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- University of Maryland, College ParkUS27 papers
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4 papers · 1 filter
Effects of a dilute gas of fermions on the superfluid-insulator phase diagram of the Bose-Hubbard model
Sumanta Tewari, Roman M. Lutchyn, S. Das Sarma
Building on the work of Fisher et al. (Phys. Rev. B 40, 546 (1989)), we develop a framework for perturbation theory in the Bose-Hubbard model and apply it to calculate the effects…
Paired electron pockets in the hole-doped cuprates
Victor Galitski, Subir Sachdev
We propose a theory for the underdoped hole-doped cuprates, focusing on the "nodal-anti-nodal dichotomy" observed in recent experiments. Our theory begins with an ordered antiferro…
Loss of superfluidity by fermions in the boson Hubbard model on an optical lattice
Roman M. Lutchyn, Sumanta Tewari, S. Das Sarma
The experimentally observed loss of superfluidity by introducing fermions to the boson Hubbard system on an optical lattice is explained. We show that the virtual transitions of th…
Boson Hubbard model with weakly coupled Fermions
R. M. Lutchyn, S. Tewari, S. Das Sarma
Using an imaginary-time path integral approach, we develop the perturbation theory suited to the boson Hubbard model, and apply it to calculate the effects of a dilute gas of spin-…