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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…
Dissipation-driven quantum phase transition in superconductor-graphene systems
Roman M. Lutchyn, Victor Galitski, Gil Refael +1
We show that a system of Josephson junctions coupled via low-resistance tunneling contacts to graphene substrate(s) may effectively operate as a current switching device. The effec…
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-…
superfluid from s-wave interactions of fermionic cold atoms
Chuanwei Zhang, Sumanta Tewari, Roman Lutchyn +1
Two-dimensional () superfluids/superconductors offer a playground for studying intriguing physics such as quantum teleportation, non-Abelian statistics, and topologic…
Kinetics of non-equilibrium quasiparticle tunneling in superconducting charge qubits
M. D. Shaw, R. Lutchyn, P. Delsing +1
We directly observe low-temperature non-equilibrium quasiparticle tunneling in a pair of charge qubits based on the single Cooper-pair box. We measure even- and odd-state dwell tim…
Quantum decoherence of a charge qubit in a spin-fermion model
R. M. Lutchyn, L. Cywinski, Cody P. Nave +1
We consider quantum decoherence in solid-state systems by studying the transverse dynamics of a single qubit interacting with a fermionic bath and driven by external pulses. Our in…