Intrinsic gap and exciton condensation in the nu_T=1 bilayer system

Details Intrinsic gap and exciton condensation in the nu_T=1 bilayer system Intrinsic gap and exciton condensation in the nu_T=1 bilayer system

2010-02-18

arxiv.org/abs/1002.3519v1

Phys. Rev. Lett. \textbf{104}, 056802 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.104.056802

We investigate the quasiparticle excitation of the bilayer quantum Hall (QH) system at total filling factor $\nu_{\mathrm{T}} = 1$ in the limit of negligible interlayer tunneling under tilted magnetic field. We show that the intrinsic quasiparticle excitation is of purely pseudospin origin and solely governed by the inter- and intra-layer electron interactions. A model based on exciton formation successfully explains the quantitative behavior of the quasiparticle excitation gap, demonstrating the existence of a link between the excitonic QH state and the composite fermion liquid. Our results provide a new insight into the nature of the phase transition between the two states.

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