Novel structures near nu=9/2 in short-period unidirectional lateral superlattices

Endo, A Iye, Y

A. Endo et Y. Iye, Novel structures near nu=9/2 in short-period unidirectional lateral superlattices, SOL ST COMM, 117(4), 2001, pp. 249-254

28

INGLESE

Article

Apllied Physucs/Condensed Matter/Materiales Science

SOLID STATE COMMUNICATIONS

0038-1098 → ACNP

117

4

2001

249 - 254

ISI

0038-1098(2001)117:4<249:NSNNIS>2.0.ZU;2-3

Unidirectional lateral superlattices with a period a = 92 nm fabricated fro m two-dimensional electron gas (2DEG) with mobility mu = 76 m(2)/V s show n ovel structures around v = 9/2 at low temperatures (50 mK less than or equa l to T less than or equal to 350 mK). A shallow and broad dent with peaks o n both sides appears when the direction of current is parallel to the direc tion of potential modulation, while a small peak emerges for the current di rection parallel to the stripes of the grating. The observed phenomena rese mble, albeit much smaller in magnitude, the anisotropic resistivity at half -filling of higher Landau levels recently observed in the plain 2DEGs with ultrahigh mobility and may be associated with the formation of charge densi ty wave (CDW). (C) 2001 Elsevier Science Ltd. All rights reserved.