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Elementary excitations of antiferromagnetic spin-1 bosons in an optical lattice
Misako Shinozaki, Shunji Tsuchiya, Shumpei Abe +2
We study elementary excitations of spin-1 bosons with antiferromagnetic interaction in an optical lattice by applying the Gutzwiller approximation to the spin-1 Bose-Hubbard model.…
Theory of the Two-Particle Emission from Superfluid Fermi Gases in the BCS-BEC Crossover
Emiko Arahata, Tetsuro Nikuni
We present a theory of the emission of fermion pairs from a superfluid Fermi gas induced by a photon absorption. In the solid state physics, this type of process is called double p…
The Higgs mode in a superfluid of Dirac fermions
Shunji Tsuchiya, R. Ganesh, Tetsuro Nikuni
We study the Higgs amplitude mode in the s-wave superfluid state on the honeycomb lattice inspired by recent cold atom experiments. We consider the attractive Hubbard model and foc…