The Aharonov-Bohm effect in electrostatically defined heterojunction rings

C. J B Ford, Trevor Thornton, R. Newbury, M. Pepper, H. Ahmed, C. T. Foxon, J. J. Harris, C. Roberts

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Micrometer-sized loops of two-dimensional electron gas have been made on GaAs-AlGaAs heterostructures by electrostatic confinement. A split gate is used to define the loop, allowing the width of the conducting channels to be varied by changing the gate voltage. The magnetoresistance has been measured at low temperatures (T < 100 mK) and shows strong Aharonov-Bohm oscillations with amplitudes of up to 7% of the total resistance in the narrowest devices. The oscillations are strong out to B ≃ 0.5 T and then die out as B increases to ≃ 1 T, with a possible dependence on the channel width. Magnetic depopulation of the ID-sub-bands is also seen.

Original languageEnglish (US)
JournalJournal of Physics C: Solid State Physics
Volume21
Issue number10
DOIs
StatePublished - Apr 10 1988
Externally publishedYes

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Two dimensional electron gas
Magnetoresistance
Heterojunctions
heterojunctions
Electrostatics
oscillations
rings
Electric potential
aluminum gallium arsenides
electron gas
micrometers
electrostatics
conduction
Temperature
electric potential
gallium arsenide

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics

Cite this

The Aharonov-Bohm effect in electrostatically defined heterojunction rings. / Ford, C. J B; Thornton, Trevor; Newbury, R.; Pepper, M.; Ahmed, H.; Foxon, C. T.; Harris, J. J.; Roberts, C.

In: Journal of Physics C: Solid State Physics, Vol. 21, No. 10, 10.04.1988.

Research output: Contribution to journalArticle

Ford, C. J B ; Thornton, Trevor ; Newbury, R. ; Pepper, M. ; Ahmed, H. ; Foxon, C. T. ; Harris, J. J. ; Roberts, C. / The Aharonov-Bohm effect in electrostatically defined heterojunction rings. In: Journal of Physics C: Solid State Physics. 1988 ; Vol. 21, No. 10.
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