Evidence of topological superconductivity in planar Josephson junctions
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Evidence of topological superconductivity in planar Josephson junctions. / Fornieri, Antonio; Whiticar, Alexander M.; Setiawan, F.; Marín, Elías Portolés; Drachmann, Asbjørn C. C.; Keselman, Anna; Gronin, Sergei; Thomas, Candice; Wang, Tian; Kallaher, Ray; Gardner, Geoffrey C.; Berg, Erez; Manfra, Michael J.; Stern, Ady; Marcus, Charles M.; Nichele, Fabrizio.
I: Nature, Bind 569, 02.05.2019, s. 89-92.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Evidence of topological superconductivity in planar Josephson junctions
AU - Fornieri, Antonio
AU - Whiticar, Alexander M.
AU - Setiawan, F.
AU - Marín, Elías Portolés
AU - Drachmann, Asbjørn C. C.
AU - Keselman, Anna
AU - Gronin, Sergei
AU - Thomas, Candice
AU - Wang, Tian
AU - Kallaher, Ray
AU - Gardner, Geoffrey C.
AU - Berg, Erez
AU - Manfra, Michael J.
AU - Stern, Ady
AU - Marcus, Charles M.
AU - Nichele, Fabrizio
N1 - [Qdev]
PY - 2019/5/2
Y1 - 2019/5/2
N2 - Majorana zero modes are quasiparticle states localized at the boundaries of topological superconductors that are expected to be ideal building blocks for fault-tolerant quantum computing. Several observations of zero-bias conductance peaks measured in tunneling spectroscopy above a critical magnetic field have been reported as experimental indications of Majorana zero modes in superconductor/semiconductor nanowires. On the other hand, two dimensional systems offer the alternative approach to confine Ma jorana channels within planar Josephson junctions, in which the phase difference {\phi} between the superconducting leads represents an additional tuning knob predicted to drive the system into the topological phase at lower magnetic fields. Here, we report the observation of phase-dependent zero-bias conductance peaks measured by tunneling spectroscopy at the end of Josephson junctions realized on a InAs/Al heterostructure. Biasing the junction to {\phi} ~ {\pi} significantly reduces the critical field at which the zero-bias peak appears, with respect to {\phi} = 0. The phase and magnetic field dependence of the zero-energy states is consistent with a model of Majorana zero modes in finite-size Josephson junctions. Besides providing experimental evidence of phase-tuned topological superconductivity, our devices are compatible with superconducting quantum electrodynamics architectures and scalable to complex geometries needed for topological quantum computing.
AB - Majorana zero modes are quasiparticle states localized at the boundaries of topological superconductors that are expected to be ideal building blocks for fault-tolerant quantum computing. Several observations of zero-bias conductance peaks measured in tunneling spectroscopy above a critical magnetic field have been reported as experimental indications of Majorana zero modes in superconductor/semiconductor nanowires. On the other hand, two dimensional systems offer the alternative approach to confine Ma jorana channels within planar Josephson junctions, in which the phase difference {\phi} between the superconducting leads represents an additional tuning knob predicted to drive the system into the topological phase at lower magnetic fields. Here, we report the observation of phase-dependent zero-bias conductance peaks measured by tunneling spectroscopy at the end of Josephson junctions realized on a InAs/Al heterostructure. Biasing the junction to {\phi} ~ {\pi} significantly reduces the critical field at which the zero-bias peak appears, with respect to {\phi} = 0. The phase and magnetic field dependence of the zero-energy states is consistent with a model of Majorana zero modes in finite-size Josephson junctions. Besides providing experimental evidence of phase-tuned topological superconductivity, our devices are compatible with superconducting quantum electrodynamics architectures and scalable to complex geometries needed for topological quantum computing.
KW - cond-mat.mes-hall
KW - cond-mat.supr-con
U2 - 10.1038/s41586-019-1068-8
DO - 10.1038/s41586-019-1068-8
M3 - Journal article
C2 - 31019303
VL - 569
SP - 89
EP - 92
JO - Nature
JF - Nature
SN - 0028-0836
ER -
ID: 212294709