標題: Tailoring excitonic states of van der Waals bilayers through stacking configuration, band alignment, and valley spin
作者: Hsu, Wei-Ting
Lin, Bo-Han
Lu, Li-Syuan
Lee, Ming-Hao
Chu, Ming-Wen
Li, Lain-Jong
Yao, Wang
Chang, Wen-Hao
Shih, Chih-Kang
交大名義發表
電子物理學系
National Chiao Tung University
Department of Electrophysics
公開日期: 1-Dec-2019
摘要: Excitons in monolayer semiconductors have a large optical transition dipole for strong coupling with light. Interlayer excitons in heterobilayers feature a large electric dipole that enables strong coupling with an electric field and exciton-exciton interaction at the cost of a small optical dipole. We demonstrate the ability to create a new class of excitons in hetero- and homobilayers that combines advantages of monolayer and interlayer excitons, i.e., featuring both large optical and electric dipoles. These excitons consist of an electron confined in an individual layer, and a hole extended in both layers, where the carrier-species-dependent layer hybridization can be controlled through rotational, translational, band offset, and valley-spin degrees of freedom. We observe different species of layer-hybridized valley excitons, which can be used for realizing strongly interacting polaritonic gases and optical quantum controls of bidirectional interlayer carrier transfer.
URI: http://dx.doi.org/10.1126/sciadv.aax7407
http://hdl.handle.net/11536/153650
ISSN: 2375-2548
DOI: 10.1126/sciadv.aax7407
期刊: SCIENCE ADVANCES
Volume: 5
Issue: 12
起始頁: 0
結束頁: 0
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