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arXiv 0907.3184cond-mat.str-el
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费米子多尺度纠缠重正化

Fermionic multi-scale entanglement renormalization ansatz

Philippe Corboz, Guifre Vidal

摘要:

在最近的贡献[arXiv:0904:4151]纠缠重整化被推广到两个空间维度的费米子晶格系统。纠缠重正化是一种实空间的粗粒化变换,它产生了一种变分的量子力学,称为多尺度纠缠重正化量子力学(MERA),用于局域哈密顿量的基态。在本文中,我们详细描述了费米版本的MERA形式主义和算法。从玻色子MERA,它可以被视为一个量子线路或在一个粗粒化的变换,我们指出该计划需要如何修改,以模拟费米子。为了证实该方法的有效性,我们提出了基准结果的自由和相互作用的费米子的大小之间的$6 \times 6$和$162\times 162$和周期性的边界条件的正方形晶格。目前制定的方法适用于通用张量网络算法。

英文摘要:

In a recent contribution [arXiv:0904:4151] entanglement renormalization was generalized to fermionic lattice systems in two spatial dimensions. Entanglement renormalization is a real-space coarse-graining transformation for lattice systems that produces a variational ansatz, the multi-scale entanglement renormalization ansatz (MERA), for the ground states of local Hamiltonians. In this paper we describe in detail the fermionic version of the MERA formalism and algorithm. Starting from the bosonic MERA, which can be regarded both as a quantum circuit or in relation to a coarse-graining transformation, we indicate how the scheme needs to be modified to simulate fermions. To confirm the validity of the approach, we present benchmark results for free and interacting fermions on a square lattice with sizes between $6 \times 6$ and $162\times 162$ and with periodic boundary conditions. The present formulation of the approach applies to generic tensor network algorithms.

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