Titel | Referent | Datum | Ort |
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Gemeinsames TKM-TFP Seminar | Garst, Mirlin, Rockstuhl, Schmalian, Shnirman |
Montag, 14.00-15.30 Uhr |
10-01 |
TFP Institutsseminar | Garst, Rockstuhl |
Dienstag, 13.00-14.00 Uhr |
10-01 |
IQMT Seminar | Campus Nord, Geb. 425 |
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Physikalisches Kolloquium | Freitag, 15.45-17.15 Uhr |
Lehmann HS |
Seminar über Theoretische Festkörperphysik |
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Vortragender: | Sarang Gopalakrishnan |
Datum: | 25.05.2020 14:00 |
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Ort: | This seminar will take place as an online event. |
Zugehörigkeit: | City University of New York, USA |
Gastgeber: | Prof. Dr. Alexander Mirlin |
Abstract
The XXZ spin chain is a canonical model of one-dimensional quantum magnetism. We consider spin transport at nonzero temperature in this model. Spin transport is ballistic in the easy-plane regime, diffusive in the easy-axis regime, and superdiffusive at the isotropic Heisenberg point. Energy transport, by contrast, is ballistic in all cases. The framework of generalized hydrodynamics offers an elementary explanation of these phenomena [1] in terms of the quasiparticle content of the XXZ model. It also predicts new transport anomalies, e.g., in local relaxation in the easy-axis regime in the presence of a magnetic field [2], and in the a.c. conductivity in the easy-plane regime [3]. These anomalies come from the asymptotic behavior of large semiclassical bound states of many quasiparticles [4], as we will discuss.
[1] SG, R. Vasseur, PRL 122, 127202 (2019) [2] SG, R. Vasseur, B. Ware, PNAS 116, 16250 (2019) [3] U. Agrawal, SG, R. Vasseur, and B. Ware, arXiv:1909.05263 [4] J. De Nardis, SG, E. Ilievski, and R. Vasseur, arXiv:2003.13708