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Quantum Glass Phase of Boson Systems

Event Details

Event Dates: 

Wednesday, October 15, 2014 - 12:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Dr. Ka-Ming Tam

Speaker Affiliation(s): 

Louisiana State University
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Public Seminar

Event Details & Abstract: 

I will discuss the effects of randomness in the Boson systems.

While the Bose-Hubbard model with disorder in the local field has been studied for over two decades, the effects of disorder in the local coupling have rarely been considered. Motivated by experimental evidence of glassy behaviors in  Helium-4, we introduce a Bose-Hubbard Hamiltonian with random disordered interaction as a model to study the interplay of superfluidity and glassiness in a system of three-dimensional hard-core Bosons. Solving the model by Monte Carlo simulations, we show that the disordered interaction promotes a stable superglass phase, where superflow and glassy density localization coexist in equilibrium without exhibiting phase separation.