Fano Resonance in Transport Through Double Quantum Dot in Parallel

Yujie Zhang, Mikio Eto

Research output: Contribution to journalArticle

Abstract

The transport properties of double quantum dot (DQD) in parallel are theoretically examined. This system simulates a mesoscopic ring with an embedded quantum dot, so-called Aharonov–Bohm (AB) interferometer, by enlarging the line width in one of the quantum dots. We find that: 1) the Coulomb peak shows an asymmetric shape of Fano resonance when the DQD is coupled to external leads with single conduction channel; 2) the peak becomes more symmetric for the leads with multiple channels; and 3) the resonant shape is characterized by a single parameter which is determined by the structure of the leads. Our theory may explain the experimental results on the transport through the AB interferometer; an asymmetric Fano resonance was observed by one group while a symmetric Breit–Wigner resonance was observed by the other groups.

Original languageEnglish
JournalPhysica Status Solidi (B) Basic Research
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

Semiconductor quantum dots
quantum dots
Interferometers
interferometers
Linewidth
Transport properties
transport properties
conduction
expansion
rings

Keywords

  • Aharonov–Bohm effect
  • Fano resonance
  • interference
  • mesoscopic systems
  • quantum dots

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Fano Resonance in Transport Through Double Quantum Dot in Parallel. / Zhang, Yujie; Eto, Mikio.

In: Physica Status Solidi (B) Basic Research, 01.01.2019.

Research output: Contribution to journalArticle

@article{b3d62934181d4480a2e35263c41aa279,
title = "Fano Resonance in Transport Through Double Quantum Dot in Parallel",
abstract = "The transport properties of double quantum dot (DQD) in parallel are theoretically examined. This system simulates a mesoscopic ring with an embedded quantum dot, so-called Aharonov–Bohm (AB) interferometer, by enlarging the line width in one of the quantum dots. We find that: 1) the Coulomb peak shows an asymmetric shape of Fano resonance when the DQD is coupled to external leads with single conduction channel; 2) the peak becomes more symmetric for the leads with multiple channels; and 3) the resonant shape is characterized by a single parameter which is determined by the structure of the leads. Our theory may explain the experimental results on the transport through the AB interferometer; an asymmetric Fano resonance was observed by one group while a symmetric Breit–Wigner resonance was observed by the other groups.",
keywords = "Aharonov–Bohm effect, Fano resonance, interference, mesoscopic systems, quantum dots",
author = "Yujie Zhang and Mikio Eto",
year = "2019",
month = "1",
day = "1",
doi = "10.1002/pssb.201800526",
language = "English",
journal = "Physica Status Solidi (B): Basic Research",
issn = "0370-1972",
publisher = "Wiley-VCH Verlag",

}

TY - JOUR

T1 - Fano Resonance in Transport Through Double Quantum Dot in Parallel

AU - Zhang, Yujie

AU - Eto, Mikio

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The transport properties of double quantum dot (DQD) in parallel are theoretically examined. This system simulates a mesoscopic ring with an embedded quantum dot, so-called Aharonov–Bohm (AB) interferometer, by enlarging the line width in one of the quantum dots. We find that: 1) the Coulomb peak shows an asymmetric shape of Fano resonance when the DQD is coupled to external leads with single conduction channel; 2) the peak becomes more symmetric for the leads with multiple channels; and 3) the resonant shape is characterized by a single parameter which is determined by the structure of the leads. Our theory may explain the experimental results on the transport through the AB interferometer; an asymmetric Fano resonance was observed by one group while a symmetric Breit–Wigner resonance was observed by the other groups.

AB - The transport properties of double quantum dot (DQD) in parallel are theoretically examined. This system simulates a mesoscopic ring with an embedded quantum dot, so-called Aharonov–Bohm (AB) interferometer, by enlarging the line width in one of the quantum dots. We find that: 1) the Coulomb peak shows an asymmetric shape of Fano resonance when the DQD is coupled to external leads with single conduction channel; 2) the peak becomes more symmetric for the leads with multiple channels; and 3) the resonant shape is characterized by a single parameter which is determined by the structure of the leads. Our theory may explain the experimental results on the transport through the AB interferometer; an asymmetric Fano resonance was observed by one group while a symmetric Breit–Wigner resonance was observed by the other groups.

KW - Aharonov–Bohm effect

KW - Fano resonance

KW - interference

KW - mesoscopic systems

KW - quantum dots

UR - http://www.scopus.com/inward/record.url?scp=85062998829&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062998829&partnerID=8YFLogxK

U2 - 10.1002/pssb.201800526

DO - 10.1002/pssb.201800526

M3 - Article

JO - Physica Status Solidi (B): Basic Research

JF - Physica Status Solidi (B): Basic Research

SN - 0370-1972

ER -