On the Su–Schrieffer–Heeger model of electron transport: Low‐temperature optical conductivity by the Mellin transform
On the Su–Schrieffer–Heeger model of electron transport: Low‐temperature optical conductivity by the Mellin transform
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关于电子传输的 Su-Schrieffer-Heeger 模型:梅林变换的低温光导率
DOI:
10.1111/sapm.12604
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发表时间:
2023
影响因子:
2.7
通讯作者:
Luskin, Mitchell
中科院分区:
文献类型:
--
作者:
Margetis, Dionisios;Watson, Alexander B.;Luskin, Mitchell
We describe the low‐temperature optical conductivity as a function of frequency for a quantum‐mechanical system of electrons that hop along a polymer chain. To this end, we invoke the Su–Schrieffer–Heegertight‐bindingHamiltonian for noninteracting spinless electrons on a one‐dimensional (1D) lattice. Our goal is to show via asymptotics how the interband conductivity of this system behaves as the smallest energy bandgap tends to close. Our analytical approach includes: (i) the Kubo‐type formulation for the optical conductivity with a nonzero damping due to microscopic collisions, (ii) reduction of this formulation to a 1D momentum integral over the Brillouin zone, and (iii) evaluation of this integral in terms of elementary functions via the three‐dimensional Mellin transform with respect to key physical parameters and subsequent inversion in a region of the respective complex space. Our approach reveals an intimate connection of the behavior of the conductivity to particular singularities of its Mellin transform. The analytical results are found in good agreement with direct numerical computations.
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DOI:
10.2200/s00076ed1v01y200612cem013
发表时间:
2007
影响因子:
1.9
作者:
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通讯作者:
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影响因子:
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DOI:
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发表时间:
2020
期刊:
SIAM J. Math. Anal.
影响因子:
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作者:
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通讯作者:
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影响因子:
1.9
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影响因子:
1.6
作者:
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