Even-denominator filling factors in the thermoelectric power of a two-dimensional electron gas

被引:36
作者
Tieke, B
Zeitler, U
Fletcher, R
Wiegers, SAJ
Geim, AK
Maan, JC
Henini, M
机构
[1] QUEENS UNIV,DEPT PHYS,KINGSTON,ON K7L 3N6,CANADA
[2] UNIV NOTTINGHAM,DEPT PHYS,NOTTINGHAM NG7 2RD,ENGLAND
关键词
D O I
10.1103/PhysRevLett.76.3630
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We have investigated the interaction of phonons with a two-dimensional electron gas in the fractional quantum Hall regime with phonon drag thermoelectric power (TEP). The TEPs at filling factors with the same even denominator are found to be identical; at other even-denominator filling factors they differ only by a constant factor. Treating these states as composite fermions, the findings are explained by a zero magnetic field theory for phonon drag. A maximum observed in the TEP at nu = 1/2 is modeled by a weakly diverging effective mass of the composite fermions at this filling factor.
引用
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页码:3630 / 3633
页数:4
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