Interlayer exciton-polaron effect in transition metal dichalcogenides van der Waals heterostructures. (November 2019)

• Record Type: Journal Article
• Authors: Dong, Xi-Ying; Li, Run-Ze; Deng, Jia-Pei; Wang, Zi-Wu
• Is Part Of: Journal of physics and chemistry of solids. Volume 134(2019)
• Page Start: 1
• Page End: 4
• Publication Date: 2019-11
• Subjects: Interlayer exciton -- Exciton-phonon coupling -- van der Waals heterostructures; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2019.05.022
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Interlayer exciton-polaron is formed arising from the exciton-surface optical (SO) phonons coupling in transition metal dichalcogenides (TMDS) van der Waals heterostructures, in which SO phonons are induced by the inserted hexagonal boron nitride (h-BN) and the coupling effect is evaluated by means of two unitary transformations. We find that the binding energy of interlayer exciton decreases obviously due to this exciton-polaron effect. The binding energy can be tuned by the numbers of inserted h-BN layers and the interlayer distance between two TMDS layers. Moreover, the critical temperature of quantum Bose gases composing of these interlayer excitons increases in a large scale due to the variations of binding energy. These theoretical results provide possible channels to adjust the properties of interlayer excitons in two-dimensional van der Waals heterostructures.