Theoretical description of the superconducting state of nanostructures at intermediate temperatures: a combined treatment of collective modes and fluctuations.
作者： Pedro Ribeiro , Antonio M García-García , None
DOI: 10.1103/PHYSREVLETT.108.097004
关键词: Nanostructure 、 Thermal 、 Superconductivity 、 Quantum fluctuation 、 Quantum mechanics 、 Condensed matter physics 、 Physics 、 Pairing 、 Partition function (statistical mechanics) 、 Band gap 、 State (functional analysis)
摘要: A rigorous treatment of the combined effect thermal and quantum fluctuations in a zero-dimensional superconductor is considered one most relevant still-unsolved problems theory nanoscale superconductors. In this Letter, we notice that divergences plagued previous calculations are avoided by identifying treating nonperturbatively low-energy collective mode. way, obtain for first time closed expressions partition function superconducting order parameter which include both types fluctuation valid at any temperature to leading δ/Δ(0), where δ mean level spacing Δ(0) bulk energy gap. Our results pave way quantitative description superconductivity nanostructures finite pairing hot nuclei.
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