Recent progress in electron–phonon interaction of two‐dimensional materials

Abstract

The coupling between electrons and phonons is ubiquitous in condensed matter physics. In recent years, with the rise of two dimensional (2D) materials, electron–phonon interaction exhibits unique characteristics compared with their three‐dimensional counterparts. In this paper, research progress of electron–phonon interaction in 2D materials is briefly reviewed, mainly focus on thermoelectric device, conventional superconductor, field effect transistor, and photoelectric device. Firstly, electron–phonon interaction on thermoelectric application of 2D materials is concluded according to recent reports, and strategies to increase figure of merit are discussed. Next, strong electron–phonon coupling strength is essential for increasing transition temperature of superconductors. Conversely, electron–phonon interaction inhibits the carrier mobility for transport process. By summarizing research works in the past years, its role on the performance of 2D materials‐based field effect transistors is fully evaluated. Furthermore, the influences of electron–phonon interaction on light–matter interaction in 2D materials are briefly overviewed. Finally, some outlooks in the field are prospected. In a word, understanding electron–phonon interaction in 2D materials establishes strategically important directions for manipulating physical properties and optimizing device design.

Room-Temperature Magnetic-Induced Circularly Polarized Photoluminescence in Two-Dimensional Er2O2S

“…This electron−phonon coupling is much smaller compared with traditional layered materials such as graphene (300 meV) 56 and MoS 2 (100 meV). 57,58 Such a small value of ω LO further indicates the weak electron−phonon coupling of Er 2 O 2 S, which yields quite small thermal fluctuations in Er 2 O 2 S.…”

Optical Time-Resolved Microscopy on Few-Atoms-Thick Materials

“…60 ■ CONCLUSIONS Transient optical spectra acquired with the pump and probe technique are a consolidated and important experimental tool to study materials' electron and structural dynamics. Pumpinduced modifications in transmission or reflection, i.e., ΔT/T or ΔR/R, are interpreted to show the optical response of 2D films deposited on different substrates, such as the formation of excitons, 9 the electron−phonon coupling 61 or the many-body interactions 10 like bandgap renormalization and trion or biexciton formation. In the interpretation of the pump− probe data, attention should be paid to the presence of the substrate.…”

Determination of acoustic phonon anharmonicities via second-order Raman scattering in CuI

“…This may reveal characteristics, which are otherwise concealed for delocalized properties [1]. Interaction of phonons with other particles are of relevance in low-dimensional materials [2], for electron-phonon coupling in general [2], in phonon reabsorption processes [3] as well as for non-radiative recombination processes [4]. Aside of sound waves, also the transport of heat is mediated via phonons.…”

“…Fit parameters obtained via equation(2) and S1 (the fits are shown in the supplementary). For these parameters, Klemens-like recombination channels were always assumed (ω i ≈ ω0/2).…”