Surface optical phonon-assisted cyclotron resonance in graphene on polar substrates

Phuc, Huynh V.; Đình, Lê

doi:10.1016/j.matchemphys.2015.07.021

Cited by 25 publications

(12 citation statements)

References 74 publications

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“…12(a) we also obtained similar results for the two-photon absorption process, but with smaller values of the resonant peaks. These results are in good agreement with those calculated for graphene on polar substrates [45].…”

Section: Surface Optical Phononssupporting

confidence: 90%

“…The main trend that can be observed here is that with increasing magnetic field the resonant peaks shift to higher energies and their amplitudes increase. This behavior of the MOAC is similar to that in a semiconductor quantum well [79] and in graphene [44,45,62]. This can be qualitatively explained in the one-particle picture as originating from the LL spectrum as follows: With the increase of the magnetic field, the LL spacing increases giving upswing to a higher energy of the absorbed photon.…”

Section: A Intrinsic Acoustic Phononssupporting

confidence: 60%

“…This means that the main transition arises from n = 0 to n = 1 states. The other parameters for intrinsic acoustic and optical phonons are shown in Table I and α 0 = 5 nm [45]. Since the K and K valleys are symmetric (see Fig.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The sums run over all quantum numbers of the states |α ≡ |n,s,η,τ and |α ≡ |n ,s ,η ,τ provided α = α. The transition matrix element per unit area for carrier-photon-phonon interaction of the 2D carrier [45,62], including the -photon absorption process [63,64], is given by Born's second-order golden rule [65] and takes into account the properties of the MoS 2 eigenfunctions…”

Section: Basic Formulationmentioning

confidence: 99%

“…The strong coupling between the carriers of monolayer materials and the remote optical-phonon modes resulting from the polar substrates lead to extended surface-optical (SO) phonon scattering [42]. Therefore, the carrier-SO phonon scattering in graphene [15,44,45] and black phosphorus [46] on polar substrates have been reported with the optimal distances d between materials and substrates of 0.35 nm [44], from 0.2 to 0.8 nm [15], or even up to 1 nm [45,46]. However, carrierphonon scattering, especially carrier-SO phonon scattering, in MoS 2 on polar substrates has not been studied very much so far.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-optical transport properties of monolayer MoS2 on polar substrates

et al. 2017

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We theoretically study the magneto-optical transport properties of monolayer molybdenum disulfide (MoS 2 ) on polar substrates in the presence of a perpendicular magnetic field. The magneto-optical absorption coefficient (MOAC) is investigated as a function of the incident photon energy when carriers are scattered by three different types of phonons: the intrinsic MoS 2 acoustic, optical phonons, and the surface optical (SO) phonons induced by polar substrates. Among the substrates considered, the largest magnitude of MOAC and full-width at half maximum (FWHM) are observed for a SiO 2 substrate over the entire temperature and magnetic field range considered due to its strongest electron-SO phonon scattering, while an h-BN substrate displays the lowest one. The piezoelectric (PE) coupling to the transverse (TA) phonon is shown to dominate the MOAC and FWHM due to intrinsic acoustic phonon scattering. Meanwhile, these properties for intrinsic optical phonons are dominated by zero-order deformation potential (DP) couplings and the Fröhlich interaction. The dependence of the MOAC and FWHM on temperature, magnetic field, and the effective MoS 2 -substrate distance is also examined. The present results for monolayer MoS 2 are compared with those in conventional two-dimensional systems as well as in graphene. Our results show that SO phonons play a crucial role at high temperature depending on the substrates and have a non-negligible effect on the magneto-optical transport properties of monolayer MoS 2 , which could be further experimentally and theoretically investigated in the future.

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Section: Surface Optical Phononssupporting

confidence: 90%