Zero Field Magnetoresistance Peaks in Open Quantum Dots: Weak Localization or a Fundamental Property?

Richard Akis; Dragica Vasileska; David K. Ferry; Jonathan P. Bird

doi:10.1143/JJAP.38.328

Zero Field Magnetoresistance Peaks in Open Quantum Dots: Weak Localization or a Fundamental Property?

Richard Akis
, Dragica Vasileska
, David K. Ferry
, Jonathan P. Bird

Department of Electrical Engineering

Arizona State University

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

Abstract

We have performed numerical simulations of the magnetotransport of open quantum dots with contacts supporting several modes. We reproduce the zero field resistance peaks seen in experiments performed on such structures, a phenomenon previously attributed to weak localization. Our results, however, indicate that these peaks can have an entirely different origin, involving the zero field crossings of conductance resonance lines that reflect the underlying dot spectrum. Even with significant ensemble averaging. the nature of these crossings largely determines the shape and width of the resistance peaks.

Original language	English
Pages (from-to)	328-331
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	38
Issue number	1 B
DOIs	https://doi.org/10.1143/JJAP.38.328
State	Published - 1999
Event	Proceedings of the 1998 International Symposium on Formation, Physics and Device Application of Quantum Dot Structures, QDS-98 - Sapporo, Japan Duration: May 31 1998 → Jun 4 1998

Keywords

Magnetotransport
Numerical simulation
Poisson equation
Quantum dots
Weak localization

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10.1143/JJAP.38.328

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@article{2939a964fdfd4a46bca46420fadd3340,

title = "Zero Field Magnetoresistance Peaks in Open Quantum Dots: Weak Localization or a Fundamental Property?",

abstract = "We have performed numerical simulations of the magnetotransport of open quantum dots with contacts supporting several modes. We reproduce the zero field resistance peaks seen in experiments performed on such structures, a phenomenon previously attributed to weak localization. Our results, however, indicate that these peaks can have an entirely different origin, involving the zero field crossings of conductance resonance lines that reflect the underlying dot spectrum. Even with significant ensemble averaging. the nature of these crossings largely determines the shape and width of the resistance peaks.",

keywords = "Magnetotransport, Numerical simulation, Poisson equation, Quantum dots, Weak localization",

author = "Richard Akis and Dragica Vasileska and Ferry, \{David K.\} and Bird, \{Jonathan P.\}",

year = "1999",

doi = "10.1143/JJAP.38.328",

language = "English",

volume = "38",

pages = "328--331",

journal = "Japanese Journal of Applied Physics, Part 2: Letters",

issn = "0021-4922",

publisher = "Institute of Physics",

number = "1 B",

note = "Proceedings of the 1998 International Symposium on Formation, Physics and Device Application of Quantum Dot Structures, QDS-98 ; Conference date: 31-05-1998 Through 04-06-1998",

}

TY - JOUR

T1 - Zero Field Magnetoresistance Peaks in Open Quantum Dots

T2 - Proceedings of the 1998 International Symposium on Formation, Physics and Device Application of Quantum Dot Structures, QDS-98

AU - Akis, Richard

AU - Vasileska, Dragica

AU - Ferry, David K.

AU - Bird, Jonathan P.

PY - 1999

Y1 - 1999

N2 - We have performed numerical simulations of the magnetotransport of open quantum dots with contacts supporting several modes. We reproduce the zero field resistance peaks seen in experiments performed on such structures, a phenomenon previously attributed to weak localization. Our results, however, indicate that these peaks can have an entirely different origin, involving the zero field crossings of conductance resonance lines that reflect the underlying dot spectrum. Even with significant ensemble averaging. the nature of these crossings largely determines the shape and width of the resistance peaks.

AB - We have performed numerical simulations of the magnetotransport of open quantum dots with contacts supporting several modes. We reproduce the zero field resistance peaks seen in experiments performed on such structures, a phenomenon previously attributed to weak localization. Our results, however, indicate that these peaks can have an entirely different origin, involving the zero field crossings of conductance resonance lines that reflect the underlying dot spectrum. Even with significant ensemble averaging. the nature of these crossings largely determines the shape and width of the resistance peaks.

KW - Magnetotransport

KW - Numerical simulation

KW - Poisson equation

KW - Quantum dots

KW - Weak localization

UR - https://www.scopus.com/pages/publications/0032607968

U2 - 10.1143/JJAP.38.328

DO - 10.1143/JJAP.38.328

M3 - Conference article

AN - SCOPUS:0032607968

SN - 0021-4922

VL - 38

SP - 328

EP - 331

JO - Japanese Journal of Applied Physics, Part 2: Letters

JF - Japanese Journal of Applied Physics, Part 2: Letters

IS - 1 B

Y2 - 31 May 1998 through 4 June 1998

ER -

Zero Field Magnetoresistance Peaks in Open Quantum Dots: Weak Localization or a Fundamental Property?

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Keywords

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