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13 papers · 1 filter
Topological two-body bands in a multiband Hubbard model
M. Iskin
In a multiband Hubbard model the self-consistency relations for the two-body bound-state bands are in the form of a nonlinear eigenvalue problem. Assuming that the resultant eigenv…
Dimers, trimers, tetramers, and other multimers in a multiband Bose-Hubbard model
M. Iskin, A. Keleş
We study the bound states of identical bosons that are described by a multiband Bose-Hubbard model with generic hoppings and an attractive onsite interaction. Using a variation…
Atom-dimer and dimer-dimer scatterings in a spin-orbit coupled Fermi gas
M. Iskin
Using the diagrammatic approach, here we study how spin-orbit coupling (SOC) affects the fermion-dimer and dimer-dimer scattering lengths in the Born approximation, and benchmark t…
Bardeen-Cooper-Schrieffer--type pairing in a spin- Bose gas with spin-orbit coupling
M. Iskin
We apply the functional path-integral approach to analyze how the presence of a spin-orbit coupling (SOC) affects the basic properties of a BCS-type paired state in a two-component…
Origin of flat-band superfluidity on the Mielke checkerboard lattice
M. Iskin
The Mielke checkerboard is known to be one of the simplest two-band lattice models exhibiting an energetically flat band that is in touch with a quadratically dispersive band in th…
Superfluid stiffness for the attractive Hubbard model on a honeycomb optical lattice
M. Iskin
In addition to the conventional contribution that is directly controlled by the single-particle energy spectrum, the superfluid phase stiffness of a two-component Fermi gas has a g…