10-14 July 2016
Africa/Johannesburg timezone
Paper Submission is Open!! Registration for CCP2016 Conference will be open at the registration desk @ St. George's Hotel reception area on Sunday 10 July / Welcome Dinner at 18:30 SAST.

INVITED SPEAKER: Quantum critical behavior of a superfluid-insulator transition

13 Jul 2016, 14:30
Oral Presentation Quantum Many Body and Strongly Correlated Systems Parallel Track B


Prof. Thomas Vojta (Missouri University of Science and Technology)

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We investigate the quantum phase transitions as well as the phase diagram of a two-dimensional quantum rotor model with off-diagonal disorder by means of large-scale Monte-Carlo simulations. In contrast to the exotic critical behavior found in other random quantum systems, this Hamiltonian features a conventional (finite-disorder) critical point with power-law scaling but with critical exponents that differ from the clean ones. We also address the percolation quantum phase transition across the lattice percolation threshold, and we relate our findings to a general classification of phase transitions with quenched disorder. Moreover, we discuss technical aspects of our computational approach that permit the efficient simulation of random quantum systems including anisotropic finite-size scaling and improved Monte-Carlo estimators.

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Prof. Thomas Vojta (Missouri University of Science and Technology)

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