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Title: Tunable current circulation in triangular quantum-dot metastructures

Abstract

Advances in fabrication and control of quantum dots allow the realization of metastructures that may exhibit novel electrical transport phenomena. In this work, we investigate the electrical current passing through one such metastructure, a system composed of quantum dots placed at the vertices of a triangle. The wave nature of quantum particles leads to internal current circulation within the metastructure in the absence of any external magnetic field. We uncover the relation between the metastructure steady-state total current and the internal circulation. By calculating the electronic correlations in quantum transport exactly, we present phase diagrams showing where different types of current circulation can be found as a function of the correlation strength and the coupling between the quantum dots. Finally, we show that the regimes of current circulation can be further enhanced or reduced depending on the local spatial distribution of the interactions, suggesting a single-particle scattering mechanism is at play even in the strongly correlated regime. We suggest experimental realizations of actual quantum-dot metastructures where our predictions can be directly tested.

Authors:
ORCiD logo [1];  [2];  [3];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of California, San Diego, CA (United States). Dept. of Physics
  3. Univ. of California, Merced, CA (United States). School of Natural Sciences
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; Defense Threat Reduction Agency (DTRA); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)
OSTI Identifier:
1473813
Report Number(s):
LA-UR-18-20615
Journal ID: ISSN 1286-4854
Grant/Contract Number:  
AC52-06NA25396; HDTRA1-15-1-0011; FA9550-16-1-0278; ACI-1429783
Resource Type:
Accepted Manuscript
Journal Name:
Europhysics Letters (Online)
Additional Journal Information:
Journal Name: Europhysics Letters (Online); Journal Volume: 123; Journal Issue: 4; Journal ID: ISSN 1286-4854
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Material Science

Citation Formats

Lai, Chen-Yen, Di Ventra, Massimiliano, Scheibner, Michael, and Chien, Chih-Chun. Tunable current circulation in triangular quantum-dot metastructures. United States: N. p., 2018. Web. doi:10.1209/0295-5075/123/47002.
Lai, Chen-Yen, Di Ventra, Massimiliano, Scheibner, Michael, & Chien, Chih-Chun. Tunable current circulation in triangular quantum-dot metastructures. United States. doi:10.1209/0295-5075/123/47002.
Lai, Chen-Yen, Di Ventra, Massimiliano, Scheibner, Michael, and Chien, Chih-Chun. Tue . "Tunable current circulation in triangular quantum-dot metastructures". United States. doi:10.1209/0295-5075/123/47002. https://www.osti.gov/servlets/purl/1473813.
@article{osti_1473813,
title = {Tunable current circulation in triangular quantum-dot metastructures},
author = {Lai, Chen-Yen and Di Ventra, Massimiliano and Scheibner, Michael and Chien, Chih-Chun},
abstractNote = {Advances in fabrication and control of quantum dots allow the realization of metastructures that may exhibit novel electrical transport phenomena. In this work, we investigate the electrical current passing through one such metastructure, a system composed of quantum dots placed at the vertices of a triangle. The wave nature of quantum particles leads to internal current circulation within the metastructure in the absence of any external magnetic field. We uncover the relation between the metastructure steady-state total current and the internal circulation. By calculating the electronic correlations in quantum transport exactly, we present phase diagrams showing where different types of current circulation can be found as a function of the correlation strength and the coupling between the quantum dots. Finally, we show that the regimes of current circulation can be further enhanced or reduced depending on the local spatial distribution of the interactions, suggesting a single-particle scattering mechanism is at play even in the strongly correlated regime. We suggest experimental realizations of actual quantum-dot metastructures where our predictions can be directly tested.},
doi = {10.1209/0295-5075/123/47002},
journal = {Europhysics Letters (Online)},
number = 4,
volume = 123,
place = {United States},
year = {2018},
month = {9}
}

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Cited by: 2 works
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