Efficient computation of Kubo conductivity for incommensurate 2D heterostructures

Efficient computation of Kubo conductivity for incommensurate 2D heterostructures
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有效计算不相称二维异质结构的 Kubo 电导率

DOI:
10.1140/epjb/e2020-100518-7
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发表时间:
2020
期刊:
The European Physical Journal B
影响因子:
--
通讯作者:
Luskin, Mitchell
Luskin, Mitchell
中科院分区:
--
文献类型:
--
作者:
Massatt, Daniel;Carr, Stephen;Luskin, Mitchell

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本文介绍了一种利用紧束缚框架,通过Kubo公式计算二维无公度双层异质结构电导率的数值方法。我们开始从真实的空间紧束缚模型使用适当的Bloch变换算子推导动量空间公式和Kubo公式。我们进一步讨论所得到的算法沿着其收敛速度和计算成本的模型参数,如弛豫时间和温度。特别是,我们表明,对于低频率,低温度和长弛豫时间的电导率可以非常有效地计算使用动量空间算法的广泛的一类材料。然后,我们通过计算小扭曲角下扭曲双层石墨烯(tBLG)的电导率来展示我们的方法。图形摘要
AbstractWe introduce a numerical method for computing conductivity via the Kubo formula for incommensurate 2D bilayer heterostructures using a tight-binding framework. We begin by deriving the momentum space formulation and Kubo formula from the real space tight-binding model using the appropriate Bloch transformation operator. We further discuss the resulting algorithm along with its convergence rate and computational cost in terms of model parameters such as relaxation time and temperature. In particular, we show that for low frequencies, low temperature, and long relaxation times conductivity can be computed very efficiently using the momentum space algorithm for a wide class of materials. We then showcase our method by computing conductivity for twisted bilayer graphene (tBLG) for small twist angles.Graphical abstract
DOI: 10.1038/s41563-019-0346-z
发表时间: 2019-05-01
期刊: NATURE MATERIALS
影响因子: 41.2
作者:
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