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SUMMARY:Ground-state phases of frustrated bilayer quantum Heisenberg antif
 erromagnets
DTSTART;VALUE=DATE-TIME:20181205T092500Z
DTEND;VALUE=DATE-TIME:20181205T094500Z
DTSTAMP;VALUE=DATE-TIME:20260316T202252Z
UID:indico-contribution-16@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Vasyl Baliha (Institute for Condensed Matter Physics
  of the NASU)\nWe consider the quantum antiferromagnetic Heisenberg model 
 on the square-lattice and honeycomb-lattice bilayers in the absence of an 
 external magnetic field. We use a variational approach to construct the gr
 ound-state phase diagrams of such model on different bilayers. For simplic
 ity\, we choose two one-parameter variational wave functions\, which can d
 escribe states of model in two regions with different relationships betwee
 n lattice parameters. We calculate variational energies and compare them. 
 This allows us to find borders between different states\, where one of the
  variational energies is minimal. Finally\, we construct ground-state phas
 e diagrams in different coordinates.  At the end of this study we compare 
 our findings with the earlier results obtained by more sophisticated appro
 aches [1\, 2]. We observe good agreement with these results. This studies 
 were performed together with O. Derzhko\, J. Richter and O. Götze.\n\n[1]
  H. Zhang et al.\, Phys. Rev. B 93\, 235150 (2016)\;\n[2] J. Stapmanns et 
 al.\, Phys. Rev. Lett. 121\, 127201 (2018).\n\nhttps://indico.bitp.kiev.ua
 /event/2/contributions/16/
LOCATION:
URL:https://indico.bitp.kiev.ua/event/2/contributions/16/
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