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Short note on the excitonic Mott phase |
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| Authors: | Klaus Ziegler Oleg L. Berman Roman Ya. Kezerashvili |
| Affiliation: | 1. Institut für Physik, Universit?t Augsburg, Augsburg, Germany.Klaus.Ziegler@physik.uni-augsburg.de;3. Physics Department, New York City College of Technology, The City University of New York, Brooklyn, NY, USA.;4. The Graduate School and University Center, The City University of New York, New York, NY, USA. |
| Abstract: | An exciton gas on a lattice is analysed in terms of a convergent hopping expansion. For a given chemical potential, our calculation provides a sufficient condition for the hopping rate to obtain an exponential decay of the exciton correlation function. This result indicates the existence of a Mott phase in which strong fluctuations destroy the long range correlations in the exciton gas at any temperature, either by thermal or by quantum fluctuations. |
| Keywords: | Mott insulators correlated systems low-dimensional structures |