Many-body effect of mesoscopic localized states in MoS2 monolayer

Abstract

Transition metal dichalcogenide monolayers provide an emerging material system to implement quantum photonics with intrinsic two-dimensional excitons or embedded zero-dimensional localized states. Here we demonstrate the mesoscopic localized states between two-and zero-dimensions, which is a many-body system with electron-electron Coulomb interactions. A fine structure splitting is observed, which is similar to quantum dots. Meanwhile the polarization is changed by the magnetic field, due to the nature of two-dimensional monolayers. Furthermore, a large quadratic diamagnetism with a coefficient of around 100 µeV/T 2 is observed, as a unique consequence of the mesoscopic scale. The many-body effect also results in the emission energy variation and linewidth narrowing in the spectrum, which corresponds well to the theoretical analysis. These unique properties indicate the great potential of mesoscopic localized states in many-body physics and quantum photonics. * Contributed equally to this work. † xlxu@iphy.ac.cn

Strong Triplet-Exciton–LO-Phonon Coupling in Two-Dimensional Layered Organic–Inorganic Hybrid Perovskite Single Crystal Microflakes

“…The coefficients close to 1 are typical characteristics of single excitons, indicating that P1 and P2 derive from the single exciton states. 33 This further excludes the possibility that P2 comes from biexcitons whose dependence coefficient of PL intensity on excitation power should be around 2. 18,24,34,35 Figure 3c displays the normalized PL spectra as a function of temperature of the sample 1.…”

“…These two peaks exhibit a similar trend with increasing excitation power, and the coefficients of 0.98 and 0.94 for P1 and P2 are extracted respectively via fitting with a power-law function. The coefficients close to 1 are typical characteristics of single excitons, indicating that P1 and P2 derive from the single exciton states . This further excludes the possibility that P2 comes from biexcitons whose dependence coefficient of PL intensity on excitation power should be around 2. ,,, …”

Hot Polarons with Trapped Excitons and Octahedra‐Twist Phonons in CH3NH3PbBr3 Hybrid Perovskite Nanowires

“…This difference gives a physical explanation of high tolerance of defects in HOIPs from the point of phonons. Additionally, the LXs with narrow linewidth is also a potential quantum emitter [58][59][60][61], thus, more applications can be expected in quantum information processing based on perovskites in the future.…”

Probing Excitonic Rydberg States by Plasmon Enhanced Nonlinear Optical Spectroscopy in Monolayer WS2 at Room Temperature

“…Monolayer TMDCs have been known to exhibit significantly enhanced Coulomb interactions between the electron and hole pairs in the 2D limit owing to reduced dielectric screening and quantum confinement effect . Consequently, the bound excitonic states below the quasiparticle bandgap generally exhibit electronic energy levels analogous to the hydrogen series. − The corresponding Rydberg excitonic states are generally labeled as 1s, 2s, 2p, and so on. − Based on the symmetry selection rules of electronic transition, one-photon excitation process can only reach states with even parity such as “s” state. “ns” (n = 1, 2, 3 ···) states are dipole allowed (bright states) and can be directly probed by linear optical spectroscopy such as optical reflectance spectroscopy, , and photoluminescence (PL) excitation (PLE) spectroscopy .…”