Quantum crystallization of two-dimensional dipole systems |
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Authors: | Yu E Lozovik O L Berman |
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Institution: | (1) Institute of Spectroscopy, Russian Academy of Sciences, 142092 Troitsk, Moscow Region, Russia |
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Abstract: | An analysis is made of the region of existence of crystalline order in a system of spatially separated electrons (e) and holes (h) in two coupled quantum wells for various concentrations n, temperatures T, and distances D between the layers. A study is also made of crystallization in a system of electrons in semiconductor structures near a metal
electrode for various distances d between the semiconductor and the metal. Calculations of the crystalline phase were made using variational calculations of
the ground-state energy of the system allowing for pairing of quasiparticles with nonzero momentum. For a system of two coupled
quantum wells, regions in (T,n,D) space are determined in which electron (or hole) charge-density waves exist in each layer and regions where these charge-density
waves are in phase, in other words, indirect excitons (or pairs with spatially separated electrons and holes) interacting
as electric dipoles, become crystallized. In the electron system in semiconductor structures near a metal electrode, regions
of existence of an electron crystal are also obtained in (T,n,D) space, where over large distances the electrons interact as electric dipoles because of image forces.
Fiz. Tverd. Tela (St. Petersburg) 40, 1350–1355 (July 1998) |
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