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![]() MITIOGLU, Anatolie, PŁOCHOCKA, Paulina, GRANADOS DEL AGUILA, Andres, CHRISTIANEN, Peter C.M., DELIGEORGIS, George, ANGHEL, Sergiu, KULYUK, Leonid, MAUDE, Duncan Kennedy. Optical Investigation of Monolayer and Bulk Tungsten Diselenide (WSe2) in High Magnetic Fields. In: Nano letters, 2015, vol. 15, pp. 4387-4392. ISSN 1530-6984. DOI: https://doi.org/10.1021/acs.nanolett.5b00626 |
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Nano letters | |
Volumul 15 / 2015 / ISSN 1530-6984 /ISSNe 1530-6992 | |
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DOI:https://doi.org/10.1021/acs.nanolett.5b00626 | |
Pag. 4387-4392 | |
Rezumat | |
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 1s 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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Cuvinte-cheie bulk, Fermi velocity, massive Dirac Fermions, Monolayer, transition metal dichalcogenides, valley splitting, WSe2 |
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