CONDUCTANCE-QUANTIZATION BROADENING MECHANISMS IN QUANTUM POINT CONTACTS

被引：19

作者：

TABORYSKI, R ^{[1
]}

KRISTENSEN, A ^{[1
]}

SORENSEN, CB ^{[1
]}

LINDELOF, PE ^{[1
]}

机构：

[1] UNIV COPENHAGEN,NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.51.2282

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied three types of broadening effects in quantum point contacts: temperature smearing, broadening due to high source-drain voltages, and broadening due to Joule heating. We are able to calculate the relative strength of the three mechanisms by using the parabolic-saddle-potential approximation. The voltage smearing effect can in most cases be disregarded in comparison with the thermal effects. The Joule heat produced in the constriction by the current is carried away by a thermal conductance intermediate between the low conductance of the quantum point contact and the high conductance of the surrounding two-dimensional electron gas, indicating which part of the dissipation results from the one-dimensional modes in the constriction. © 1995 The American Physical Society.

引用

页码：2282 / 2286

页数：5

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