Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.016801
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Funding
- NSF DMR Grant [1603243]
- Danish National Research Foundation
- Deutsche Forschungsgemeinschaft (Bonn) within the network TRR 183 [277101999]
- European Union [600382]
- ONR [Q00704]
- National Science Foundation [PHY-1607611]
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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 root 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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