Journal
PHYSICAL REVIEW B
Volume 104, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.045422
Keywords
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Funding
- National Science Foundation of China [92065203]
- Chinese Academy of Sciences [XDB33000000]
- Synergic Extreme Condition User Facility
- European Research Council (ERC)
- Dutch Organization for Scientific Research (NWO)
- Office of Naval Research (ONR)
- Laboratory for Physical Sciences
- Microsoft Corporation
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The study reveals that under specific conditions, the charge periodicity of a hybrid InSb-Al island changes from 2e to 1e, with correlated oscillations of peak spacings and heights observed in certain gate voltage regions.
We measure the charge periodicity of Coulomb blockade conductance oscillations of a hybrid InSb-Al island as a function of gate voltage and parallel magnetic field. The periodicity changes from 2e to 1e at a gate-dependent value of the magnetic field, B*, decreasing from a high to a low limit upon increasing the gate voltage. In the gate voltage region between the two limits, which our numerical simulations indicate to be the most promising for locating Majorana zero modes, we observe correlated oscillations of peak spacings and heights. For positive gate voltages, the 2e-1e transition with low B* is due to the presence of nontopological states whose energy quickly disperses below the charging energy due to the orbital effect of the magnetic field. Our measurements highlight the importance of a careful exploration of the entire available phase space of a proximitized nanowire as a prerequisite to define future topological qubits.
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