Transport signatures of quasiparticle poisoning in a Majorana island
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Transport signatures of quasiparticle poisoning in a Majorana island. / Albrecht, S. M.; Hansen, E. B.; Higginbotham, A. P.; Kuemmeth, F.; Jespersen, T. S.; Nygård, J.; Jeppesen, Peter Krogstrup; Danon, J.; Flensberg, K.; Marcus, C. M.
In: Physical Review Letters, Vol. 118, No. 13, 137701, 27.03.2017.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Transport signatures of quasiparticle poisoning in a Majorana island
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.
N1 - [Qdev]
PY - 2017/3/27
Y1 - 2017/3/27
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 {\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. In 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 {\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. In energy units, fluctuations are consistent with previous measurements.
KW - cond-mat.mes-hall
KW - cond-mat.supr-con
KW - quant-ph
U2 - 10.1103/PhysRevLett.118.137701
DO - 10.1103/PhysRevLett.118.137701
M3 - Journal article
C2 - 28409973
VL - 118
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 13
M1 - 137701
ER -
ID: 179319948