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• W1966205627 endingPage "37004" @default.
• W1966205627 startingPage "37004" @default.
• W1966205627 abstract "We study adiabatic quantum quenches across a quantum multicritical point (MCP) using a quenching scheme that enables the system to hit the MCP along different paths. We show that the power-law scaling of the defect density with the rate of driving depends non-trivially on the path, i.e., the exponent varies continuously with the parameter α that defines the path, up to a critical value α=αc; on the other hand for α⩾αc, the scaling exponent saturates to a constant value. We show that dynamically generated and path(α)-dependent effective critical exponents associated with the quasicritical points lying close to the MCP (on the ferromagnetic side), where the energy-gap is minimum, lead to this continuously varying exponent. The scaling relations are established using the integrable transverse XY spin chain and generalized to a MCP associated with a d-dimensional quantum many-body systems (not reducible to two-level systems) using adiabatic perturbation theory. We also calculate the effective path-dependent dimensional shift d0(α) (or the shift in center of the impulse region) that appears in the scaling relation for special paths lying entirely in the paramagnetic phase. The numerically obtained results are in good agreement with analytical predictions." @default.
• W1966205627 created "2016-06-24" @default.
• W1966205627 creator A5006644558 @default.
• W1966205627 creator A5085176201 @default.
• W1966205627 date "2010-11-01" @default.
• W1966205627 modified "2023-10-02" @default.
• W1966205627 title "Adiabatic multicritical quantum quenches: Continuously varying exponents depending on the direction of quenching" @default.
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• W1966205627 doi "https://doi.org/10.1209/0295-5075/92/37004" @default.
• W1966205627 hasPublicationYear "2010" @default.
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