Tuesday, July 9, 2013

1307.1707 (Baoming Tang et al.)

Finite-temperature properties of strongly correlated fermions in the
honeycomb lattice

Baoming Tang, Thereza Paiva, Ehsan Khatami, Marcos Rigol
We study finite-temperature properties of strongly interacting fermions in the honeycomb lattice utilizing numerical linked-cluster expansions and determinantal quantum Monte Carlo simulations. We analyze a number of thermodynamic quantities, including the entropy, the specific heat, uniform and staggered spin susceptibilities, short-range spin correlations, and the double occupancy at and away from half filling. We examine the viability of adiabatic cooling by increasing the interaction strength for homogeneous as well as for trapped systems. For the homogeneous case, this process is found to be more efficient at finite doping than at half filling. That, in turn, leads to an efficient adiabatic cooling in the presence of a trap which, starting with even relatively high entropies, can drive the system to a Mott insulating phase with substantial antiferromagnetic correlations.
View original: http://arxiv.org/abs/1307.1707

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