ECRYS - 93
J. Phys. IV France 03 (1993) C2-9-C2-14
Nonlinear conductivity of a two-dimensional pinned charge-density wave in a strong magnetic fieldP.B. LITTLEWOOD1, A.J. MILLIS1, X. ZHU1 and B.G.A. NORMAND2
1 AT & T Bell Laboratories, Murray Hill, NJ 07974, U.S.A.
2 Department of Physics, M.I.T., Cambridge, MA 02139, U.S.A.
We present the theory of the dynamics of a two-dimensional Wigner crystal in a high magnetic field, assuming charge-density-wave correlations extend over a distance large compared to the interelectronic spacing. We consider the effects of both weak disorder and screening by uncondensed carriers. In an electric field large compared to the threshold field for sliding, a perturbative theory is used to calculate the nonlinear conductivity and correlation functions of the elastic strain. We compare our results to the behavior of conventional charge-density-wave systems, and stress the role of the large magnetic field, soft shear modulus, and screening by the background linear conductivity.
© EDP Sciences 1993