Theoretical Solid State Physics
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Symmetric Minimally Entangled Typical Thermal States

Benedikt Bruognolo, LMU

20.05.2015 at 12:15 

 

We extend White's minimally entangled typically thermal states approach (METTS) to allow abelian and non-ablian symmetries to be exploited when computing finite-temperature response functions in one-dimensional (1D) quantum systems. Our approach, called SYMETTS, starts from a METTS sample of states that are not symmetry eigenstates, and generates from each a symmetry eigenstate. These symmetry states are then used to calculated dynamic response functions. SYMETTS is ideally suited to determine the low-temperature spectra of 1D quantum systems with high resolution.

We employ this method to study a generalized diamond chain model for the natural mineral azurite, which features a plateau at 1/3 in the magnetization curve at low temperatures. Our calculations provide new insights into the effects of temperature on magnetization and excitation spectra in the plateau phase, which can be fully understood in terms of the microscopic model.

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