Inelastic electron tunneling in 2H-Ta${}_x$Nb${}_{1-x}$Se${}_2$ evidenced by scanning tunneling spectroscopy

Abstract

We report a detailed study of tunneling spectra measured on 2H-Ta${}_x$Nb${}_{1-x}$Se${}_2$ ($x=0\sim 0.1$) single crystals using a low-temperature scanning tunneling microscope. The prominent gap-like feature unintelligible for a long time was found to be accompanied by some "in-gap" fine structures. By investigating the second-derivative spectra and their temperature and magnetic field dependencies, we were able to prove that inelastic electron tunneling is the origin of these features and obtain the Eliashberg function of 2H-Ta${}_x$Nb${}_{1-x}$Se${}_2$ at atomic scale, providing a potential way to study the local Eliashberg function and phonon spectra of the related transition-metal dichalcogenides.

arXiv comment6 pages, 5 figures. To appear in Physical Review Letters

References in corpus (18)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Phonons and related properties of extended systems from density-functional perturbation theory
• Van der Waals density functional: Self-consistent potential and the nature of the van der Waals bond
• Molecular Transport Junctions: Vibrational Effects
• Characterization of collective ground states in single-layer NbSe2
• Giant Phonon-induced Conductance in Scanning Tunneling Spectroscopy of Gate-tunable Graphene
• Spin signature of nonlocal-correlation binding in metal organic frameworks
• Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe${}_2$
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Specular Interband Andreev Reflections in Graphene
• Emergence of coherence in the charge-density wave state of 2H-NbSe${}_2$
• Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe2
• Charge Order from Orbital-dependent Coupling Evidenced by NbSe${}_2$
• Phonon and plasmon excitation in inelastic electron tunneling spectroscopy of graphite
• Local measurement of the Eliashberg function of Pb islands: enhancement of electron-phonon coupling by quantum well states
• Coupling to real and virtual phonons in tunneling spectroscopy of superconductors

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