Discovery of unconventional charge density wave at the surface of K0.9Mo6O17

Abstract

We use Angle Resolved Photoemission Spectroscopy (ARPES), Raman spectroscopy, Low Energy Electron Diffraction (LEED) and x-ray scattering to reveal an unusual electronically mediated charge density wave (CDW) in K0.9Mo6O17. Not only does K0.9Mo6O17 lack signatures of electron-phonon coupling, but it also hosts an extraordinary surface CDW, with TS CDW =220 K nearly twice that of the bulk CDW, TB CDW =115 K. While the bulk CDW has a BCS-like gap of 12 meV, the surface gap is ten times larger and well in the strong coupling regime. Strong coupling behavior combined with the absence of signatures of strong electron-phonon coupling indicates that the CDW is likely mediated by electronic interactions enhanced by low dimensionality.

9 pages, 6 figures

References in corpus (15)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Strongly enhanced charge-density-wave order in monolayer NbSe${}_2$
• Characterization of collective ground states in single-layer NbSe2
• Fermi surface nesting and the origin of Charge Density Waves in metals
• A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• Connection between charge-density-wave order and charge transport in the cuprate superconductors
• Dynamical layer decoupling in a stripe-ordered, high T_c superconductor
• Charge ordering in the electron-doped superconductor Nd2-xCexCuO4
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• Tuning the Charge Density Wave and Superconductivity in CuxTaS2
• Coexistence of charge-density-wave and pair-density-wave orders in underdoped cuprates
• Alternative route to charge density wave formation in multiband systems
• Wave vector dependent electron-phonon coupling drives charge-density-wave formation in TbTe3
• Strong interaction between electrons and collective excitations in multiband superconductor MgB2
• Luttinger liquid ARPES spectra from samples of Li${}_{0.9}$Mo${}_6$O${}_{17}$ grown by the temperature gradient flux technique

Cited by in corpus (12)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Gapless Dirac surface states in the antiferromagnetic topological insulator MnBi2Te4
• Intrinsic axion insulating behavior in antiferromagnetic MnBi${}_6$Te${}_{10}$
• Stable charge density wave phase in a 1T-TiSe${}_2$ monolayer
• Reproduction of the charge density wave phase diagram in $1T$-${\mathrm{TiSe}}_2$ exposes its excitonic character
• Switching of band inversion and topological surface states by charge density wave
• Multiple Charge Density Wave States at the Surface of TbTe${}_3$
• Failed excitonic quantum phase transition in Ta${}_2$Ni(Se${}_{1-x}$S${}_x$)${}_5$
• Charge Density Waves and the Hidden Nesting of Purple Bronze K${}_{0.9}$Mo${}_6$O${}_{17}$
• Electronic Landscape of Group-5 Transition Metal Ditellurides $M$Te${}_2$ ($M$ = V, Nb, Ta): Multiple Crystal Phases with Local Bonds and Flat Bands
• Nesting-driven antiferromagnetic order in Kondo lattice CePd5Al2
• Band-selective Holstein polaron in Luttinger liquid material A0.3MoO3 (A = K, Rb)