Sub- to Super-Poissonian crossover of current noise in helical edge states coupled to a spin impurity in a magnetic field

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Benedikt Probst
  • Pauli Virtanen
  • Patrik Recher

Externe Organisationen

  • Technische Universität Braunschweig
  • University of Jyvaskyla
  • Laboratory for Emerging Nanometrology Braunschweig (LENA)
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Details

OriginalspracheEnglisch
Aufsatznummer085406
FachzeitschriftPhysical Review B
Jahrgang106
Ausgabenummer8
PublikationsstatusVeröffentlicht - 4 Aug. 2022
Extern publiziertJa

Abstract

Edge states of two-dimensional topological insulators are helical and single-particle backscattering is prohibited by time-reversal symmetry. In this work, we show that an isotropic exchange coupling of helical edge states (HES) to a spin 1/2 impurity subjected to a magnetic field results in characteristic backscattering current noise (BCN) as a function of bias voltage and tilt angle between the direction of the magnetic field and the quantization axis of the HES. In particular, we find transitions from sub-Poissonian (antibunching) to super-Poissonian (bunching) behavior as a direct consequence of the helicity of the edge state electrons. We use the method of full counting statistics within a master equation approach treating the exchange coupling between the spin-1/2 impurity and the HES perturbatively. We express the BCN via coincidence correlation functions of scattering processes between the HES which gives a precise interpretation of the Fano factor in terms of bunching and antibunching behavior of electron jump events. We also investigate the effect of electron-electron interactions in the HES in terms of the Tomonaga-Luttinger liquid theory.

ASJC Scopus Sachgebiete

Zitieren

Sub- to Super-Poissonian crossover of current noise in helical edge states coupled to a spin impurity in a magnetic field. / Probst, Benedikt; Virtanen, Pauli; Recher, Patrik.
in: Physical Review B, Jahrgang 106, Nr. 8, 085406, 04.08.2022.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Probst B, Virtanen P, Recher P. Sub- to Super-Poissonian crossover of current noise in helical edge states coupled to a spin impurity in a magnetic field. Physical Review B. 2022 Aug 4;106(8):085406. doi: 10.1103/PhysRevB.106.085406
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N1 - Funding information: P.V. acknowledges funding from EU's Horizon 2020 research, from the innovation program under Grant Agreement No. 800923 (SUPERTED) and from Academy of Finland Project No. 317118. P.R. acknowledges financial support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within the framework of Germany's Excellence Strategy–EXC-2123 QuantumFrontiers–390837967.

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N2 - Edge states of two-dimensional topological insulators are helical and single-particle backscattering is prohibited by time-reversal symmetry. In this work, we show that an isotropic exchange coupling of helical edge states (HES) to a spin 1/2 impurity subjected to a magnetic field results in characteristic backscattering current noise (BCN) as a function of bias voltage and tilt angle between the direction of the magnetic field and the quantization axis of the HES. In particular, we find transitions from sub-Poissonian (antibunching) to super-Poissonian (bunching) behavior as a direct consequence of the helicity of the edge state electrons. We use the method of full counting statistics within a master equation approach treating the exchange coupling between the spin-1/2 impurity and the HES perturbatively. We express the BCN via coincidence correlation functions of scattering processes between the HES which gives a precise interpretation of the Fano factor in terms of bunching and antibunching behavior of electron jump events. We also investigate the effect of electron-electron interactions in the HES in terms of the Tomonaga-Luttinger liquid theory.

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