Sub- to super-Poissonian crossover of current noise in helical edge states coupled to a spin impurity in a magnetic field
Probst, B., Virtanen, P., & Recher, P. (2022). Sub- to super-Poissonian crossover of current noise in helical edge states coupled to a spin impurity in a magnetic field. Physical Review B, 106(8), Article 085406. https://doi.org/10.1103/PhysRevB.106.085406
Published inPhysical Review B
DisciplineNanoscience CenterNanoscience Center
©2022 American Physical Society
Edge states of two-dimensional topological insulators are helical and single-particle backscattering is prohibited by time-reversal symmetry. In this paper, 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. ...
PublisherAmerican Physical Society (APS)
ISSN Search the Publication Forum2469-9950
Publication in research information system
MetadataShow full item record
Related funder(s)European Commission; Academy of Finland
Funding program(s)Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingP.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.
Showing items with similar title or keywords.
Application of time-dependent many-body perturbation theory to excitation spectra of selected finite model systems Säkkinen, Niko (University of Jyväskylä, 2016)In this thesis, an approximate method introduced to solve time-dependent many-body problems known as time-dependent many-body perturbation theory is studied. Many-body perturbation theory for interacting electrons and ...
Rippling of two-dimensional materials by line defects Kähärä, Topi; Koskinen, Pekka (American Physical Society (APS), 2020)Two-dimensional materials and their mechanical properties are known to be profoundly affected by rippling deformations. However, although ripples are fairly well understood, less is known about their origin and controlled ...
Reply to : “Topological and trivial domain wall states in engineered atomic chains” Huda, Md Nurul; Kezilebieke, Shawulienu; Ojanen, Teemu; Drost, Robert; Liljeroth, Peter (Nature Publishing Group, 2022)
Acoustic wave tunneling across a vacuum gap between two piezoelectric crystals with arbitrary symmetry and orientation Geng, Zhuoran; Maasilta, Ilari J. (American Physical Society (APS), 2022)It is not widely appreciated that an acoustic wave can “jump” or “tunnel” across a vacuum gap between two piezoelectric solids, nor has the general case been formulated or studied in detail. Here, we remedy that situation, ...
Effective medium theory for the low-temperature heat capacity of a metasolid plate Puurtinen, Tuomas, A.; Maasilta, Ilari, J. (Nature Publishing Group, 2023)Nanopatterning can be used to strongly control the thermal properties of solids, but theoretical understanding relies often on complex numerical simulations. Here, an analytical theory is derived for the low temperature ...