Crossover from weakly indirect to direct excitons in atomically thin films of InSe
Adrián Ceferino,
Kok Wee Song,
Samuel J. Magorrian
et al.
Abstract:We perform a k • p theory analysis of the spectra of the lowest energy and excited states of the excitons in few-layer atomically thin films of InSe 1-3 taking into account in plane electric polarizability of the film and the influence of the encapsulation environment. For the thinner films, the lowest-energy state of the exciton is weakly indirect in momentum space, with its dispersion showing minima at a layer-number-dependent wave number, due to an inverted edge of a relatively flat topmost valence band bra… Show more
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