Berlin 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 81: Frustrated Magnets: General II
TT 81.2: Talk
Thursday, March 21, 2024, 16:45–17:00, H 2053
Signatures of Domain-Wall Confinement in Raman Spectroscopy of Ising Spin Chains — •Stefan Birnkammer1,2, Johannes Knolle1,2,3, and Michael Knap1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany — 3Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
Mesonic bound states of domain walls can be stabilized in quasi one-dimensional magnetic compounds. Here, we theoretically study the Raman light scattering response of a twisted Kitaev chain with tilted magnetic fields as a minimal model for confinement in CoNb2O6. By both numerical matrix product states and few-domain wall variational states, we show that confinement-induced bound states directly manifest themselves as sharp peaks in the Raman response. Near quantum criticality the Raman spectrum exhibit the famous E8 symmetry. Remarkably, by tuning the polarization of the incident light field, we demonstrate that the Raman response offers new insights into the intrinsic structure of the bound state wavefunction.
Keywords: Raman Spectroscopy; Spinon Confinement; Ising Chains