期刊
NANO LETTERS
卷 15, 期 7, 页码 4387-4392出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00626
关键词
Transition metal dichalcogenides; WSe2; monolayer; bulk; massive Dirac Fermions; Fermi velocity; valley splitting
类别
资金
- Programme Investissements d'Avenir under the program [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]
- ANR JCJC project milliPICS
- Region Midi-Pyrenees under contract MESR [13053031]
- STCU [5809]
- HFML-RU/FOM
- Euro-MagNET II under the EU [228043]
Optical spectroscopy in high magnetic fields B <= 65 T is used to reveal the very different nature of carriers in monolayer and bulk transition metal dichalcogenides. In monolayer WSe2 the exciton emission shifts linearly with the magnetic field and exhibits a splitting that originates from the magnetic field induced valley splitting. The monolayer data can be described using a single particle picture with a Dirac-like Hamiltonian for massive Dirac Fermions, with an additional term to phenomenologically include the valley splitting. In contrast, in bulk WSe2 where the inversion symmetry is restored, transmission measurements show a distinctly excitonic behavior with absorption to the Is and 2s states. Magnetic field induces a spin splitting together with a small diamagnetic shift and cyclotron like behavior at high fields, which is best described within the hydrogen model.
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