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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. Nishimoto^3,4, M. Brando⁵, P. Khanenko⁵, J. Sichelschmidt⁵, A. A. Turrini¹, D. G. Mazzone¹, P. G. Naumov¹, L. D. Sanjeewa², A. S. Sefat², B. Normand^1,6, A. M. Lauchli^1,6, and A. Podlesnyak² — ¹Paul 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 J₁–J₂ 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.