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Title: Detecting Weak Coupling of Quantum Systems with a Nonequilibrium Fano Resonance

Abstract

A critical aspect of quantum mechanics is the nonlocal nature of the wavefunction, a characteristic that may yield unexpected coupling of nominally-isolated systems. The capacity to detect this coupling can be vital in many situations, especially those in which its strength is weak. In this work we address this problem in the context of mesoscopic physics, by implementing an electron-wave realization of a Fano interferometer using pairs of coupled quantum point contacts (QPCs). Within this scheme, the discrete level required for a Fano resonance is provided by pinching off one of the QPCs, thereby inducing the formation of a quasi-bound state at the center of its self-consistent potential barrier. Using this system, we demonstrate a form of $$\textit{nonequilibrium}$$ Fano resonance (NEFR), in which nonlinear electrical biasing of the interferometer gives rise to pronounced distortions of its Fano resonance. Our experimental results are captured well by a quantitative theoretical model, which considers a system in which a standard two-path Fano interferometer is coupled to an additional, $$\textit{intruder}$$, continuum. According to this theory, the observed distortions in the Fano resonance arise $$\textit{only}$$ in the presence of coupling to the intruder, indicating that the NEFR provides a sensitive means to infer the presence of weak coupling between mesoscopic systems.

Authors:
 [1];  [1];  [1];  [2];  [3];  [3];  [4];  [5]
  1. Univ. at Buffalo, the State Univ. of New York, Buffalo, NY (United States)
  2. Univ. at Buffalo, the State Univ. of New York, Buffalo, NY (United States); Chiba Univ., Chiba (Japan)
  3. Chiba Univ., Chiba (Japan)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  5. Uppsala Univ., Uppsala (Sweden)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1512879
Alternate Identifier(s):
OSTI ID: 1249724
Report Number(s):
SAND-2015-9047J
Journal ID: ISSN 2469-9950; PRBMDO; 664884
Grant/Contract Number:  
AC04-94AL85000; FG02-04ER46180
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Xiao, S., Yoon, Y., Lee, Y. -H., Bird, J. P., Ochiai, Y., Aoki, N., Reno, John L., and Fraansson, J. Detecting Weak Coupling of Quantum Systems with a Nonequilibrium Fano Resonance. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.165435.
Xiao, S., Yoon, Y., Lee, Y. -H., Bird, J. P., Ochiai, Y., Aoki, N., Reno, John L., & Fraansson, J. Detecting Weak Coupling of Quantum Systems with a Nonequilibrium Fano Resonance. United States. doi:10.1103/PhysRevB.93.165435.
Xiao, S., Yoon, Y., Lee, Y. -H., Bird, J. P., Ochiai, Y., Aoki, N., Reno, John L., and Fraansson, J. Mon . "Detecting Weak Coupling of Quantum Systems with a Nonequilibrium Fano Resonance". United States. doi:10.1103/PhysRevB.93.165435. https://www.osti.gov/servlets/purl/1512879.
@article{osti_1512879,
title = {Detecting Weak Coupling of Quantum Systems with a Nonequilibrium Fano Resonance},
author = {Xiao, S. and Yoon, Y. and Lee, Y. -H. and Bird, J. P. and Ochiai, Y. and Aoki, N. and Reno, John L. and Fraansson, J.},
abstractNote = {A critical aspect of quantum mechanics is the nonlocal nature of the wavefunction, a characteristic that may yield unexpected coupling of nominally-isolated systems. The capacity to detect this coupling can be vital in many situations, especially those in which its strength is weak. In this work we address this problem in the context of mesoscopic physics, by implementing an electron-wave realization of a Fano interferometer using pairs of coupled quantum point contacts (QPCs). Within this scheme, the discrete level required for a Fano resonance is provided by pinching off one of the QPCs, thereby inducing the formation of a quasi-bound state at the center of its self-consistent potential barrier. Using this system, we demonstrate a form of $\textit{nonequilibrium}$ Fano resonance (NEFR), in which nonlinear electrical biasing of the interferometer gives rise to pronounced distortions of its Fano resonance. Our experimental results are captured well by a quantitative theoretical model, which considers a system in which a standard two-path Fano interferometer is coupled to an additional, $\textit{intruder}$, continuum. According to this theory, the observed distortions in the Fano resonance arise $\textit{only}$ in the presence of coupling to the intruder, indicating that the NEFR provides a sensitive means to infer the presence of weak coupling between mesoscopic systems.},
doi = {10.1103/PhysRevB.93.165435},
journal = {Physical Review B},
number = 16,
volume = 93,
place = {United States},
year = {2016},
month = {4}
}

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