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Parity Effect in Ground State Energies of Ultrasmall Superconducting Grains | | K.A. Matveev
; A.I. Larkin
; | | Date: |
8 Dec 1996 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Superconductivity | cond-mat.mes-hall cond-mat.supr-con | | Abstract: | We study the superconductivity in small grains in the regime when the quantum level spacing $deltavarepsilon$ is comparable to the gap $Delta$. As $deltavarepsilon$ is increased, the system crosses over from superconducting to normal state. This crossover is studied by calculating the dependence of the ground state energy of a grain on the parity of the number of electrons. The states with odd numbers of particles carry an additional energy $Delta_P$, which shows non-monotonic dependence on $deltavarepsilon$. Our predictions can be tested experimentally by studying the parity-induced alternation of Coulomb blockade peak spacings in grains of different sizes. | | Source: | arXiv, cond-mat/9701041 | | Services: | Forum | Review | PDF | Favorites | |
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