Charge order from structured coupling in VSe${}_2$

Abstract

Charge order--ubiquitous among correlated materials--is customarily described purely as an instability of the electronic structure. However, the resulting theoretical predictions often do not match high-resolution experimental data. A pertinent case is $1T$-VSe${}_2$, whose single-band Fermi surface and weak-coupling nature make it qualitatively similar to the Peierls model underlying the traditional approach. Despite this, its Fermi surface is poorly nested, the thermal evolution of its charge density wave (CDW) ordering vectors displays an unexpected jump, and the CDW gap itself evades detection in direct probes of the electronic structure. We demonstrate that the thermal variation of the CDW vectors is naturally reproduced by the electronic susceptibility when incorporating a structured, momentum-dependent electron-phonon coupling, while the evasive CDW gap presents itself as a localized suppression of spectral weight centered above the Fermi level. Our results showcase the general utility of incorporating a structured coupling in the description of charge ordered materials, including those that appear unconventional.

References in corpus (23)

• Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x)
• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Extended Phonon Collapse and the Origin of the Charge-Density-Wave in NbSe${}_2$
• A ferroelectric quantum phase transition inside the superconducting dome of Sr${}_{1-x}$Ca${}_x$TiO${}_{3-\delta }$
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Unique gap structure and symmetry of the charge density wave in single-layer VSe${}_2$
• Visualization of Electron Nematicity and Unidirectional Antiferroic Fluctuations at High Temperatures in NaFeAs
• Emergence of coherence in the charge-density wave state of 2H-NbSe${}_2$
• Alternative route to charge density wave formation in multiband systems
• Commensurate Stripes and Phase Coherence in Manganites Revealed with Cryogenic Scanning Transmission Electron Microscopy
• Charge Order from Orbital-dependent Coupling Evidenced by NbSe${}_2$
• Theory of stripes in quasi two dimensional rare-earth tritellurides
• Artificial two-dimensional polar metal at room temperature
• Wave vector dependent electron-phonon coupling drives charge-density-wave formation in TbTe3
• Dimensional cross-over of the charge density wave order parameter in thin exfoliated 1T-VSe${}_2$
• Strain Engineering a $4a\times \sqrt{3}a$ Charge Density Wave Phase in Transition Metal Dichalcogenide 1T-VSe${}_2$
• Orbital symmetry of charge density wave order in La1.875Ba0.125CuO4 and YBa2Cu3O6.67
• Charge Order in NbSe${}_2$
• Electronic transport and specific heat of 1T- VSe2
• Holographic imaging of the complex charge density wave order parameter
• Charge Density Waves and the Hidden Nesting of Purple Bronze K${}_{0.9}$Mo${}_6$O${}_{17}$
• Elemental chalcogens as a minimal model for chiral charge and orbital order

Cited by in corpus (7)

• Coexisting charge-ordered states with distinct driving mechanisms in monolayer VSe${}_2$
• Anharmonicity reveals the tunability of the charge density wave orders in monolayer VSe${}_2$
• Hot carrier-assisted switching of the electron-phonon interaction in 1$T$-VSe${}_2$
• Spectral signatures of a unique charge density wave in Ta${}_2$NiSe${}_7$
• Observation of the charge density wave collective mode in the infrared optical response of VSe${}_2$
• Electronic Landscape of Group-5 Transition Metal Ditellurides $M$Te${}_2$ ($M$ = V, Nb, Ta): Multiple Crystal Phases with Local Bonds and Flat Bands
• Anomalous amplitude mode dynamics below the expected charge-density-wave transition in 1$T$-VSe${}_2$