We show in a simple exactly solvable toy model that a properly designed impulse perturbation can transiently cool down low-energy degrees of freedom at the expense of high-energy ones that heat up. The model consists of two infinite-range quantum Ising models: one, the high-energy sector, with a transverse field much bigger than the other, the low-energy sector. The finite-duration perturbation is a spin exchange that couples the two Ising models with an oscillating coupling strength. We find a cooling of the low-energy sector that is optimized by the oscillation frequency in resonance with the spin exchange excitation. After the perturbation is turned off, the Ising model with a low transverse field can even develop a spontaneous symmetry breaking despite being initially above the critical temperature.

Selective Transient Cooling by Impulse Perturbations in a Simple Toy Model / Fabrizio, Michele. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 120:22(2018), pp. 1-5. [10.1103/PhysRevLett.120.220601]

Selective Transient Cooling by Impulse Perturbations in a Simple Toy Model

Fabrizio, Michele
2018

Abstract

We show in a simple exactly solvable toy model that a properly designed impulse perturbation can transiently cool down low-energy degrees of freedom at the expense of high-energy ones that heat up. The model consists of two infinite-range quantum Ising models: one, the high-energy sector, with a transverse field much bigger than the other, the low-energy sector. The finite-duration perturbation is a spin exchange that couples the two Ising models with an oscillating coupling strength. We find a cooling of the low-energy sector that is optimized by the oscillation frequency in resonance with the spin exchange excitation. After the perturbation is turned off, the Ising model with a low transverse field can even develop a spontaneous symmetry breaking despite being initially above the critical temperature.
120
22
1
5
220601
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.220601
https://arxiv.org/abs/1801.06622
Fabrizio, Michele
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/82737
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