Phase transition and spin-wave dispersion in quantum Hall bilayers at filling factor nu=1
Abstract
We present an effective Hamiltonian for a bilayer quantum Hall system at filling factor =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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