ENHANCEMENT OF SHUBNIKOV-DEHAAS OSCILLATIONS BY CARRIER MODULATION

被引：12

作者：

SCHACHAM, SE

HAUGLAND, EJ

ALTEROVITZ, SA

机构：

[1] NASA Lewis Research Center, M/S 54-5, Cleveland

来源：

APPLIED PHYSICS LETTERS | 1992年 / 61卷 / 05期

关键词：

D O I：

10.1063/1.107859

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A drastic enhancement of the Shubnikov-de Haas (SdH) pattern is obtained by recording the changes in the quantum oscillations of magnetoresistance due to modulation of the carrier concentration. The technique enables measurement of the SdH waveform at relatively high temperatures and in samples with moderate mobilities. The modulated waveform shows selective enhancement of the low-frequency SdH oscillations associated with the upper subband. Thus, we were able to record very clear oscillations generated by a carrier concentration well below 5 X 10(10) cm-2. The theory for this selective enhancement is provided.

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页码：551 / 553

页数：3

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