Transport Signatures of Quasiparticle Poisoning in a Majorana Island

被引：91
作者：
Albrecht, S. M. [1 ]
Hansen, E. B. [1 ]
Higginbotham, A. P. [1 ,2 ]
Kuemmeth, F. [1 ]
Jespersen, T. S. [1 ]
Nygard, J. [1 ]
Krogstrup, P. [1 ]
Danon, J. [1 ,3 ]
Flensberg, K. [1 ]
Marcus, C. M. [1 ]
机构：
[1] Univ Copenhagen, Ctr Quantum Devices & Stn Q Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[2] Univ Colorado & NIST, JILA, Boulder, CO 80309 USA
[3] Norwegian Univ Sci & Technol, Dept Phys, NTNU, N-7491 Trondheim, Norway
来源：
PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 13期
基金：
新加坡国家研究基金会;
关键词：
SEMICONDUCTOR-SUPERCONDUCTOR NANOWIRES; PARITY LIFETIME; QUANTUM DOTS; FLUCTUATIONS; TRANSISTOR; FERMIONS;
D O I：
10.1103/PhysRevLett.118.137701
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate effects of quasiparticle poisoning in a Majorana island with strong tunnel coupling to normal-metal leads. In addition to the main Coulomb blockade diamonds, "shadow" diamonds appear, shifted by 1e in gate voltage, consistent with transport through an excited (poisoned) state of the island. Comparison to a simple model yields an estimate of parity lifetime for the strongly coupled island (similar to 1 mu s) and sets a bound for a weakly coupled island (> 10 mu s). Fluctuations in the gate-voltage spacing of Coulomb peaks at high field, reflecting Majorana hybridization, are enhanced by the reduced lever arm at strong coupling. When converted from gate voltage to energy units, fluctuations are consistent with previous measurements.
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页数：6
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