Starts 18 Jul 2024 11:00
Ends 18 Jul 2024 12:00
Central European Time
CMSP Seminar (Joint ICTP/SISSA Statistical Physics): Boundary states in flakes of two-dimensional second-order topological insulators
Leonardo Building, Luigi Stasi Seminar Room (and via Zoom)
Michele Governale
(Victoria University of Wellington)
Abstract:
Two-dimensional second-order topological insulators are characterized by the presence of topologically protected zero-energy states localized at the corners of a flake [1].
We consider two different models of second-order topological insulators, both belonging to Cartan class AIII [2]. We discuss how the location and properties of the corner states can be controlled, for example by rotating an in-plane magnetic field or by changing the orientation of the flake with respect to the crystal axes.
Finally, we study multi-terminal electronic transport through a flake of second-order topological insulator. We show that these types of systems can implement topological nano-switches. We find that the switching functionality is remarkably robust to the presence of strong disorder stemming from the topological nature of the states contributing to the electron transport.
We consider two different models of second-order topological insulators, both belonging to Cartan class AIII [2]. We discuss how the location and properties of the corner states can be controlled, for example by rotating an in-plane magnetic field or by changing the orientation of the flake with respect to the crystal axes.
Finally, we study multi-terminal electronic transport through a flake of second-order topological insulator. We show that these types of systems can implement topological nano-switches. We find that the switching functionality is remarkably robust to the presence of strong disorder stemming from the topological nature of the states contributing to the electron transport.
[1] B. Xie, H.-X. Wang, X. Zhang, P. Zhan, J.-H. Jiang, M. Lu, and Y. Chen, Nat. Rev. Phys. 3, 520 (2021).
[2] J. Poata, F. Taddei, and M. Governale, Phys. Rev. B 108, 115405 (2023).
[3] J. Poata, F. Taddei, and M. Governale, New J. Phys. 26, 053038 (2024).