Febrero 17, 2023
Superconducting diode effect due to magnetochiral anisotropy in topological insulator and Rashba nanowires
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Date
Febrero 17, 2023
Featured speakers
Prof. Dr. Jelena Klinovaja
Deputy Co-Director of the NCCR SPIN
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Jelena Klinovaja received her Bachelor and Master degree in Applied Mathematics and Physics from the Moscow Institute of Physics and Technology (State University), Department of General and Applied Physics, in 2007 and 2009, resp, both with summa cum laude (5.0/5.0). Subsequently, she joined the group of Prof. Daniel Loss at the University of Basel, where she received her PhD in Theoretical Physics in 2012 with summa cum laude. In 2013, she was awarded a three-year Harvard Fellowship to perform independent research in the area of the theoretical quantum condensed matter physics. Klinovaja was appointed as a tenure track assistant professor at the Department of Physics at the University of Basel in 2014. In February 2019 she was tenured and promoted to associate professor. Since 2020, she is a Deputy Co-Director of the NCCR SPIN (National Centre of Competence in Research: Spin Qubits in Silicon). In her career, she was offered several prestigious fellowships (in 2013, Pappalardo Fellowship from MIT and Yale Prize Postdoctoral Fellowship) and received research prizes such as the Swiss Physical Society Prize 2013 in Condensed Matter Physics (sponsored by IBM), Prize of the Faculty of Natural Sciences, University of Basel, for best PhD work, and Camille- und Henry Dreyfus scholarship. In 2017, she was awarded the prestigious Starting Grant of the European Research Council (ERC). Later, in 2022, she was awarded the Consolidator Grant of the European Research Council (ERC).
The critical current of a superconductor can depend on the direction of current flow due to magnetochiral anisotropy when both inversion and time-reversal symmetry are broken, an effect known as the superconducting (SC) diode effect [1]. In our work, we consider one-dimensional (1D) systems in which superconductivity is induced via the proximity effect [2,3]. In both topological insulator and Rashba nanowires, the SC diode effect due to a magnetic field applied along the spin-polarization axis and perpendicular to the nanowire provides a measure of inversion symmetry breaking in the presence of a superconductor. Furthermore, a strong dependence of the SC diode effect on an additional component of magnetic field applied parallel to the nanowire as well as on the position of the chemical potential can be used to detect that a device is in the region of parameter space where the phase transition to topological superconductivity is expected to arise [3-6].
[1] H. Legg, D. Loss, and J. Klinovaja, Phys. Rev. B 106, 104501 (2022).
[2] H. Legg, D. Loss, and J. Klinovaja, Phys. Rev. B 104, 165405 (2021).
[3] H. Legg, D. Loss, and J. Klinovaja, Phys. Rev. B 105, 155413 (2022).
[4] R. Hess, H. Legg, D. Loss, and J. Klinovaja, arXiv:2210.03507.
[5] R. Hess, H. Legg, D. Loss, and J. Klinovaja, Phys. Rev. B 106, 104503 (2022).
[6] H. Legg, M. Rößler, F. Münning, D. Fan, O. Breunig, A. Bliesener, G. Lippertz, A. Uday, A. A. Taskin, D. Loss, J. Klinovaja, and Y. Ando, Nature Nanotechnology (2022).
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