Giant back-scattering resonances in edge-state transport through quantum dots

J. Bird, M. Stopa, K. Connolly, D. Pivin, D. Ferry

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We consider the origin of striking resonances, observed in the low-temperature magneto-resistance of submicron-sized quantum dots. The magnetic-field positions of the resonances are correlated to the depopulation of Landau levels in the dots, while their amplitude can correspond to a near-complete reflection of the applied current. In order to determine the origin of these features, we formulate a model for edge-state scattering in quantum dots which properly accounts for the magnetic-field-dependent evolution of their self-consistent potential profile. The resonances are thus ascribed to a sudden increase in back scattering, mediated by edge states trapped inside the dot. A similar treatment which ignores the high-field evolution of the dot profile is unable to reproduce the resonances, which we therefore conclude provide an important demonstration of the role of self-consistent effects in mesoscopic systems.

Original languageEnglish (US)
Pages (from-to)7477-7484
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number12
DOIs
StatePublished - Jan 1 1997

Fingerprint

resonance scattering
Semiconductor quantum dots
quantum dots
Scattering
Magnetic fields
Magnetoresistance
profiles
scattering
magnetic fields
Demonstrations
Temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Giant back-scattering resonances in edge-state transport through quantum dots. / Bird, J.; Stopa, M.; Connolly, K.; Pivin, D.; Ferry, D.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 56, No. 12, 01.01.1997, p. 7477-7484.

Research output: Contribution to journalArticle

Bird, J. ; Stopa, M. ; Connolly, K. ; Pivin, D. ; Ferry, D. / Giant back-scattering resonances in edge-state transport through quantum dots. In: Physical Review B - Condensed Matter and Materials Physics. 1997 ; Vol. 56, No. 12. pp. 7477-7484.
@article{8114c1f27c644281a36c1bc3944594a1,
title = "Giant back-scattering resonances in edge-state transport through quantum dots",
abstract = "We consider the origin of striking resonances, observed in the low-temperature magneto-resistance of submicron-sized quantum dots. The magnetic-field positions of the resonances are correlated to the depopulation of Landau levels in the dots, while their amplitude can correspond to a near-complete reflection of the applied current. In order to determine the origin of these features, we formulate a model for edge-state scattering in quantum dots which properly accounts for the magnetic-field-dependent evolution of their self-consistent potential profile. The resonances are thus ascribed to a sudden increase in back scattering, mediated by edge states trapped inside the dot. A similar treatment which ignores the high-field evolution of the dot profile is unable to reproduce the resonances, which we therefore conclude provide an important demonstration of the role of self-consistent effects in mesoscopic systems.",
author = "J. Bird and M. Stopa and K. Connolly and D. Pivin and D. Ferry",
year = "1997",
month = "1",
day = "1",
doi = "10.1103/PhysRevB.56.7477",
language = "English (US)",
volume = "56",
pages = "7477--7484",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
number = "12",

}

TY - JOUR

T1 - Giant back-scattering resonances in edge-state transport through quantum dots

AU - Bird, J.

AU - Stopa, M.

AU - Connolly, K.

AU - Pivin, D.

AU - Ferry, D.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - We consider the origin of striking resonances, observed in the low-temperature magneto-resistance of submicron-sized quantum dots. The magnetic-field positions of the resonances are correlated to the depopulation of Landau levels in the dots, while their amplitude can correspond to a near-complete reflection of the applied current. In order to determine the origin of these features, we formulate a model for edge-state scattering in quantum dots which properly accounts for the magnetic-field-dependent evolution of their self-consistent potential profile. The resonances are thus ascribed to a sudden increase in back scattering, mediated by edge states trapped inside the dot. A similar treatment which ignores the high-field evolution of the dot profile is unable to reproduce the resonances, which we therefore conclude provide an important demonstration of the role of self-consistent effects in mesoscopic systems.

AB - We consider the origin of striking resonances, observed in the low-temperature magneto-resistance of submicron-sized quantum dots. The magnetic-field positions of the resonances are correlated to the depopulation of Landau levels in the dots, while their amplitude can correspond to a near-complete reflection of the applied current. In order to determine the origin of these features, we formulate a model for edge-state scattering in quantum dots which properly accounts for the magnetic-field-dependent evolution of their self-consistent potential profile. The resonances are thus ascribed to a sudden increase in back scattering, mediated by edge states trapped inside the dot. A similar treatment which ignores the high-field evolution of the dot profile is unable to reproduce the resonances, which we therefore conclude provide an important demonstration of the role of self-consistent effects in mesoscopic systems.

UR - http://www.scopus.com/inward/record.url?scp=0000644309&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000644309&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.56.7477

DO - 10.1103/PhysRevB.56.7477

M3 - Article

VL - 56

SP - 7477

EP - 7484

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 12

ER -