Holstein polarons, rashba-like spin splitting, and ising superconductivity in electron-doped MoSe2

DOI: 10.1021/acsnano.4c07805

Authors: Sung Won Jung (Diamond Light Source; Gyeongsang National University) , Matthew D. Watson (Diamond Light Source) , Saumya Mukherjee (Diamond Light Source; University of Amsterdam) , Daniil V. Evtushinsky (École Polytechnique Fédérale de Lausanne) , Cephise Cacho (Diamond Light Source) , Edoardo Martino (École Polytechnique Fédérale de Lausanne) , Helmuth Berger (École Polytechnique Fédérale de Lausanne) , Timur K. Kim (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Nano , VOL 18 , PAGES 33359

State: Published (Approved)
Published: November 2024
Diamond Proposal Number(s): 26631

Abstract: Interaction between electrons and phonons in solids is a key effect defining the physical properties of materials, such as electrical and thermal conductivity. In transition metal dichalcogenides (TMDCs), the electron–phonon coupling results in the formation of polarons, quasiparticles that manifest themselves as discrete features in the electronic spectral function. In this study, we report the formation of polarons at the alkali-dosed MoSe2 surface, where Rashba-like spin splitting of the conduction band states is caused by an inversion-symmetry breaking electric field. In addition, we observed a crossover from phonon-like to plasmon-like polaronic spectral features at the MoSe2 surface with increasing doping. Our findings support the concept of electron–phonon coupling-mediated superconductivity in electron-doped layered TMDC materials, as observed using ionic liquid gating technology. Furthermore, the discovered spin-splitting at the Fermi level could offer crucial experimental validation for theoretical models of Ising-type superconductivity in these materials.

Journal Keywords: Transition Metal Dichalcogenides; Surface Doping; Electronic Structure; Polarons; Ising Superconductivity; ARPES

Subject Areas: Mathematics, Physics


Instruments: I05-ARPES

Added On: 29/11/2024 08:27

Documents:
jung-et-al-2024-holstein-polarons-rashba-like-spin-splitting-and-ising-superconductivity-in-electron-doped-mose2.pdf

Discipline Tags:

Surfaces Superconductors Quantum Materials Physics Hard condensed matter - structures Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)