Thermodynamics of ultra-small metallic grains in the auxiliary-field Monte Carlo approach
Abstract
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.
- Publication:
-
arXiv e-prints
- Pub Date:
- February 2007
- DOI:
- 10.48550/arXiv.cond-mat/0702304
- arXiv:
- arXiv:cond-mat/0702304
- Bibcode:
- 2007cond.mat..2304A
- Keywords:
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- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect;
- Condensed Matter - Superconductivity;
- Nuclear Theory
- E-Print:
- 8 pages, 6 figures