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 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.
Original language | English |
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Article number | 016801 |
Journal | Physical Review Letters |
Volume | 122 |
Issue number | 1 |
Number of pages | 5 |
ISSN | 0031-9007 |
DOIs | |
Publication status | Published - 3 Jan 2019 |