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Exciton diamagnetic shifts and valley Zeeman effects in monolayer WS2 and MoS2 to 65 Tesla

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Stier, Andreas V., McCreary, Kathleen M., Jonker, Berend T., Kono, Junichiro, Crooker, Scott A.·2016·Nature Communications

Abstract

In bulk and quantum-confined semiconductors, magneto-optical studies have historically played an essential role in determining the fundamental parameters of excitons (size, binding energy, spin, dimensionality and so on). Here we report low-temperature polarized reflection spectroscopy of atomically thin WS 2 and MoS 2 in high magnetic fields to 65 T. Both the A and B excitons exhibit similar Zeeman splittings of approximately −230 μeV T−1(g-factor ≃−4), thereby quantifying the valley Zeeman effect in monolayer transition-metal disulphides. Crucially, these large fields also allow observation of the small quadratic diamagnetic shifts of both A and B excitons in monolayer WS 2, from which radii of ∼1.53 and ∼1.16 nm are calculated. Further, when analysed within a model of non-local dielectric screening, these diamagnetic shifts also constrain estimates of the A and B exciton binding energies (410 and 470 meV, respectively, using a reduced A exciton mass of 0.16 times the free electron mass). These results highlight the utility of high magnetic fields for understanding new two-dimensional materials.

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Metadata

Authors
Stier, A. V., McCreary, K. M., Jonker, B. T., Kono, J., & Crooker, S. A.
Venue
Nature Communications
Published
2016-02-09
Volume
7
Issue
1
Pages
10643-10643
ISSN
2041-1723 (ISSN-L)
OpenAlex
W1850053210
Cited by
352
References
45
FWCI
18.34
Type
journal article
Language
en
Open access
gold

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