Amplified entanglement witnessed in a quantum critical metal
arxiv(2024)
Abstract
Strong correlations in matter promote a landscape of ground states and the
associated quantum critical points. For metallic systems, there is increasing
recognition that the quantum criticality goes beyond the standard Landau
framework and, thus, novel means are needed to characterize the quantum
critical fluid. Here we do so by studying the entanglement properties near a
quantum critical point of a strongly correlated metal. We calculate the mutual
information and quantum Fisher information of an Anderson/Kondo lattice model
across its Kondo destruction quantum critical point, with the former measuring
the bipartite entanglement between two subsystems and the latter serving as
witness for multipartite entanglement in the entire system. The mutual
information between the conduction electrons and local moments reveals a
dynamical effect of Kondo correlations across the quantum critical point.
Moreover, the quantum Fisher information of the spin degree of freedom peaks at
the quantum critical point and indicates a strongly entangled ground state. Our
work opens a new avenue to advance the understanding of metallic quantum
criticality by entanglement means in a broad range of strongly correlated
systems, and reveals a new regime of quantum matter to witness amplified
entanglement.
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