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SUMMARY:Gunter M. Schütz (Institute of Biological Information Processing 
 and Institute for Advanced Simulation)
DTSTART:20210419T160000Z
DTEND:20210419T170000Z
DTSTAMP:20260423T024744Z
UID:QM3/46
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QM3/46/">Spi
 n helix states in the dissipative Heisenberg quantum spin chain</a>\nby Gu
 nter M. Schütz (Institute of Biological Information Processing and Instit
 ute for Advanced Simulation) as part of Quantum Matter meets Maths (IST\, 
 Lisbon)\n\n\nAbstract\nWe demonstrate that the exact nonequilibrium steady
  state of the one-dimensional Heisenberg $XXZ$ spin chain driven by bounda
 ry Lindblad operators can be constructed explicitly with a matrix product 
 ansatz for the nonequilibrium density matrix. For the isotropic Heisenberg
  chain\, polarized at the boundaries in different directions with a non-ze
 ro twist angle\, we calculate the exact magnetization profiles and magneti
 zation currents. The in-plane steady-state magnetization profiles are harm
 onic functions with a frequency proportional to the twist angle. In-plane 
 steady-state magnetization currents are subdiffusive and vanish as the bou
 ndary coupling strength increases\, while the transverse current is diffus
 ive and saturates as the coupling strength becomes large. The anisotropic 
 chain exhibits spin helix states at special values of the anisotropy where
  the transverse current is independent of system size\, even for non-integ
 rable higher-spin chains.\n
LOCATION:https://researchseminars.org/talk/QM3/46/
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