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- W3094061279 abstract "The lack of methods to experimentally detect and quantify entanglement in quantum matter impedes our ability to identify materials hosting highly entangled phases, such as quantum spin liquid states. We thus investigate the feasibility of using inelastic neutron scattering (INS) experiments to evaluate three entanglement witnesses: one-tangle, two-tangle, and quantum Fisher information (QFI). We report high-resolution INS data on Cs$_2$CoCl$_4$ and comparisons with zero-temperature density-matrix renormalization group (DMRG) results for the $S=1/2$ XXZ spin chain with a transverse magnetic field. As the field strength increases, this system passes through two quantum critical points of different universality classes, as well as a classical point. Consequently, the entanglement can be tuned by simply changing the magnetic field. Using DMRG we calculate properties of the ground state and the first two excited states, as well as the dynamical spin structure factor as functions of the field strength. The entanglement entropy serves as a theoretical, wave-function based measure of entanglement. We contrast its behavior with that of the tangles and QFI. We show that QFI represents a viable route to experimental entanglement quantification for weak to intermediate fields." @default.
- W3094061279 created "2020-10-29" @default.
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- W3094061279 date "2020-10-21" @default.
- W3094061279 modified "2023-10-17" @default.
- W3094061279 title "Dynamics, Entanglement, and the Classical Point in the Transverse-Field XXZ Chain Cs$_2$CoCl$_4$" @default.
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