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Coulomb Blockade of a Nearly Open Majorana Island
Dmitry Pikulin1, Karsten Flensberg2, Leonid I Glazman3
1Microsoft Quantum, Microsoft Station Q, University of California, Santa Barbara, California 93106-6105, USA.
Abstract:
We consider the ground-state energy and the spectrum of the low-energy excitations of a Majorana island formed of topological superconductors connected by a single-mode junction of arbitrary transmission. Coulomb blockade results in e-periodic modulation of the energies with the gate-induced charge. We find the amplitude of modulation as a function of reflection coefficient R. The amplitude scales as sqrt[R] in the limit R→0. At larger R, the dependence of the amplitude on the Josephson and charging energies is similar to that of a conventional-superconductor Cooper-pair box. The crossover value of R is small and depends on the ratio of the charging energy to superconducting gap.
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