Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Mikelsons, K."'
Publikováno v:
Phys. Rev. A 92, 053612 (2015)
In the vicinity of a Feshbach resonance, a system of ultracold atoms on an optical lattice undergoes rich physical transformations which involve molecule formation and hopping of molecules on the lattice and thus goes beyond a single-band Hubbard mod
Externí odkaz:
http://arxiv.org/abs/1408.0206
Publikováno v:
Scientific Reports 4, 4699 (2014)
There is much interest in how quantum systems thermalize after a sudden change, because unitary evolution should preclude thermalization. The eigenstate thermalization hypothesis resolves this because all observables for quantum states in a small ene
Externí odkaz:
http://arxiv.org/abs/1310.8354
Publikováno v:
Phys. Rev. E 89, 023306 (2014)
We present a nonequilibrium strong-coupling approach to inhomogeneous systems of ultracold atoms in optical lattices. We demonstrate its application to the Mott-insulating phase of a two-dimensional Fermi-Hubbard model in the presence of a trap poten
Externí odkaz:
http://arxiv.org/abs/1309.5994
Publikováno v:
Phys. Rev. A 89, 021602(R) (2014)
Using a recently developed strong-coupling method, we present a comprehensive theory for doublon production processes in modulation spectroscopy of a three-dimensional system of ultracold fermionic atoms in an optical lattice with a trap. The theoret
Externí odkaz:
http://arxiv.org/abs/1304.7802
Publikováno v:
Physical Review Letters 109, 260402 (2012)
We use a self-consistent strong-coupling expansion for the self-energy (perturbation theory in the hopping) to describe the nonequilibrium dynamics of strongly correlated lattice fermions. We study the three-dimensional homogeneous Fermi-Hubbard mode
Externí odkaz:
http://arxiv.org/abs/1210.5797
Autor:
Chen, K. -S., Pathak, S., Yang, S. -X., Su, S. -Q., Galanakis, D., Mikelsons, K., Jarrell, M., Moreno, J.
Publikováno v:
Phys. Rev. B 84, 245107 (2011)
A quantum critical point (QCP), separating the non-Fermi liquid region from the Fermi liquid, exists in the phase diagram of the 2D Hubbard model [Vidhyadhiraja et. al, Phys. Rev. Lett. 102, 206407 (2009)]. Due to the vanishing of the critical temper
Externí odkaz:
http://arxiv.org/abs/1104.3261
Autor:
Mikelsons, K., Freericks, J. K.
Publikováno v:
Phys. Rev. A, 83, 043609 (2011)
We model a system of ultracold fermionic dipolar molecules on a two-dimensional square lattice. Assuming that the molecules are in their nondegenerate hyperfine ground state, and that the dipole moment is polarized perpendicular to the plane (as in t
Externí odkaz:
http://arxiv.org/abs/1102.0778
Autor:
Galanakis, D., Khatami, E., Mikelsons, K., Macridin, A., Moreno, J., Browne, D. A., Jarrell, M.
Publikováno v:
Philosophical Transactions of the Royal Society A, 369, 1670 (2011)
Transport measurements on the cuprates suggest the presence of a quantum critical point hiding underneath the superconducting dome near optimal hole doping. We provide numerical evidence in support of this scenario via a dynamical cluster quantum Mon
Externí odkaz:
http://arxiv.org/abs/1009.2563
Autor:
Khatami, E., Mikelsons, K., Galanakis, D., Macridin, A., Moreno, J., Scalettar, R. T., Jarrell, M.
Publikováno v:
Phys. Rev. B 81, 201101(R) (2010)
We investigate the two-dimensional Hubbard model with next-nearest-neighbor hopping, t', using the dynamical cluster approximation. We confirm the existence of a first-order phase-separation transition terminating at a second-order critical point at
Externí odkaz:
http://arxiv.org/abs/0909.0759
Publikováno v:
Phys. Rev. B 80, 140505(R) (2009)
We study the thermodynamics of the two-dimensional Hubbard model within the dynamical cluster approximation. We use continuous time quantum Monte Carlo as a cluster solver to avoid the systematic error which complicates the calculation of the entropy
Externí odkaz:
http://arxiv.org/abs/0909.0498