Novel features of quantum conduction in a constriction

Date

1989

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Source Title

Physical Review B

Print ISSN

0163-1829

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Publisher

American Physical Society

Volume

39

Issue

12

Pages

8772 - 8775

Language

English

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Abstract

The effects of the geometry and temperature on the quantum conductance for one-dimensional (1D) ballistic transport through a constriction in a 2D electron gas are investigated by use of a refined formalism. As the length of the constriction increases, weak oscillations around the classical conductance evolve into a steplike structure and the resonances on the plateaus become pronounced. Quantization at integer multiples of 2e2/h occurs only for uniform constriction of finite length. At finite temperature of 0.6 K significantly long uniform constriction is necessary to observe plateaus devoid of resonance structure. © 1989 The American Physical Society.

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