Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-energy Spin Dynamics of Quantum Spin Liquid Candidate $NaYbSe_{2}$   The family of rare earth chalcogenides $ARECh_{2}$ (A = alkali or monovalent
ions, RE = rare earth, and Ch = O, S, Se, and Te) appears as an inspiring
playground for studying quantum spin liquids (QSL). The crucial low-energy spin
dynamics remain to be uncovered. By employing muon spin relaxation ($\mu$SR)
and zero-field (ZF) AC susceptibility down to 50 mK, we are able to identify
the gapless QSL in $NaYbSe_{2}$, a representative member with an effective
spin-1/2, and explore its unusual spin dynamics. The ZF $\mu$SR experiments
unambiguously rule out spin ordering or freezing in $NaYbSe_{2}$ down to 50 mK,
two orders of magnitude smaller than the exchange coupling energies. The spin
relaxation rate, $\lambda$, approaches a constant below 0.3 K, indicating
finite spin excitations featured by a gapless QSL ground state. This is
consistently supported by our AC susceptibility measurements. The careful
analysis of the longitudinal field (LF) $\mu$SR spectra reveals a strong
spatial correlation and a temporal correlation in the spin-disordered ground
state, highlighting the unique feature of spin entanglement in the QSL state.
The observations allow us to establish an experimental H-T phase diagram. The
study offers insight into the rich and exotic magnetism of the rare earth
family.

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The categories of this paper are: hep-lat
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The categories of this paper are: eess
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: stat
37
The categories of this paper are: supr-con
2
The categories of this paper are: math