Year: 2020
Type: article
Abstract: We calculate the critical exponents of the threshold singularity for the spectral density of the XXZ-spin chain at zero magnetic field for the lower threshold. We show that the corresponding phase shifts are momentum independent and coincide with predictions of the effective mobile impurity Hamiltonian approach.
Source: Modern Physics Letters B
Author: A. A. Ovchinnikov
Institution: Institute for Nuclear Research
Language: English
Topic: Quantum many-body systems
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Russian Academy of Sciences
OpenAlex ID: W3019190102