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4 papers · 1 filter
The spectral gap of the ferromagnetic XXZ chain
Tohru Koma, Bruno Nachtergaele
We prove that the spectral gap of the spin-1/2 ferromagnetic XXZ chain with Hamiltonian , is given…
Boltzmann equation approach for transport in systems subject to microwave irradiation
Tobias Brandes
We calculate the electronic transport properties of a system which is irradiated by a homogeneous microwave field. Within a Boltzmann equation approach, a general expression for th…
Ferromagnetism in Hubbard Models
Hal Tasaki
We present the first rigorous examples of non-singular Hubbard models which exhibit ferromagnetism at zero temperature. The models are defined in arbitrary dimensions, and are char…
Mutual Exclusion Statistics in Exactly Solvable Models in One and Higher Dimensions at Low Temperatures
Y. Hatsugai, M. Kohmoto, T. Koma +2
We study statistical characterization of the many-body states in exactly solvable models with internal degrees of freedom. The models under consideration include the isotropic and…