Dynamical screening effects of substrate phonons on two-dimensional excitons

被引：15

作者：

Steinhoff, Alexander ^{[1
]}

Florian, Matthias ^{[1
]}

Jahnke, Frank ^{[1
,2
]}

机构：

[1] Univ Bremen, Inst Theoret Phys, POB 330 440, D-28334 Bremen, Germany

[2] Univ Bremen, MAPEX Ctr Mat & Proc, D-28359 Bremen, Germany

来源：

PHYSICAL REVIEW B | 2020年 / 101卷 / 04期

关键词：

LIGHT-EMITTING-DIODES; MONOLAYER; SEMICONDUCTOR; LASERS;

D O I：

10.1103/PhysRevB.101.045411

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Atomically thin materials are exceedingly susceptible to their dielectric environment. For transition metal dichalcogenides, sample placement on a substrate or encapsulation in hexagonal boron nitride (hBN) are frequently used. In this paper we show that the dielectric response due to optical phonons of adjacent materials influences excitons in two-dimensional (2D) crystals. We provide an analytic model for the coupling of 2D charge carriers to optical substrate phonons, which causes polaron effects similar to that of intrinsic 2D phonons. We apply the model to hBN-encapsulated WSe2, finding a significant reduction of the exciton binding energies due to dynamical screening effects.

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页数：7

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