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:
Mathematical and Theoretical
影响因子:
--
通讯作者:
Mason P
Mason P
中科院分区:
--
文献类型:
--
作者:
Mason P

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我们提出了一种时变的实空间重整化群方法,它可以应用于具有时变随机项的哈密顿算子。为了说明重整化群分析,我们重点研究了具有随机位置和时间相关(绝热)横场和最近邻交换耦合的量子Ising哈密顿量。我们通过计算非临界流和恢复哈密顿量的基态特性(如磁化和相关函数)来详细演示该方法是如何工作的。绝热时间允许我们遍历参数空间,保持接近基态,如果哈密顿量的变化率是有限的,基态就会展宽。量子临界点,或多个点,通过哈密顿量参数的时间依赖性依赖于时间。此外,我们与Kibble-Zurek动力学建立了联系,并提供了当我们绝热通过系统临界点时缺陷密度的缩放论证。
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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