SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Poster: Correlated Electrons I

TT 42.13: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG2

Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe2 — •Stanislav Nikitin1, T. Xie2, A. A. Eberharter7, J. Xing2, S. Nishimoto3,4, M. Brando5, P. Khanenko5, J. Sichelschmidt5, A. A. Turrini1, D. G. Mazzone1, P. G. Naumov1, L. D. Sanjeewa2, A. S. Sefat2, B. Normand1,6, A. M. Lauchli1,6, and A. Podlesnyak21Paul Scherrer Institut, Switzerland — 2Oak Ridge National Laboratory, USA — 3TU Dresden, Germany — 4IFW, Germany — 5MPI CPfS, Germany — 6EPFL, Switzerland — 7Universitat Innsbruck, Austria

The spin 1/2 triangular lattice Heisenberg antiferromagnet remains on of the most attractive models to explore highly entangled quantum spin states in proximity to magnetic order. In my presentation I will discuss our recent results on CsYbSe2. This materials exhibits strong two-dimensional magnetic behavior in absence of exchange and structural disorder and its spin Hamiltonian is well described by J1J2 AFM Heisenberg model. We performed comprehensive INS measurements over the whole field scale starting from zero field up to the saturation and observed that corresponding excitation spectra evolve from continuum-like to relatively sharp spin-wave modes in the up-up-down phase, then back to continua and back to spin waves. We further support our observation by cylinder MPS calculation, which reproduce all observed features with semi-quantitative accuracy. Thus our comprehensive experimental and theoretical analysis of the field-induced spin excitations in the CsYbSe2 provides valuable insight into the dynamics of a broad class of quantum many-body systems.

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