Phase transition and spin-wave dispersion in quantum Hall bilayers at filling factor nu=1

Details Phase transition and spin-wave dispersion in quantum Hall bilayers at filling factor nu=1 Phase transition and spin-wave dispersion in quantum Hall bilayers at filling factor nu=1

2001-05-31

arxiv.org/abs/cond-mat/0105625v2

Physica E 12, 28 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Four pages, proceedings for EP2DS-14, Prague 2001

Scientific paper

10.1016/S1386-9477(01)00299-5

We present an effective Hamiltonian for a bilayer quantum Hall system at filling factor $\nu=1$ neglecting charge fluctuations. Our model is formulated in terms of spin and pseudospin operators and is an exact representation of the system within the above approximation. We analyze its low-lying excitations in terms of spin-wave theory. Moreover we add to previous first-principle exact-diagonalization studies concentrating on the quantum phase transition seen in this system.

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