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• W2891056110 abstract "We study quantum phase transitions in transverse-field Ising spin chains in which the couplings are random but hyperuniform, in the sense that their large-scale fluctuations are suppressed. We construct a one-parameter family of disorder models in which long-wavelength fluctuations are increasingly suppressed as a parameter $alpha$ is tuned. For $alpha = 0$, one recovers the familiar infinite-randomness critical point. For $0 < alpha < 1$, we find a line of infinite-randomness critical points with continuously varying critical exponents; however, the Griffiths phases that flank the critical point at $alpha = 0$ are absent at any $alpha > 0$. When $alpha > 1$, randomness is a dangerously irrelevant perturbation at the clean Ising critical point, leading to a state we call the critical Ising insulator. In this state, thermodynamics and equilibrium correlation functions behave as in the clean system. However, all finite-energy excitations are localized, thermal transport vanishes, and autocorrelation functions remain finite in the long-time limit. We characterize this line of hyperuniform critical points using a combination of perturbation theory, renormalization-group methods, and exact diagonalization." @default.
• W2891056110 created "2018-09-27" @default.
• W2891056110 creator A5003818762 @default.
• W2891056110 creator A5056107519 @default.
• W2891056110 creator A5063560555 @default.
• W2891056110 date "2019-10-17" @default.
• W2891056110 modified "2023-10-09" @default.
• W2891056110 title "Quantum criticality in Ising chains with random hyperuniform couplings" @default.
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• W2891056110 doi "https://doi.org/10.1103/physrevb.100.134206" @default.
• W2891056110 hasPublicationYear "2019" @default.
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