Periodic Density Modulation Effects on a Correlated two-dimensional Composite Fermion System

Details Periodic Density Modulation Effects on a Correlated two-dimensional Composite Fermion System Periodic Density Modulation Effects on a Correlated two-dimensional Composite Fermion System

2001-03-20

arxiv.org/abs/cond-mat/0103412v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages and 1 figure

Scientific paper

10.1103/PhysRevB.64.113101

We examine theoretically the effects caused by a periodic external potential on the correlated motion of a two-dimensional electron system under strong magnetic fields corresponding to a filling factor 1/2. To describe the resulting complex dynamics, we adopt a composite fermion approach and we determine in a two loop approximation the density-response function $K_{00}(\bfq,\omega)$ and the compressibility. We show explicitly that the long-wavelength limit of $K_{00}(\bfq,\omega)$ exhibits substantial anisotropic behavior induced by the modulation, and that the system tends to be incompressible in a direction orthogonal to the modulation as opposed to its response along the modulation.

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