First-order transitions in spin chains coupled to quantum baths
- URL: http://arxiv.org/abs/2207.13782v1
- Date: Wed, 27 Jul 2022 20:42:08 GMT
- Title: First-order transitions in spin chains coupled to quantum baths
- Authors: C. A. Perroni, A. De Candia, V. Cataudella, R. Fazio, and G. De
Filippis
- Abstract summary: We show that tailoring the dissipative environment allows to change the features of continuous quantum phase transitions.
We find that spin couplings to local quantum boson baths in the Ohmic regime can drive the transition from the second to the first order even for a low dissipation strength.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We show that tailoring the dissipative environment allows to change the
features of continuous quantum phase transitions and, even, induce first order
transitions in ferromagnetic spin chains. In particular, using a numerically
exact quantum Monte Carlo method for the paradigmatic Ising chain of one-half
spins in a transverse magnetic field, we find that spin couplings to local
quantum boson baths in the Ohmic regime can drive the transition from the
second to the first order even for a low dissipation strength. Moreover, using
a variational mean-field approach for the treatment of spin-spin and spin-boson
interactions, we point out that phase discontinuities are ascribable to a
dissipation induced effective magnetic field which is intrinsically related to
the bath quantum fluctuations and vanishes for classical baths. The effective
field is able to switch the sign of the magnetization along the direction of
spin-spin interactions. The results can be potentially tested in recent quantum
simulators and are relevant for quantum sensing since the spin system could not
only detect the properties of non-classical baths, but also the effects of weak
magnetic fields.
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