Fractionalized Excitations in Quantum Spin Liquids

by Kang Wang (Institute of Physics, Chinese Academy of Sciences)

Tuesday 19 Nov 2024, 13:00 → 14:00 Europe/Berlin

Quantum spin liquids (QSLs) are long-range entangled states of matter characterized by fractionalized degrees of freedom. The direct experimental detection of these fractionalized particles remains a substantial challenge. Based on the single-mode approximation iPEPS algorithm, we investigated the spin dynamics in the Kitaev honeycomb model under an out-of-plane magnetic field, a system exhibits a transition from a gapped chiral spin liquid (CSL) phase to a debated gapless phase. In the first part of the talk, I will identify experimentally detectable signatures of fractionalized excitations in the chiral spin liquid phase, where the flux and Majorana fermion freedoms are separable. In the second segment, I will address the gapless excitations under moderate field. We proposed a theoretical mechanism for the emergence of the gapless phase, where the proliferating $\pi-$fluxes create an emergent Majorana metallic state with a `Fermi surface' at zero energy.

Zoom Meeting
https://desy.zoom.us/j/64303953515

Meeting-ID: 643 0395 3515
Kenncode: 417643