Nonlinear optical absorption and LO-phonon emission in steady-state terahertz-driven three-dimensional electron gases

Xu, W.

doi:10.1103/physrevb.57.12939

Cited by 27 publications

(10 citation statements)

References 29 publications

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“…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%

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: Basic Formulationmentioning

confidence: 99%

Magneto-optical transport properties of monolayer MoS2 on polar substrates

et al. 2017

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“…24 It should be noted that in these experiments, the response of spin-split electrons to the radiation fields is detected by transport measurements ͑i.e., the Ohmic contacts are still required and the magnetic fields are present to observe the cyclotron reso-nances͒. From a theoretical point of view, the photoconduc- tivity is mainly induced by electron-photon-impurity ͑-phonon͒ scattering 25 and all possible values of q can make a contribution. Hence, the spectrum observed by photoconduction measurement differs from those obtained from optical experiments.…”

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confidence: 99%

Optical spectrum of a spin-split two-dimensional electron gas

Yuan

Zeng

et al. 2005

Phys. Rev. B

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In this paper, we examine how spin-orbit interaction induced by the Rashba effect affects the optical spectrum of a two-dimensional electron gas ͑2DEG͒. The calculation is carried out on the basis of a standard random-phase approximation for electron-electron interaction. It is found that for a spin-split 2DEG, the spectrum of optical absorption depends strongly on two opticlike plasmon modes caused by inter-spin-orbit excitation. More interestingly, we find that the position and the width of the spectrum relate directly to important spintronic properties. From these theoretical findings, we propose that the Rashba spin splitting can be identified optically and important spintronic coefficients of a 2DEG can be measured via optical experiments.

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“…The term (1 − f c ) implies that the final states at the conduction band are unoccupied. The transition matrix element is [57,58]…”

Section: B Three-particle Scattering Casementioning

confidence: 99%

Magneto-optical absorption in silicene and germanene induced by electric and Zeeman fields

et al. 2020

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We study the optical absorption properties of silicene and germanene in the presence of the perpendicular magnetic and electric fields. Their low-energy Landau level (LL) spectra are controllable by an external electric field, where the spin-and valley-degeneracy of the LLs are strongly influenced by the electric and Zeeman fields. The electric field has removed spin-degeneracy at a given valley. Analytical expressions for the magneto-optical absorption coefficient (MOAC) are expressed in the presence of the interaction between carriers and random impurities and the intrinsic phonons including the spin and valley effects. The results evaluated for the topological insulator and valley-spin-polarized metal phases showed that when the electric field is included, the MOAC peaks are separated for opposite spin cases where the splitting in germanene is stronger than that in silicene. The peak's intensity caused by the carrier-photon-impurity scattering is the highest, the next is the carrier-photon scattering, while the carrier-photon-phonon scattering shows the lowest in both materials. Among the different phonon modes, the out-of-plane (ZA) mode in silicene dominates the others, being attributed to its buckled atomic structure, which does not exist in graphene. When the ZA mode is taken into account, the estimated resultant mobility from the full-width at half-maximum is significantly supported by the experimental result in silicene.

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Nonlinear optical absorption and LO-phonon emission in steady-state terahertz-driven three-dimensional electron gases

Cited by 27 publications

References 29 publications

Magneto-optical transport properties of monolayer MoS2 on polar substrates

Magneto-optical transport properties of monolayer MoS2 on polar substrates

Optical spectrum of a spin-split two-dimensional electron gas

Magneto-optical absorption in silicene and germanene induced by electric and Zeeman fields

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