Time-dependent real-space renormalization-group approach: application to an adiabatic random quantum Ising model
Time-dependent real-space renormalization-group approach: application to an adiabatic random quantum Ising model
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时间相关的实空间重整化群方法:绝热随机量子伊辛模型的应用
DOI:
10.1088/1751-8121/aaf489
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Mason P
中科院分区:
文献类型:
--
作者:
Mason P
We develop a time-dependent real-space renormalization-group approach which can be applied to Hamiltonians with time-dependent random terms. To illustrate the renormalization-group analysis, we focus on the quantum Ising Hamiltonian with random site-and time-dependent (adiabatic) transverse-field and nearest-neighbour exchange couplings. We demonstrate how the method works in detail, by calculating the off-critical flows and recovering the ground state properties of the Hamiltonian such as magnetization and correlation functions. The adiabatic time allows us to traverse the parameter space, remaining near-to the ground state which is broadened if the rate of change of the Hamiltonian is finite. The quantum critical point, or points, depend on time through the time-dependence of the parameters of the Hamiltonian. We, furthermore, make connections with Kibble–Zurek dynamics and provide a scaling argument for the density of defects as we adiabatically pass through the critical point of the system.
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