Thermodynamics of ultra-small metallic grains in the auxiliary-field Monte Carlo approach

Details Thermodynamics of ultra-small metallic grains in the auxiliary-field Monte Carlo approach Thermodynamics of ultra-small metallic grains in the auxiliary-field Monte Carlo approach

2007-02-13

arxiv.org/abs/cond-mat/0702304v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 6 figures

Scientific paper

We use an auxiliary-field Monte Carlo (AFMC) method to calculate thermodynamic properties (spin susceptibility and heat capacity) of ultra-small metallic grains in the presence of pairing correlations. This method allows us to study the crossover from bulk systems, where mean-field BCS theory is valid, to the fluctuation-dominated regime of ultra-small particles at finite temperature. The computational effort at low temperatures is significantly reduced by exploiting a simple renormalization method.

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