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X-ORIGINAL-URL:https://ktfa.science.upjs.sk/
X-WR-CALNAME:Department of Theoretical Physics and Astrophysics
X-WR-CALDESC:Pavol Jozef Šafárik University in Košice
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BEGIN:VEVENT
CLASS:PUBLIC
UID:MEC-b6e8cb5c4ccebe66e4478c1622f904eb@ktfa.science.upjs.sk
DTSTART:20211216T123000Z
DTEND:20211216T133000Z
DTSTAMP:20211206T091400Z
CREATED:20211206
LAST-MODIFIED:20211214
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Nature of disordered phase of the frustrated spin-1/2 Ising-Heisenberg model on martini lattices
DESCRIPTION:Hamid Arianzad\nDepartment of Theoretical Physics and Astrophysics, Institute of Physics, UPJŠ\nIn this work, we have exactly solved the spin-1/2 Ising-Heisenberg model on two new geometrically related martini lattices using the generalized star-triangle transformation which establishes an exact mapping relationship to the effective spin-1/2 Ising model on a triangular lattice. The investigated quantum spin models exhibit in the ground-state phase diagram three different phases: the classical ferromagnetic phase, the quantum ferromagnetic and a quantum disordered phases. In opposite to the classical ferromagnetic long-range ordering spontaneous magnetization of Heisenberg and Ising spins show within the long-range ordered quantum ferromagnetic phase a quantum reduction. The classical and quantum ferromagnetic phases coexist together with the quantum disordered phase at an intriguing triple point around which one observes anomalous magnetic and thermodynamic behaviors. It is evidenced that the spontaneous magnetizations and the logarithmic divergence of the specific heat disappear within the parameter regions corresponding to the disordered quantum phase.\nONLINE LINK ( https://teams.microsoft.com/l/meetup-join/19%3aef8d9658c1ce44649006efb21962985c%40thread.tacv2/1638785600475?context=%7b%22Tid%22%3a%22f5b68cf2-035b-428d-87f6-f7384161306d%22%2c%22Oid%22%3a%22ebaa6932-5b48-48fc-9f1d-6a5a0538ee17%22%7d )\n
URL:https://ktfa.science.upjs.sk/events/nature-of-disordered-phase-of-the-frustrated-spin-1-2-ising-heisenberg-model-on-martini-lattices/
CATEGORIES:KTFA seminar
LOCATION:online
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