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• W2989164083 abstract "We study ground-state quantum entanglement in the one-dimensional Bose-Hubbard model in the presence of a harmonic trap. We focus on two transitions that occur upon increasing the characteristic particle density: the formation of a Mott-insulating domain with site occupation one at the center of the trap (lower transition) and the emergence of a superfluid domain at the center of the Mott-insulating one (upper transition). These transitions generate discontinuities in derivatives of the total energy and have been characterized by local (nonextensive) order parameters, so we refer to them as local quantum phase transitions. We show that a second derivative of the total energy is continuous with a kink at the lower transition, and that it is discontinuous at the upper transition. We also show that bipartite entanglement entropies are order parameters for those local quantum phase transitions. We use the density-matrix renormalization group and show that the transition points extracted from entanglement measures agree with the predictions of the local density approximation in the thermodynamic limit. We discuss how to determine the transition points from results in small systems, such as the ones realized in recent optical lattice experiments that measured the second-order Renyi entanglement entropy." @default.
• W2989164083 created "2019-11-22" @default.
• W2989164083 creator A5027007474 @default.
• W2989164083 creator A5048914591 @default.
• W2989164083 creator A5057710897 @default.
• W2989164083 date "2019-11-13" @default.
• W2989164083 modified "2023-10-08" @default.
• W2989164083 title "Information measures for local quantum phase transitions: Lattice bosons in a one-dimensional harmonic trap" @default.
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• W2989164083 doi "https://doi.org/10.1103/physreva.100.053611" @default.
• W2989164083 hasPublicationYear "2019" @default.
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