Electron-phonon interaction and longitudinal-transverse phonon splitting in doped semiconductors

Macheda, Francesco; Barone, Paolo; Mauri, Francesco

doi:10.48550/arxiv.2202.02835

Cited by 2 publications

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“…Macheda et al and Miller et al also shown that the EPC is inversely proportional to the dielectric screening. 55,56 More intuitively, the effective potential felt by conduction band electrons can be written as…”

Section: ■ Resultsmentioning

confidence: 99%

“…55 We also note some works on the calculation of Froḧlich EPC in doped semiconductors by means of effectively estimated dielectric constants. 56 The photoinduced screening of a Froḧlich interaction is of great interest, posing new challenges for tools on many-body interactions. Recent developments in time-dependent GW equations provide further opportunities in this aspect.…”

Section: ■ Resultsmentioning

confidence: 99%

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Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS₂

Liu

Chen

et al. 2022

Nano Lett.

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Nonequilibrium electron−phonon coupling (EPC) serves as a dominant interaction in a multitude of transient processes, including photoinduced phase transitions, coherent phonon generation, and possible light-induced superconductivity.Here we use monolayer MoS 2 as a prototype to investigate the variation in electron−phonon couplings under laser excitation, on the basis of real-time time-dependent density functional theory simulations. Phonon softening, anisotropic modification of the deformation potential, and enhancement of EPC are observed, which are attributed to the reduced electronic screening and modulated potential energy surfaces by photoexcitation. Furthermore, by tracking the transient deformation potential and nonthermal electronic population, we can monitor the ultrafast time evolution of the energy exchange rate between electrons and phonons upon laser excitation. This work provides an effective strategy to investigate the nonequilibrium EPC and constructs a scaffold for understanding nonequilibrium states beyond the multitemperature models.

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Section: ■ Resultsmentioning

confidence: 99%

Section: ■ Resultsmentioning

confidence: 99%

Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS₂

Liu

Chen

et al. 2022

Nano Lett.

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“…A deep understanding of the scattering channels, e.g. electron-phonon scattering and of the related charge car-rier transport properties [23][24][25] is mandatory for the implementation of TMDs in any opto-electronic device. To this end, resonance Raman scattering provides a unique possibility to address the scattering processes in MoSe 2 using several excitation energies, from visible to near UV [26][27][28][29].…”

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Raman Scattering with infrared excitation resonant with MoSe$_2$ indirect band gap

Sotgiu¹,

Venanzi²,

Macheda³

et al. 2022

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Resonance Raman scattering, which probes electrons, phonons and their interplay in crystals, is extensively used in two-dimensional materials. Here we investigate Raman modes in MoSe 2 at different laser excitation energies from 2.33 eV down to the near infrared 1.16 eV. The Raman spectrum at 1.16 eV excitation energy shows that the intensity of high-order modes is strongly enhanced if compared to the first-order phonon modes intensity due to resonance effects with the MoSe 2 indirect band gap. By comparing the experimental results with the two-phonon density of states calculated with density functional theory, we show that the high-order modes originate mostly from two-phonon modes with opposite momenta. In particular, we identify the momenta of the phonon modes that couple strongly with the electrons to produce the resonance process at 1.16 eV, while we verify that at 2.33 eV the two-phonon modes lineshape compares well with the two-phonon density of state calculated over the entire Brillouin Zone. We also show that, by lowering the crystal temperature, we actively suppress the intensity of the resonant two-phonon modes and we interpret this as the result of the increase of the indirect band gap at low temperature that moves our excitation energy out of the resonance condition.

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Electron-phonon interaction and longitudinal-transverse phonon splitting in doped semiconductors

Cited by 2 publications

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Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS₂

Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS₂

Raman Scattering with infrared excitation resonant with MoSe$_2$ indirect band gap

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Electron-phonon interaction and longitudinal-transverse phonon splitting in doped semiconductors

Cited by 2 publications

References 0 publications

Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS2

Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS2

Raman Scattering with infrared excitation resonant with MoSe$_2$ indirect band gap

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Product

Resources

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Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS₂

Calibrating Out-of-Equilibrium Electron–Phonon Couplings in Photoexcited MoS₂