395 citations
- University of Maryland, College ParkUS9 papers
- Max Planck Institute for Extraterrestrial PhysicsDE7 papers
- University of California, BerkeleyUS6 papers
- Washington State UniversityUS6 papers
- Instituto de Astrofísica de AndalucíaES5 papers
- National Institute for AstrophysicsIT5 papers
- Thüringer Landessternwarte TautenburgDE5 papers
- University of CopenhagenDK5 papers
- Istituto di Astrofisica Spaziale e Fisica Cosmica di BolognaIT4 papers
- Joint Quantum InstituteUS4 papers
- Max Planck SocietyDE4 papers
- National Space Science and Technology CenterUS4 papers
7 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…
Effects of quasiparticle ambipolarity on the Nernst effect in underdoped cuprate superconductors
Sumanta Tewari, Chuanwei Zhang
We consider the Nernst effect in the normal state of the underdoped cuprate superconductors, where recent quantum oscillation experiments have indicated the existence of Fermi surf…
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-…
Anomalous Nernst effect from a chiral d-density wave state in underdoped cuprate superconductors
Chuanwei Zhang, Sumanta Tewari, Victor M. Yakovenko +1
We show that the breakdown of time-reversal invariance, confirmed by the recent polar Kerr effect measurements in the cuprates, implies the existence of an anomalous Nernst effect…
Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic
Sumanta Tewari, Chuanwei Zhang, John Toner +1
Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCrO, we…