Physics – Condensed Matter
Scientific paper
1996-05-23
Physics
Condensed Matter
26 pages, RevTex, 8 postscript figures (submitted to Phys. Rev. B)
Scientific paper
10.1103/PhysRevB.54.11644
At strong magnetic fields double-layer two-dimensional-electron-gas systems can form an unusual broken symmetry state with spontaneous inter-layer phase coherence. The system can be mapped to an equivalent system of pseudospin $1/2$ particles with pseudospin-dependent interactions and easy-plane magnetic order. In this paper we discuss how the presence of a weak interlayer tunneling term alters the properties of double-layer systems when the broken symmetry is present. We use the energy functional and equations of motion derived earlier to evaluate the zero-temperature response functions of the double-layer system and use our results to discuss analogies between this system and Josephson-coupled superconducting films. We also present a qualitative picture of the low-energy charged excitations of this system. We show that parallel fields induce a highly collective phase transition to an incommensurate state with broken translational symmetry.
Belkhir Lotfi
Girvin Steven M.
MacDonald Allan. H.
Moon Kyungsun
Mori Hatsumi
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