Stochastic parameter optimization analysis of dynamical quantum critical phenomena in long-range transverse-field Ising chain
- URL: http://arxiv.org/abs/2305.14121v3
- Date: Tue, 23 Jul 2024 07:55:55 GMT
- Title: Stochastic parameter optimization analysis of dynamical quantum critical phenomena in long-range transverse-field Ising chain
- Authors: Sora Shiratani, Synge Todo,
- Abstract summary: We explore the quantum phase transition of the one-dimensional long-range transverse-field Ising model.
In our simulations, the simulator automatically determines the parameters to sample from, even without prior knowledge of the critical point and universality class.
We successfully determine the universality boundary between the latter two as $sigma = 7/4$ based on the dynamical exponent.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The quantum phase transition of the one-dimensional long-range transverse-field Ising model is explored by combining the quantum Monte Carlo method and stochastic parameter optimization, specifically achieved by tuning correlation ratios so that space and imaginary time are isotropic. In our simulations, the simulator automatically determines the parameters to sample from, even without prior knowledge of the critical point and universality class. The leading order finite-size corrections are eliminated by comparing two systems with different sizes; this procedure is also performed automatically. Varying the decay exponent of the long-range interaction, $\sigma$, we investigate $\sigma$-dependence of the dynamical exponent and the other critical exponents precisely in the mean-field, non-universal, and two-dimensional classical Ising universality regimes. We successfully determine the universality boundary between the latter two as $\sigma = 7/4$ based on the dynamical exponent and settle a long-standing dispute on the location of the universality boundary.
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