Holstein polaron in a valley-degenerate two-dimensional semiconductor

Abstract

Two-dimensional (2D) crystals have emerged as a class of materials with tuneable carrier density. Carrier doping to 2D semiconductors can be used to modulate manybody interactions and to explore novel composite particles. Holstein polaron is a small composite particle of an electron carrying a cloud of self-induced lattice deformation (or phonons), which has been proposed to play a key role in high-temperature superconductivity and carrier mobility in devices. Here, we report the discovery of Holstein polarons in a surface-doped layered semiconductor, MoS2, where a puzzling 2D superconducting dome with the critical temperature of 12 K was found recently. Using a high-resolution band mapping of charge carriers, we found strong band renormalizations collectively identified as a hitherto unobserved spectral function of Holstein polarons. The unexpected short-range nature of electron-phonon (e-ph) coupling in MoS2 can be explained by its valley degeneracy that enables strong intervalley coupling mediated by acoustic phonons. The coupling strength is found to gradually increase along the superconducting dome up to the intermediate regime, suggesting bipolaronic pairing in 2D superconductivity.

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Cited by in corpus (39)

• Ab initio theory of polarons: formalism and applications
• Light Bipolarons Stabilized by Peierls Electron-Phonon Coupling
• Ultrafast dynamics of electrons and phonons: from the two-temperature model to the time-dependent Boltzmann equation
• Nonequilibrium Lattice Dynamics in Monolayer MoS2
• Observation of the polaronic character of excitons in a two-dimensional semiconducting magnet $\mathrm{Cr}{\mathrm{I}}_3$
• Polarons in two-dimensional atomic crystals
• Enhanced electron-phonon interaction in multi-valley materials
• Bright excitons with negative-mass electrons
• Unified approach to polarons and phonon-induced band structure renormalization
• Ab initio self-consistent many-body theory of polarons at all couplings
• Atomic-scale Manipulation of Single-Polaron in a Two-Dimensional Semiconductor
• Two-dimensional plasmonic polarons in n-doped monolayer MoS2
• Manipulating single excess electrons in monolayer transition metal dihalide
• Chiral valley phonons and flat phonon bands in moiré materials
• Narrow photoluminescence peak of epitaxial MoS${}_2$ on graphene/Ir(111)
• Direct probing of phonon mode specific electron-phonon scatterings in two-dimensional semiconductor transition metal dichalcogenides: Symmetry and Berry phase
• Metal-Insulator Transition and Emergent Gapped Phase in the Surface-Doped 2D Semiconductor 2H-MoTe${}_2$
• Spectral functions of CVD grown MoS${}_2$ monolayers after chemical transfer onto Au surface
• Emergence of large non-adiabatic effects induced by the electron-phonon interaction on the complex vibrational quasi-particle spectrum of the doped monolayer MoS${}_2$
• Two-Dimensional Moiré Polaronic Electron Crystals
• Long living carriers in a strong electron-phonon interacting two-dimensional doped semiconductor
• Intervalley Polaron in Atomically Thin Transition Metal Dichalcogenides
• Mapping multi-valley Lifshitz transitions induced by field-effect doping in strained MoS2 nanolayers
• Identification of large polarons and exciton polarons in rutile and anatase polymorphs of titanium dioxide
• Polaronic and Mott insulating phase of layered magnetic vanadium trihalide VCl3
• Variational Polaron Equations Applied to the Anisotropic Fröhlich Model
• Spectroscopic signatures of nonpolarons : the case of diamond
• Holstein polarons, Rashba-like spin splitting and Ising superconductivity in electron-doped MoSe2
• Strong band-filling-dependence of the scattering lifetime in gated MoS2 nanolayers induced by the opening of intervalley scattering channels
• Direct observation of two-dimensional small polarons at correlated oxide interface
• Polarons in the Cubic Generalized Fröhlich Model: Spontaneous Symmetry Breaking
• Spectral function of a bipolaron coupled to dispersive optical phonons
• Dichotomy of electron-phonon interactions in the delafossite PdCoO${}_2$: From weak bulk to polaronic surface coupling
• Coupling between small polarons and ferroelectricity in BaTiO3
• Plasmonic polaron in self-intercalated 1T-TiS2
• Going Beyond the Cumulant Approximation: Power Series Correction to Single Particle Green's Function in Holstein System
• Interfacial Polarons Driven by Charge Transfer In WSe2/Cuprate Superconductor Systems
• Band-selective Holstein polaron in Luttinger liquid material A0.3MoO3 (A = K, Rb)
• Spectral Functions of the Holstein Polaron: Exact and Approximate Solutions