Quantum criticality of the Ohmic spin-boson model in a high dense
spectrum: symmetries,quantum fluctuations and correlations
- URL: http://arxiv.org/abs/2106.07810v1
- Date: Mon, 14 Jun 2021 23:55:39 GMT
- Title: Quantum criticality of the Ohmic spin-boson model in a high dense
spectrum: symmetries,quantum fluctuations and correlations
- Authors: Xiaohui Qian, Congzhi Zeng, Nengji Zhou
- Abstract summary: Study of dissipative quantum phase transitions in the Ohmic spin-boson model is numerically challenging in a dense limit of environmental modes.
Large-scale numerical simulations are carried out based on the variational principle.
- Score: 0.966840768820136
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Study of dissipative quantum phase transitions in the Ohmic spin-boson model
is numerically challenging in a dense limit of environmental modes. In this
work, large-scale numerical simulations are carried out based on the
variational principle. The validity of variational calculations, spontaneous
breakdown of symmetries, and quantum fluctuations and correlations in the Ohmic
bath are carefully analyzed, and the critical coupling as well as exponents are
accurately determined in the weak tunneling and continuum limits. In addition,
quantum criticality of the Ohmic bath is uncovered both in the delocalized
phase and at the transition point.
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