Transport signatures of a junction between a quantum spin Hall system and a chiral topological superconductor

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • E. G. Novik
  • B. Trauzettel
  • P. Recher

Externe Organisationen

  • Technische Universität Dresden
  • Julius-Maximilians-Universität Würzburg
  • Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
  • Exzellenzcluster ct.qmat - Complexity and Topology in Quantum Matter
  • Technische Universität Braunschweig
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer235308
FachzeitschriftPhysical Review B
Jahrgang101
Ausgabenummer23
PublikationsstatusVeröffentlicht - 15 Juni 2020
Extern publiziertJa

Abstract

We investigate transport through a normal-superconductor (NS) junction made from a quantum spin Hall (QSH) system with helical edge states and a two-dimensional (2D) chiral topological superconductor (TSC) having a chiral Majorana edge mode. We employ a two-dimensional extended four-band model for HgTe-based quantum wells in a magnetic (Zeeman) field and subject to s-wave superconductivity. We show using the Bogoliubov-de Gennes scattering formalism that this structure provides a striking transport signal of a 2D TSC. As a function of the sample width (or Fermi energy) the conductance resonances go through a sequence of 2e2/h (nontrivial phase) and 4e2/h plateaux (trivial phase) which fall within the region of a nonzero Chern number (2D limit) as the sample width becomes large. These signatures are a manifestation of the topological nature of the QSH effect and the TSC.

ASJC Scopus Sachgebiete

Zitieren

Transport signatures of a junction between a quantum spin Hall system and a chiral topological superconductor. / Novik, E. G.; Trauzettel, B.; Recher, P.
in: Physical Review B, Jahrgang 101, Nr. 23, 235308, 15.06.2020.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Novik EG, Trauzettel B, Recher P. Transport signatures of a junction between a quantum spin Hall system and a chiral topological superconductor. Physical Review B. 2020 Jun 15;101(23):235308. doi: 10.1103/PhysRevB.101.235308
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abstract = "We investigate transport through a normal-superconductor (NS) junction made from a quantum spin Hall (QSH) system with helical edge states and a two-dimensional (2D) chiral topological superconductor (TSC) having a chiral Majorana edge mode. We employ a two-dimensional extended four-band model for HgTe-based quantum wells in a magnetic (Zeeman) field and subject to s-wave superconductivity. We show using the Bogoliubov-de Gennes scattering formalism that this structure provides a striking transport signal of a 2D TSC. As a function of the sample width (or Fermi energy) the conductance resonances go through a sequence of 2e2/h (nontrivial phase) and 4e2/h plateaux (trivial phase) which fall within the region of a nonzero Chern number (2D limit) as the sample width becomes large. These signatures are a manifestation of the topological nature of the QSH effect and the TSC.",
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N1 - Funding information: We thank R.W. Reinthaler for helpful discussions. We acknowledge financial support by DFG Grants No. AS 327/5-1 and No. RE 2978/7-1, the SFB 1143 (project-id 247310070), the SFB 1170 ToCoTronics, the Würzburg-Dresden Cluster of Excellence ct.qmat (EXC 2147, project-id 39085490), and the DFG Excellence Strategy-EXC-2123 QuantumFrontiers-390837967.

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