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Quantum Hall effect in double-quantum-well systems

Song He, X. C. Xie, S. Das Sarma, and F. C. Zhang
Phys. Rev. B 43, 9339(R) – Published 15 April 1991
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Abstract

We investigate the nature of the electron ground state of a double-quantum-well system in a strong perpendicular magnetic field by using finite-size numerical studies on spherical systems. Interwell electron tunneling is explicitly included by taking into account the spreading of the electron wave function in the direction perpendicular to the double quantum well. As a function of interwell separation, the overlap between the exact ground state of a finite-size system and the Jastrow-type variational wave function is calculated for filling factors ν=1, 2/3, and 1/2. Our results show (a) the destruction of the ν=1 integral quantum Hall effect due to electron-electron interaction; (b) the switching of the ground state from one quantum Hall state to another due to the competition between interwell tunneling and electron correlation; and (c) the possibility of observing the ν=1/2 fractional quantum Hall effect in a double-quantum-well system at appropriate well separations.

  • Received 21 December 1990

DOI:https://doi.org/10.1103/PhysRevB.43.9339

©1991 American Physical Society

Authors & Affiliations

Song He, X. C. Xie, and S. Das Sarma

  • Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742

F. C. Zhang

  • Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221

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Issue

Vol. 43, Iss. 11 — 15 April 1991

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