Detection of Quantum Phase Boundary at Finite Temperatures in Integrable Spin Models.
| Autor: | Nandi P; Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700009, India., Bhattacharyya S; Department of Physics, Raja Rammohun Roy Mahavidyalaya, Radhanagar, Hooghly 712406, India., Dasgupta S; Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700009, India. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2022 Jun 17; Vol. 128 (24), pp. 247201. |
| DOI: | 10.1103/PhysRevLett.128.247201 |
| Abstrakt: | Quantum phase transitions occur when quantum fluctuation destroys order at zero temperature. With an increase in temperature, normally the thermal fluctuation wipes out any signs of this transition. Here, we identify a physical quantity that shows nonanalytic behavior at finite temperatures, when an interaction parameter is quenched across the line of quantum phase transition. This quantity under consideration is the long time limit of a form of quantum fidelity. Our treatment is analytic for XY chain and 2D Kitaev model and is numerical for a 3D Hamiltonian applicable to Weyl semimetals. |
| Databáze: | MEDLINE |
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