Noise in the Helical Edge Channel Anisotropically Coupled to a Local Spin
- Autores: Nagaev K.E.1, Remizov S.V.1,2, Shapiro D.S.1,2
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Afiliações:
- Kotelnikov Institute of Radioengineering and Electronics
- All-Russia Research Institute of Automatics (VNIIA)
- Edição: Volume 108, Nº 10 (2018)
- Páginas: 664-669
- Seção: Condensed Matter
- URL: https://journals.rcsi.science/0021-3640/article/view/161275
- DOI: https://doi.org/10.1134/S002136401822006X
- ID: 161275
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Resumo
We calculate the frequency-dependent shot noise in the edge states of a two-dimensional topological insulator coupled to a magnetic impurity with spin S = 1/2 of arbitrary anisotropy. If the anisotropy is absent, the noise is purely thermal at low frequencies, but tends to the Poisson noise of the full current I at high frequencies. If the interaction only flips the impurity spin but conserves those of electrons, the noise at high voltages eV ≫ T is frequency-independent. Both the noise and the backscattering current Ibs saturate at voltageindependent values. Finally, if the Hamiltonian contains all types of non-spin-conserving scattering, the noise at high voltages becomes frequency-dependent again. At low frequencies, its ratio to 2eIbs is larger than 1 and may reach 2 in the limit Ibs→0. At high frequencies, it tends to 1.
Sobre autores
K. Nagaev
Kotelnikov Institute of Radioengineering and Electronics
Autor responsável pela correspondência
Email: nag@cplire.ru
Rússia, Moscow, 125009
S. Remizov
Kotelnikov Institute of Radioengineering and Electronics; All-Russia Research Institute of Automatics (VNIIA)
Email: nag@cplire.ru
Rússia, Moscow, 125009; Moscow, 127055
D. Shapiro
Kotelnikov Institute of Radioengineering and Electronics; All-Russia Research Institute of Automatics (VNIIA)
Email: nag@cplire.ru
Rússia, Moscow, 125009; Moscow, 127055
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