Structure of the number-projected BCS wave function
| Autor: | S. Pittel, Jorge Dukelsky, C. Esebbag |
|---|---|
| Přispěvatelé: | Ministerio de Economía y Competitividad (España), National Science Foundation (US) |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Nuclear Theory 010308 nuclear & particles physics Condensed Matter - Superconductivity Degenerate energy levels FOS: Physical sciences 01 natural sciences Nuclear Theory (nucl-th) Superconductivity (cond-mat.supr-con) symbols.namesake Quantum mechanics Pairing 0103 physical sciences symbols 010306 general physics Hamiltonian (quantum mechanics) Wave function Nuclear theory |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 5 pags., 4 figs. We study the structure of the number-projected BCS (PBCS) wave function in the particle-hole basis, displaying its similarities with coupled clusters theory (CCT). The analysis of PBCS together with several modifications suggested by the CCT wave function is carried out for the exactly solvable Richardson model involving a pure pairing Hamiltonian acting in a space of equally spaced, doubly degenerate levels. We point out the limitations of PBCS to describe the nonsuperconducting regime and suggest possible avenues for improvement. ©2016 American Physical Society This work has been supported by the Spanish Ministry of Economy and Competitiveness under Grant No. FIS2012- 34479 and in part by the US National Science Foundation under Grant No. 0854873. |
| Databáze: | OpenAIRE |
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