期刊
NATURE PHYSICS
卷 14, 期 4, 页码 355-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41567-017-0033-4
关键词
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资金
- Danish Council for Independent Research, Natural Sciences, under the Sapere Aude programme [DFF-4090-00125]
- VILLUM FONDEN [15375]
- postdoctoral programme of the German Academic Exchange Service (DAAD)
- Swiss National Science Foundation [P2ELP2-155357]
- NSF-MRSEC [DMR-1420451]
- NRL Nanoscience Institute
- Air Force Office of Scientific Research [AOARD 14IOA018-134141]
- US Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
- Villum Fonden [00015375] Funding Source: researchfish
In two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs), new electronic phenomena such as tunable bandgaps(1-3) and strongly bound excitons and trions emerge from strong many-body effects(4-6), beyond the spin and valley degrees of freedom induced by spin-orbit coupling and by lattice symmetry(7). Combining single-layer TMDs with other 2D materials in van der Waals heterostructures offers an intriguing means of controlling the electronic properties through these many-body effects, by means of engineered interlayer interactions(8-10). Here, we use micro-focused angle-resolved photoemission spectroscopy (microARPES) and in situ surface doping to manipulate the electronic structure of single-layer WS2 on hexagonal boron nitride (WS2/h-BN). Upon electron doping, we observe an unexpected giant renormalization of the spin-orbit splitting of the single-layer WS2 valence band, from 430 meV to 660 meV, together with a bandgap reduction of at least 325 meV, attributed to the formation of trionic quasiparticles. These findings suggest that the electronic, spintronic and excitonic properties are widely tunable in 2D TMD/h-BN heterostructures, as these are intimately linked to the quasiparticle dynamics of the materials(11-13).
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