibrium positions. (c) Contour plots showing the variation of differential conductance for an asymmetric (left panel) and asymmetric (right panel) QPC.« less
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