Superfluid-insulator transition of two-dimensional disordered Bose gases

We study the two-dimensional weakly repulsive Bose gas at zero temperature in the presence of correlated disorder. Using large-scale simulations, we show that the low-energy Bogoliubov cumulative density of states remains quadratic up to a critical disorder strength, beyond which a power law with disorder-dependent exponent beta < 2 sets in. We associate this threshold behavior with the transition from superfluid to Bose glass, and compare the resulting mean-field phase diagram with scaling laws and the Thomas-Fermi percolation threshold of the mean-field density profile.


Published in:
Physical Review A, 90, 3, 031603
Year:
2014
Publisher:
College Pk, American Physical Society
ISSN:
1050-2947
Laboratories:




 Record created 2014-12-30, last modified 2018-03-17

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