Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Ultrafast Electron Dynamics I
O 57.5: Vortrag
Mittwoch, 19. März 2025, 11:45–12:00, H2
Theory of nonperturbative nonlinear transport in a Floquet-Weyl semimetal — •Juan Ignacio Aranzadi1, Matthew Day2, 3, James McIver2, 3, and Michael Sentef1, 2 — 1Institute for Theoretical Physics, University of Bremen/ Bremen Center for Computational Material Science, Bremen — 2Max Planck Institute for the Structure and Dynamics of Matter, CFEL, Hamburg — 3Department of Physics, Columbia University, New York, NY, USA
Weyl semimetals exhibit unique topological properties characterized by pairs of Weyl nodes with opposite chirality. While their transport properties have been extensively studied [1], their behavior under strong optical driving fields remains poorly understood. In this regime, the material response is governed by photon-dressed Floquet-Bloch states. Here, we investigate the photocurrent production mechanisms in Td-MoTe2, a type-II Weyl semimetal, under strong circularly polarized fields. Recent transport measurements in this material revealed a linear scaling of photocurrents at strong fields (<0.4 MV/cm) for the circular photogalvanic effect and the light-induced Hall effect [2]. We explore the microscopic theory underlying the photocurrent production in this system and disentangle its various contributing mechanisms. [1] J. Hu, S. Xu, N. Ni, Z. Mao, Annual Review of Materials Research (2019) 49:1, 207-252 [2] M. Day et. al. Nonperturbative nonlinear transport in a topological light-matter hybrid (2024)
Keywords: Weyl semimetal; Floquet theory; Light induced Hall effect; Circular photogalvanic effect; Ultrafast dynamics