Commensurability oscillations due to pinned and drifting orbits in a two-dimensional lateral surface superlattice

被引:33
作者
Grant, DE
Long, AR
Davies, JH [1 ]
机构
[1] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
[2] Univ Glasgow, Dept Elect & Elect Engn, Glasgow G12 8QQ, Lanark, Scotland
来源
PHYSICAL REVIEW B | 2000年 / 61卷 / 19期
关键词
D O I
10.1103/PhysRevB.61.13127
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have simulated conduction in a two-dimensional electron gas subject to a weak two-dimensional periodic potential V(x)cos(2 pi x/a) + V(y)cos(2 pi y/a). The usual commensurability oscillations in p(xx)(B) are seen with V-x alone. An increase of V-y supresses these oscillations, rather than introducing the additional oscillations in p(yy)(B) expected from previous perturbation theories. We show that this behavior arises from drift of the guiding center of cyclotron motion along contours of an effective potential. Periodic modulation in the magnetic field can be treated in the same way.
引用
收藏
页码:13127 / 13130
页数:4
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