Phys. Rev. Lett. 68, 658–661 (1992)Edge excitations and the fractional quantum Hall effect in double quantum wellsReceived 15 August 1991; published in the issue dated 3 February 1992 The structure of the edge excitations of a quantum Hall droplet, confined in a double quantum well, is studied using a generalized version of the Wen-Stone chiral boson action. As the interwell tunneling, t, is increased, one finds a ‘‘metal-insulator’’ transition from a phase where the optic edge mode is ungapped to a phase where the optic mode is gapped. The large-t phase exhibits edge quasiexcitons whose charge is half that of a quasiparticle-quasihole bound state. The critical behavior of the conductances, the exciton gap, and the excitonic order parameter is discussed. © 1992 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.68.658
DOI:
10.1103/PhysRevLett.68.658
PACS:
71.28.+d, 71.30.+h, 73.20.Mf
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