Transport signatures of quasiparticle poisoning in a Majorana island

S. M. Albrecht; E. B. Hansen; A. P. Higginbotham; F. Kuemmeth; T. S. Jespersen; J. Nygård; Peter Krogstrup Jeppesen; J. Danon; K. Flensberg; C. M. Marcus

doi:10.1103/PhysRevLett.118.137701

Transport signatures of quasiparticle poisoning in a Majorana island

S. M. Albrecht, E. B. Hansen, A. P. Higginbotham, F. Kuemmeth, T. S. Jespersen, J. Nygård, Peter Krogstrup Jeppesen, J. Danon, K. Flensberg, C. M. Marcus

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Abstract

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 (∼1 μs) and sets a bound for a weakly coupled island (>10 μs). 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.

Originalsprog	Engelsk
Artikelnummer	137701
Tidsskrift	Physical Review Letters
Vol/bind	118
Udgave nummer	13
ISSN	0031-9007
DOI	https://doi.org/10.1103/PhysRevLett.118.137701
Status	Udgivet - 27 mar. 2017

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10.1103/PhysRevLett.118.137701

PhysRevLett.118.137701Forlagets udgivne version, 546 KB

http://arxiv.org/pdf/1612.05748Licens: Andet

Citationsformater

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AU - Albrecht, S. M.

AU - Hansen, E. B.

AU - Higginbotham, A. P.

AU - Kuemmeth, F.

AU - Jespersen, T. S.

AU - Nygård, J.

AU - Jeppesen, Peter Krogstrup

AU - Danon, J.

AU - Flensberg, K.

AU - Marcus, C. M.

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N2 - 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 (∼1 μs) and sets a bound for a weakly coupled island (>10 μs). 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.

AB - 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 (∼1 μs) and sets a bound for a weakly coupled island (>10 μs). 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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KW - cond-mat.supr-con

KW - quant-ph

U2 - 10.1103/PhysRevLett.118.137701

DO - 10.1103/PhysRevLett.118.137701

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VL - 118

JO - Physical Review Letters

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Transport signatures of quasiparticle poisoning in a Majorana island

Abstract

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