Reflection of Ballistic Electrons by Diffusive 2-Dimensional Contacts

A K Geim; P C Main; R Taboryski; H Carmona; C V Brown; T J Foster; R B S Oakeshott; E Veje

Reflection of Ballistic Electrons by Diffusive 2-Dimensional Contacts

A K Geim, P C Main, R Taboryski, H Carmona, C V Brown, T J Foster, R B S Oakeshott, E Veje

Research output: Contribution to journal › Article › peer-review

Abstract

We report quenching of high-magnetic-field Shubnikov-de Haas oscillations and shrinking of the Hall plateaux with decreasing temperature in a quantum Hall effect conductor with low-mobility contact leads. Selective He-ion bombardment has been employed to reduce the mobility of a two-dimensional electron gas in the contacts. We explain the results in terms of the Milne reflection of the electrons from these disordered regions. At sufficiently low temperatures, inelastic scattering is suppressed and electrons are scattered back by elastic collisions before thermalisation can occur.

Original language	English
Pages (from-to)	1005-1009
Number of pages	5
Journal	Solid-state electronics
Volume	37
Issue number	4-6
Publication status	Published - 1994

Keywords

high magnetic-fields
quantum transport
heterostructures
conductors
scattering
regime

Cite this

@article{37809334118e4877943f6331d45ee032,

title = "Reflection of Ballistic Electrons by Diffusive 2-Dimensional Contacts",

abstract = "We report quenching of high-magnetic-field Shubnikov-de Haas oscillations and shrinking of the Hall plateaux with decreasing temperature in a quantum Hall effect conductor with low-mobility contact leads. Selective He-ion bombardment has been employed to reduce the mobility of a two-dimensional electron gas in the contacts. We explain the results in terms of the Milne reflection of the electrons from these disordered regions. At sufficiently low temperatures, inelastic scattering is suppressed and electrons are scattered back by elastic collisions before thermalisation can occur.",

keywords = "high magnetic-fields, quantum transport, heterostructures, conductors, scattering, regime",

author = "Geim, {A K} and Main, {P C} and R Taboryski and H Carmona and Brown, {C V} and Foster, {T J} and Oakeshott, {R B S} and E Veje",

note = "Ne796 Times Cited:2 Cited References Count:22",

year = "1994",

language = "English",

volume = "37",

pages = "1005--1009",

journal = "Solid-state electronics",

issn = "0038-1101",

publisher = "Elsevier BV",

number = "4-6",

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TY - JOUR

T1 - Reflection of Ballistic Electrons by Diffusive 2-Dimensional Contacts

AU - Geim, A K

AU - Main, P C

AU - Taboryski, R

AU - Carmona, H

AU - Brown, C V

AU - Foster, T J

AU - Oakeshott, R B S

AU - Veje, E

N1 - Ne796 Times Cited:2 Cited References Count:22

PY - 1994

Y1 - 1994

N2 - We report quenching of high-magnetic-field Shubnikov-de Haas oscillations and shrinking of the Hall plateaux with decreasing temperature in a quantum Hall effect conductor with low-mobility contact leads. Selective He-ion bombardment has been employed to reduce the mobility of a two-dimensional electron gas in the contacts. We explain the results in terms of the Milne reflection of the electrons from these disordered regions. At sufficiently low temperatures, inelastic scattering is suppressed and electrons are scattered back by elastic collisions before thermalisation can occur.

AB - We report quenching of high-magnetic-field Shubnikov-de Haas oscillations and shrinking of the Hall plateaux with decreasing temperature in a quantum Hall effect conductor with low-mobility contact leads. Selective He-ion bombardment has been employed to reduce the mobility of a two-dimensional electron gas in the contacts. We explain the results in terms of the Milne reflection of the electrons from these disordered regions. At sufficiently low temperatures, inelastic scattering is suppressed and electrons are scattered back by elastic collisions before thermalisation can occur.

KW - high magnetic-fields

KW - quantum transport

KW - heterostructures

KW - conductors

KW - scattering

KW - regime

M3 - Article

SN - 0038-1101

VL - 37

SP - 1005

EP - 1009

JO - Solid-state electronics

JF - Solid-state electronics

IS - 4-6

ER -

Reflection of Ballistic Electrons by Diffusive 2-Dimensional Contacts

Abstract

Keywords

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