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[Fizinfo] BME Elméleti Fizika Tanszék szemináriuma

Chronological Thread 
  • From: tcsaba <tcsaba AT>
  • To: fizinfo AT
  • Subject: [Fizinfo] BME Elméleti Fizika Tanszék szemináriuma
  • Date: Tue, 19 Dec 2017 13:52:13 +0100

M E G H Í V Ó - I N V I T A T I O N

Seminar Series of the Department of Theoretical Physics at the
Budapest University of Technology and Economics

Judit Romhányi
(Okinawa Institute of Science and Technology )

Chernful multiplet excitations in the breathing kagome model

We study the topologically nontrivial multiplet excitations of the antiferromagnetic spin-1/2 kagome system with breathing anisotropy. We show that in the chiral magnetic ground state the excitations can be characterized by a low-energy spin-1/2 doublet and a high-energy spin-3/2 quartet. A small magnetic field removes the degeneracy of the multiplets and the excitations become topologically nontrivial with Chern numbers C_m = 2m, the spin-3/2 manifold thus having large Chern numbers -3, -1, 1, 3. Increasing the magnetic field above a critical point, the bands undergo a topological transition when a novel spin-3/2 Dirac cone is formed by the touching of four bands. Above the critical field the bands become trivial. Before a similar topological transition occurred for the lower spin-1/2 doublet, at a higher magnetic field value, a conventional symmetry breaking transition takes place to the 1/3-plateau phase in which all bands are topologically trivial.

Időpont: 2017. december 22. péntek, 10:15
Helyszín: BME Fizikai Intézet, Elméleti Fizika Tanszék,
Budafoki út 8. F-épület, III lépcsőház, szemináriumi szoba

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