Effects of the electrostatic environment on superlattice Majorana nanowires
Entity
UAM. Departamento de Física de la Materia Condensada; UAM. Departamento de Física Teórica de la Materia CondensadaPublisher
American Physical SocietyDate
2019-07-02Citation
10.1103/PhysRevB.100.045301
Physical Review B 100.4 (2019): 045301
ISSN
2469-9950 (print); 2469-9969 (online)DOI
10.1103/PhysRevB.100.045301Funded by
We thank E. J. H. Lee, H. Beidenkopf, E. G. Michel, N. Avraham, H. Shtrikman, and J. Nygård for valuable discussions. Research supported by the Spanish MINECO through Grants No. FIS2016-80434-P, No. BES-2017-080374, and No. FIS2017-84860-R (AEI/FEDER, EU), the European Union's Horizon 2020 research and innovation programme under the FETOPEN Grant Agreement No. 828948 and Grant Agreement LEGOTOP No. 788715, the Ramón y Cajal programme RYC-2011-09345, the María de Maeztu Programme for Units of Excellence in R&D (MDM-2014-0377), the DFG (CRC/Transregio 183, EI 519/7- 1), the Israel Science Foundation (ISF), and the Binational Science Foundation (BSF)Project
Gobierno de España. FIS2016-80434-P; Gobierno de España. FIS2017-84860-R; info:eu-repo/grantAgreement/EC/H2020/828948/EU//FETOPEN; info:eu-repo/grantAgreement/EC/H2020/788715/EU//LEGOTOP; Gobierno de España. MDM-2014-0377Editor's Version
https://doi.org/10.1103/PhysRevB.100.045301Subjects
3D modeling; Nanowires; Electrostatics; Superconducting materials; Topology; Wave functions; FísicaRights
© 2019 American Physical Society.Abstract
Finding ways of creating, measuring, and manipulating Majorana bound states (MBSs) in superconducting-semiconducting nanowires is a highly pursued goal in condensed matter physics. It was recently proposed that a periodic covering of the semiconducting nanowire with superconductor fingers would allow both gating and tuning the system into a topological phase while leaving room for a local detection of the MBS wave function. We perform a detailed, self-consistent numerical study of a three-dimensional (3D) model for a finite-length nanowire with a superconductor superlattice including the effect of the surrounding electrostatic environment, and taking into account the surface charge created at the semiconductor surface. We consider different experimental scenarios where the superlattice is on top or at the bottom of the nanowire with respect to a back gate. The analysis of the 3D electrostatic profile, the charge density, the low-energy spectrum, and the formation of MBSs reveals a rich phenomenology that depends on the nanowire parameters as well as on the superlattice dimensions and the external back-gate potential. The 3D environment turns out to be essential to correctly capture and understand the phase diagram of the system and the parameter regions where topological superconductivity is established
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Google Scholar:Escribano, Samuel D.
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Levy-Yeyati Mizrahi, Alfredo
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Oreg, Yuval
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Prada, Elsa
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