Valley-selective optical Stark effect in monolayer WS2
نویسندگان
چکیده
منابع مشابه
Valley-selective optical Stark effect in monolayer WS2.
Breaking space-time symmetries in two-dimensional crystals can markedly influence their macroscopic electronic properties. Monolayer transition metal dichalcogenides (TMDs) are prime examples where the intrinsically broken crystal inversion symmetry permits the generation of valley-selective electron populations, even though the two valleys are energetically degenerate, locked by time-reversal ...
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Coherent optical driving can effectively modify the properties of electronic valleys in transition metal dichalcogenides. Here, we observe a new type of optical Stark effect in monolayer WS2, one that is mediated by intervalley biexcitons under the blue-detuned driving with circularly polarized light. We find that such helical optical driving not only induces an exciton energy downshift at the ...
متن کاملValley - selective optical Stark e ect in monolayerWS 2
Breaking space–time symmetries in two-dimensional crystals can markedly influence their macroscopic electronic properties. Monolayer transition metal dichalcogenides (TMDs) are primeexampleswhere the intrinsicallybrokencrystal inversion symmetry permits the generation of valley-selective electron populations1–4, even though the two valleys are energetically degenerate, locked by time-reversal s...
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Coherent interaction with off-resonance light can be used to shift the energy levels of atoms, molecules, and solids. The dominant effect is the optical Stark shift, but there is an additional contribution from the so-called Bloch-Siegert shift that has eluded direct and exclusive observation in solids. We observed an exceptionally large Bloch-Siegert shift in monolayer tungsten disulfide (WS2)...
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Single layers of transition metal dichalcogenides (TMDs) are direct gap semiconductors with nondegenerate valley indices. An intriguing possibility for these materials is the use of their valley index as an alternate state variable. Several limitations to such a utility include strong intervalley scattering, as well as multiparticle interactions leading to multiple emission channels. We prepare...
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ژورنال
عنوان ژورنال: Nature Materials
سال: 2014
ISSN: 1476-1122,1476-4660
DOI: 10.1038/nmat4156