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Semiclassical transport in nearly symmetric quantum dots. II. Symmetry breaking due to asymmetric leads

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Semiclassical transport in nearly symmetric quantum dots. II. Symmetry breaking due to asymmetric leads. / Whitney, Robert S.; Schomerus, Henning; Kopp, Marten.
In: Physical Review E, Vol. 80, No. 5, 11.2009, p. 056210.

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Whitney RS, Schomerus H, Kopp M. Semiclassical transport in nearly symmetric quantum dots. II. Symmetry breaking due to asymmetric leads. Physical Review E. 2009 Nov;80(5):056210. doi: 10.1103/PhysRevE.80.056210

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Whitney, Robert S. ; Schomerus, Henning ; Kopp, Marten. / Semiclassical transport in nearly symmetric quantum dots. II. Symmetry breaking due to asymmetric leads. In: Physical Review E. 2009 ; Vol. 80, No. 5. pp. 056210.

Bibtex

@article{bd3c898ffb564203ba432fb0f94f96d3,
title = "Semiclassical transport in nearly symmetric quantum dots. II. Symmetry breaking due to asymmetric leads",
abstract = "In this work—the second of a pair of articles—we consider transport through spatially symmetric quantum dots with leads whose widths or positions do not obey the spatial symmetry. We use the semiclassical theory of transport to find the symmetry-induced contributions to weak localization corrections and universal conductance fluctuations for dots with left-right, up-down, inversion, and fourfold symmetries. We show that all these contributions are suppressed by asymmetric leads; however, they remain finite whenever leads intersect with their images under the symmetry operation. For an up-down symmetric dot, this means that the contributions can be finite even if one of the leads is completely asymmetric. We find that the suppression of the contributions to universal conductance fluctuations is the square of the suppression of contributions to weak localization. Finally, we develop a random-matrix theory model which enables us to numerically confirm these results.",
author = "Whitney, {Robert S.} and Henning Schomerus and Marten Kopp",
year = "2009",
month = nov,
doi = "10.1103/PhysRevE.80.056210",
language = "English",
volume = "80",
pages = "056210",
journal = "Physical Review E",
issn = "1539-3755",
publisher = "American Physical Society",
number = "5",

}

RIS

TY - JOUR

T1 - Semiclassical transport in nearly symmetric quantum dots. II. Symmetry breaking due to asymmetric leads

AU - Whitney, Robert S.

AU - Schomerus, Henning

AU - Kopp, Marten

PY - 2009/11

Y1 - 2009/11

N2 - In this work—the second of a pair of articles—we consider transport through spatially symmetric quantum dots with leads whose widths or positions do not obey the spatial symmetry. We use the semiclassical theory of transport to find the symmetry-induced contributions to weak localization corrections and universal conductance fluctuations for dots with left-right, up-down, inversion, and fourfold symmetries. We show that all these contributions are suppressed by asymmetric leads; however, they remain finite whenever leads intersect with their images under the symmetry operation. For an up-down symmetric dot, this means that the contributions can be finite even if one of the leads is completely asymmetric. We find that the suppression of the contributions to universal conductance fluctuations is the square of the suppression of contributions to weak localization. Finally, we develop a random-matrix theory model which enables us to numerically confirm these results.

AB - In this work—the second of a pair of articles—we consider transport through spatially symmetric quantum dots with leads whose widths or positions do not obey the spatial symmetry. We use the semiclassical theory of transport to find the symmetry-induced contributions to weak localization corrections and universal conductance fluctuations for dots with left-right, up-down, inversion, and fourfold symmetries. We show that all these contributions are suppressed by asymmetric leads; however, they remain finite whenever leads intersect with their images under the symmetry operation. For an up-down symmetric dot, this means that the contributions can be finite even if one of the leads is completely asymmetric. We find that the suppression of the contributions to universal conductance fluctuations is the square of the suppression of contributions to weak localization. Finally, we develop a random-matrix theory model which enables us to numerically confirm these results.

U2 - 10.1103/PhysRevE.80.056210

DO - 10.1103/PhysRevE.80.056210

M3 - Journal article

VL - 80

SP - 056210

JO - Physical Review E

JF - Physical Review E

SN - 1539-3755

IS - 5

ER -