Theory of Exciton-Exciton Interactions in Monolayer Transition Metal Dichalcogenides

被引:69
|
作者
Katsch, Florian [1 ]
Selig, Malte [1 ]
Carmele, Alexander [1 ]
Knorr, Andreas [1 ]
机构
[1] Tech Univ Berlin, Inst Theoret Phys Nichtlineare Opt & Quantenelekt, D-10623 Berlin, Germany
来源
关键词
excitons; transition metal dichalcogenides; two-dimensional materials; valley dynamics; valleytronics; EXCHANGE INTERACTION; BLOCH EQUATIONS; SEMICONDUCTOR; DYNAMICS; DERIVATION; BIEXCITON;
D O I
10.1002/pssb.201800185
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Two-dimensional layers of transition metal dichalcogenides (TMDCs) represent semiconductors with a complex single-particle bandstructure and reduce screening of the three-dimensional Coulomb interaction. The efficient Coulomb interaction causes optical excitations close to the band edge to be dominated by strongly correlated, bound electron-hole pairs, called excitons. Here, a theoretical formalism is presented to efficiently describe the optical dynamics of atomically thin TMDCs in a naturally adapted two particle exciton basis. As an example, Coulomb intravalley coupling, intervalley exchange, as well as intrinsic and Dexter-like intervalley interactions are discussed in Hartree-Fock approximation.
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页数:16
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