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

Andreas V. Stier, Kathleen M. McCreary, Berend T. Jonker, Junichiro Kono and Scott A. Crooker ()
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Andreas V. Stier: National High Magnetic Field Laboratory, Los Alamos National Laboratory
Kathleen M. McCreary: Naval Research Laboratory
Berend T. Jonker: Naval Research Laboratory
Junichiro Kono: Rice University
Scott A. Crooker: National High Magnetic Field Laboratory, Los Alamos National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: 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 WS2 and MoS2 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 WS2, 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.

Date: 2016
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DOI: 10.1038/ncomms10643

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