Broken-Symmetry States in Quantum Hall Superlattices

Details Broken-Symmetry States in Quantum Hall Superlattices Broken-Symmetry States in Quantum Hall Superlattices

2001-12-26

arxiv.org/abs/cond-mat/0112462v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages LaTeX, 4 figures EPS, to be published in PRB

Scientific paper

10.1103/PhysRevB.65.115323

We argue that broken-symmetry states with either spatially diagonal or spatially off-diagonal order are likely in the quantum Hall regime, for clean multiple quantum well (MQW) systems with small layer separations. We find that for MQW systems, unlike bilayers, charge order tends to be favored over spontaneous interlayer coherence. We estimate the size of the interlayer tunneling amplitude needed to stabilize superlattice Bloch minibands by comparing the variational energies of interlayer-coherent superlattice miniband states with those of states with charge order and states with no broken symmetries. We predict that when coherent miniband ground states are stable, strong interlayer electronic correlations will strongly enhance the growth-direction tunneling conductance and promote the possibility of Bloch oscillations.

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