Kibble-Zurek mechanism in a Dissipative Transverse Ising Chain
| Autor: | Naokazu Shibata, Hiroki Oshiyama, Sei Suzuki |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Kibble-Zurek mechanism Ising chain Statistical Mechanics (cond-mat.stat-mech) Numerical analysis Time-evolving block decimation General Physics and Astronomy FOS: Physical sciences Transverse plane Classical mechanics Condensed Matter::Statistical Mechanics Dissipative system Mechanism (sociology) Condensed Matter - Statistical Mechanics Boson |
| Popis: | We study the Kibble-Zurek mechanism in the transverse Ising chain coupled to a dissipative boson bath, making use of a new numerical method with the infinite time evolving block decimation combined with the discrete-time path integral. We first show the ground-state phase diagram and confirm that a quantum phase transition takes place in the presence of the system-bath coupling. Then we present the time dependence of the energy expectation value of the spin Hamiltonian and the scaling of the kink density with respect to the time period over which the spin Hamiltonian crosses a quantum phase transition. The energy of spins starts to grow from the energy at the ground state of the full system near a quantum phase transition. The kink density decays as a power law with respect to the time period. These results confirm that the Kibble-Zurek mechanism happens. We discuss the exponent for the decay of the kink density in comparison with a theoretical result with the quantum Monte-Carlo simulation. A comparison to an experimental study is also briefly mentioned. 8 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|