Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 34: Topology: Solid State Systems

FM 34.2: Talk

Tuesday, September 24, 2019, 14:30–14:45, 1199

A fractional Weyl semimetal — Fabian Hotz¹, Apoorv Tiwari², Oguz Turker³, Tobias Meng³, Ady Stern⁴, •Maciej Koch-Janusz¹, and Titus Neupert² — ¹ETH Zurich, Switzerland — ²University of Zurich, Switzerland — ³TU Dresden, Germany — ⁴Weizmann Institute of Science, Israel

We construct an exactly solvable lattice model of a fractional Weyl semimetal (FWS). The low energy theory of this strongly interacting state is that of a Weyl semimetal built out of fractionally charged fermions. We show the existence of a universally quantized and fractional circular photogalvanic effect (CPGE) and a violation of the Wiedemann-Franz law in the system. Together with a spectral gap in the single-particle electronic Green's function they provide strong experimental signatures for this exotic gapless state of matter.