Kibble-Zurek Behavior in Disordered Chern Insulators

Ulčakar, Lara; Mravlje, Jernej; Rejec, T.

doi:10.1103/physrevlett.125.216601

Cited by 20 publications

(16 citation statements)

References 73 publications

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“…Following the recent study of Kibble-Zurek behavior in disordered Chern insulators [68], we utilize the spatial excitation density as a physical observable and extract the correlation length scale from the spatial autocorrelation function. The operator for the excitation density is the projector onto the positive energy bands of the final Hamiltonian H(t f ), viz.…”

Section: Numerical Demonstration Of Spatial Scalingmentioning

confidence: 99%

Decoherent quench dynamics across quantum phase transitions

et al. 2021

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We present a formulation for investigating quench dynamics across quantum phase transitions in the presence of decoherence. We formulate decoherent dynamics induced by continuous quantum non-demolition measurements of the instantaneous Hamiltonian. We generalize the well-studied universal Kibble-Zurek behavior for linear temporal drive across the critical point. We identify a strong decoherence regime wherein the decoherence time is shorter than the standard correlation time, which varies as the inverse gap above the groundstate. In this regime, we find that the freeze-out time \bar{t}\sim\tau^{{2\nu z}/({1+2\nu z})}t-∼τ2νz/(1+2νz) for when the system falls out of equilibrium and the associated freeze-out length \bar{\xi}\sim\tau^{\nu/({1+2\nu z})}ξ‾∼τν/(1+2νz) show power-law scaling with respect to the quench rate 1/\tau1/τ, where the exponents depend on the correlation length exponent \nuν and the dynamical exponent zz associated with the transition. The universal exponents differ from those of standard Kibble-Zurek scaling. We explicitly demonstrate this scaling behavior in the instance of a topological transition in a Chern insulator system. We show that the freeze-out time scale can be probed from the relaxation of the Hall conductivity. Furthermore, on introducing disorder to break translational invariance, we demonstrate how quenching results in regions of imbalanced excitation density characterized by an emergent length scale which also shows universal scaling. We perform numerical simulations to confirm our analytical predictions and corroborate the scaling arguments that we postulate as universal to a host of systems.

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Section: Numerical Demonstration Of Spatial Scalingmentioning

confidence: 99%

Decoherent quench dynamics across quantum phase transitions

et al. 2021

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show abstract

“…Following the recent study of Kibble-Zurek behavior in disordered Chern insulators 65 , we utilize the spatial excitation density as a physical observable and extract the correlation length scale from the spatial autocorrelation function. The operator for the excitation density is the projector onto the positive energy bands of the final Hamiltonian H(t f ), viz.…”

Section: F Numerical Demonstration Of Spatial Scalingmentioning

confidence: 99%

Decoherent Quench Dynamics across Quantum Phase Transitions

Kuo¹,

Arovas²,

Vishveshwara³

et al. 2021

Preprint

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We present a formulation for investigating quench dynamics across quantum phase transitions in the presence of decoherence. We formulate decoherent dynamics induced by continuous quantum non-demolition measurements of the instantaneous Hamiltonian. We generalize the well-studied universal Kibble-Zurek behavior for linear temporal drive across the critical point. We identify a strong decoherence regime wherein the decoherence time is shorter than the standard correlation time, which varies as the inverse gap above the groundstate. In this regime, we find that the freeze-out time t ∼ τ 2νz/(1+2νz) for when the system falls out of equilibrium and the associated freeze-out length ξ ∼ τ ν/(1+2νz) show power-law scaling with respect to the quench rate 1/τ , where the exponents depend on the correlation length exponent ν and the dynamical exponent z associated with the transition. The universal exponents differ from those of standard Kibble-Zurek scaling. We explicitly demonstrate this scaling behavior in the instance of a topological transition in a Chern insulator system. We show that the freeze-out time scale can be probed from the relaxation of the Hall conductivity. Furthermore, on introducing disorder to break translational invariance, we demonstrate how quenching results in regions of imbalanced excitation density characterized by an emergent length scale which also shows universal scaling. We perform numerical simulations to confirm our analytical predictions and corroborate the scaling arguments that we postulate as universal to a host of systems.

show abstract

“…Following the recent study of Kibble-Zurek behavior in disordered Chern insulators [63], we utilize the spatial excitation density as a physical observable and extract the correlation length scale from the spatial autocorrelation function. The operator for the excitation density is the projector onto the positive energy bands of the final Hamiltonian H(t f ), viz.…”

Section: Numerical Demonstration Of Spatial Scalingmentioning

confidence: 99%

Report on scipost_202105_00009v1

Dutta¹

2021

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Kibble-Zurek Behavior in Disordered Chern Insulators

Cited by 20 publications

References 73 publications

Decoherent quench dynamics across quantum phase transitions

Decoherent quench dynamics across quantum phase transitions

Decoherent Quench Dynamics across Quantum Phase Transitions

Report on scipost_202105_00009v1

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