Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-03-21
Phys. Rev. B 80, 014425 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 5 figures, scheme of the system and comparison with specific heat added. Accepted for publication in Phys. Rev. B
Scientific paper
We study heat transport in a one-dimensional inhomogeneous quantum spin 1/2 system. It consists of a finite-size XX spin chain coupled at its ends to semi-infinite XX and XY chains at different temperatures, which play the role of heat and spin reservoirs. After using the Jordan-Wigner transformation we map the original spin Hamiltonian into a fermionic Hamiltonian, which contains normal and pairing terms. We find the expressions for the heat currents and solve the problem with a non-equilibrium Green's function formalism. We analyze the behavior of the heat currents as functions of the model parameters. When finite magnetic fields are applied at the two reservoirs, the system exhibits rectification effects in the heat flow.
Aligia Armando A.
Arrachea Liliana
Lozano Gustavo S.
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