Enhancement of impact ionization in Hubbard clusters by disorder and next-nearest-neighbor hopping

被引：11

作者：

Kauch, Anna ^{[1
]}

Worm, Paul ^{[1
]}

Prauhart, Paul ^{[1
]}

Innerberger, Michael ^{[1
,2
]}

Watzenboeck, Clemens ^{[1
]}

Held, Karsten ^{[1
]}

机构：

[1] Vienna Univ Technol, Inst Solid State Phys, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria

[2] Vienna Univ Technol, Inst Anal & Sci Comp, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 24期

基金：

奥地利科学基金会;

关键词：

EFFICIENCY;

D O I：

10.1103/PhysRevB.102.245125

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We perform time-resolved exact diagonalization of the Hubbard model with time-dependent hoppings on small clusters of up to 12 sites. Here, the time dependence originates from a classic electromagnetic pulse, which mimics the impact of a photon. We investigate the behavior of the double occupation and spectral function after the pulse for different cluster geometries and onsite potentials. We find impact ionization in all studied geometries except for one-dimensional chains. Adding next-nearest-neighbor hopping to the model leads to a significant enhancement of impact ionization, as does disorder and geometric frustration of a triangular lattice.

引用

页数：13

共 33 条

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