Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: 2D Materials II – Electronic and Transport Properties (joint session HL/TT)

TT 20.2: Vortrag

Montag, 9. März 2026, 15:15–15:30, POT/0081

Tomographic flow regime in the 2D Corbino disk geometry — •Grigorii Starkov — Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany

2D materials offer a unique test ground to study electron transport regimes dominated by the electron-electron collisions. This makes them the perfect platform to observe the electron hydrodynamic flows.

Not so long ago, it has been realized that precisely in 2D, the electron collisions constrained due to Pauli blocking result in the appearance of the long lived collective modes with odd angular character. The corresponding novel transport regime has been dubbed "tomographic".

In the recent experiment [2], magnetoresistance in Corbino-shaped graphene devices was used to disentangle different contributions to the electron transport and to determine viscosity. The obtained temperature-dependence thereof has been linked to the tomographic flow. However, the analysis is based on the bulk expressions for the conductivity and does not treat boundary corrections in detail. At the same time, boundary layers have been shown to be anomalously large in the tomographic flow regime [3].

To take into account the boundary effects, I analyze the magnetoresistance in the 2D Corbino disk geometry across different regimes, using the linearized Boltzmann equation.

[1] P. Ledwith et al, Phys. Rev. Lett. 123, 116601 (2019) [2] Y. Zeng et al, arXiv:2407.05026 (2025) [3] N. Ben-Schachar, J. Hoffmann, arXiv:2503.14431 (2025)

Keywords: electron transport; tomographic flow regime; pauli blocking; corbino disk geometry