Collective modes at a disordered quantum phase transition. PUSCHMANN, Martin; CREWSE, Jack; HOYOS, José Abel; VOJTA, Thomas.
Abstract: We study the collective excitations, i.e., the Goldstone (phase) mode and the Higgs (amplitude) mode, near the superfluid-Mott glass quantum phase transition in a two-dimensional system of disordered bosons. Using Monte Carlo simulations as well as an inhomogeneous quantum mean-field theory with Gaussian fluctuations, we show that the Higgs mode is strongly localized for all energies, leading to a noncritical scalar response. In contrast, the lowest-energy Goldstone mode undergoes a striking delocalization transition as the system enters the superfluid phase. We discuss the generality of these findings and experimental consequences, and we point out potential relations to many-body localization.
Physical Review Letters
v. 125, n. 2, p. 027002-1-027002-6 - Ano: 2020
Fator de Impacto: 8,385
@article={003000806,author = {PUSCHMANN, Martin; CREWSE, Jack; HOYOS, José Abel; VOJTA, Thomas.},title={Collective modes at a disordered quantum phase transition},journal={Physical Review Letters},note={v. 125, n. 2, p. 027002-1-027002-6},year={2020}}
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Abstract: We study the collective excitations, i.e., the Goldstone (phase) mode and the Higgs (amplitude) mode, near the superfluid-Mott glass quantum phase transition in a two-dimensional system of disordered bosons. Using Monte Carlo simulations as well as an inhomogeneous quantum mean-field theory with Gaussian fluctuations, we show that the Higgs mode is strongly localized for all energies, leading to a noncritical scalar response. In contrast, the lowest-energy Goldstone mode undergoes a striking delocalization transition as the system enters the superfluid phase. We discuss the generality of these findings and experimental consequences, and we point out potential relations to many-body localization.
@article={003000806,author = {PUSCHMANN, Martin; CREWSE, Jack; HOYOS, José Abel; VOJTA, Thomas.},title={Collective modes at a disordered quantum phase transition},journal={Physical Review Letters},note={v. 125, n. 2, p. 027002-1-027002-6},year={2020}}