Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Kevin A. Madsen
  • Piet W. Brouwer
  • Patrik Recher
  • Peter G. Silvestrov

Externe Organisationen

  • Freie Universität Berlin (FU Berlin)
  • Technische Universität Braunschweig
  • Laboratory for Emerging Nanometrology Braunschweig (LENA)
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Details

OriginalspracheEnglisch
Aufsatznummer115142
FachzeitschriftPhysical Review B
Jahrgang103
Ausgabenummer11
PublikationsstatusVeröffentlicht - 24 März 2021
Extern publiziertJa

Abstract

The interaction of a magnetic insulator with the helical electronic edge of a two-dimensional topological insulator has been shown to lead to many interesting phenomena. One of these is that for a suitable orientation of the magnetic anisotropy axis, the exchange coupling to an easy-plane magnet has no effect on DC electrical transport through a helical edge, despite the fact that it opens a gap in the spectrum of the helical edge [Meng, Phys. Rev. B 90, 205403 (2014)PRBMDO1098-012110.1103/PhysRevB.90.205403]. Here, we theoretically consider such a magnet embedded in an interferometer, consisting of a pair of helical edge states connected by two tunneling contacts, at which electrons can tunnel between the two edges. Using a scattering matrix approach, we show that the presence of the magnet in one of the interferometer arms gives rise to AC currents in response to an applied DC voltage. On the other hand, the DC Aharonov-Bohm effect is absent at zero temperature and small DC voltages, and only appears if the applied voltage or the temperature exceeds the magnet-induced excitation gap.

ASJC Scopus Sachgebiete

Zitieren

Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state. / Madsen, Kevin A.; Brouwer, Piet W.; Recher, Patrik et al.
in: Physical Review B, Jahrgang 103, Nr. 11, 115142, 24.03.2021.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Madsen KA, Brouwer PW, Recher P, Silvestrov PG. Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state. Physical Review B. 2021 Mär 24;103(11):115142. doi: 10.1103/PhysRevB.103.115142
Madsen, Kevin A. ; Brouwer, Piet W. ; Recher, Patrik et al. / Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state. in: Physical Review B. 2021 ; Jahrgang 103, Nr. 11.
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abstract = "The interaction of a magnetic insulator with the helical electronic edge of a two-dimensional topological insulator has been shown to lead to many interesting phenomena. One of these is that for a suitable orientation of the magnetic anisotropy axis, the exchange coupling to an easy-plane magnet has no effect on DC electrical transport through a helical edge, despite the fact that it opens a gap in the spectrum of the helical edge [Meng, Phys. Rev. B 90, 205403 (2014)PRBMDO1098-012110.1103/PhysRevB.90.205403]. Here, we theoretically consider such a magnet embedded in an interferometer, consisting of a pair of helical edge states connected by two tunneling contacts, at which electrons can tunnel between the two edges. Using a scattering matrix approach, we show that the presence of the magnet in one of the interferometer arms gives rise to AC currents in response to an applied DC voltage. On the other hand, the DC Aharonov-Bohm effect is absent at zero temperature and small DC voltages, and only appears if the applied voltage or the temperature exceeds the magnet-induced excitation gap.",
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N1 - Funding information: P.R. thanks Adrian Schneider for insightful discussions in an early stage of the project. We acknowledge financial support by the German Science Foundation (DFG) through Grants No. RE 2978/8-1 (P.S., P.R.) and No. BR 7074/4-1 (P.W.B.) and by project A02 of the CRC-TR 183 “entangled states of matter” (P.W.B., K.M.). P.R. and P.S. further acknowledge support from the DFG under Germany's Excellence Strategy, EXC-2123 QuantumFrontiers, 390837967.

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N2 - The interaction of a magnetic insulator with the helical electronic edge of a two-dimensional topological insulator has been shown to lead to many interesting phenomena. One of these is that for a suitable orientation of the magnetic anisotropy axis, the exchange coupling to an easy-plane magnet has no effect on DC electrical transport through a helical edge, despite the fact that it opens a gap in the spectrum of the helical edge [Meng, Phys. Rev. B 90, 205403 (2014)PRBMDO1098-012110.1103/PhysRevB.90.205403]. Here, we theoretically consider such a magnet embedded in an interferometer, consisting of a pair of helical edge states connected by two tunneling contacts, at which electrons can tunnel between the two edges. Using a scattering matrix approach, we show that the presence of the magnet in one of the interferometer arms gives rise to AC currents in response to an applied DC voltage. On the other hand, the DC Aharonov-Bohm effect is absent at zero temperature and small DC voltages, and only appears if the applied voltage or the temperature exceeds the magnet-induced excitation gap.

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