Charge Ordering Geometries in Uniaxially-Strained NbSe${}_2$

Abstract

Recent STM experiments reveal niobium diselenide to support domains of striped (1Q) charge order side-by-side with its better-known triangular (3Q) phase, suggesting that small variations in local strain may induce a quantum phase transition between the two. We use a theoretical model of the charge order in NbSe${}_2$, based on a strong momentum- and orbital-dependent electron-phonon coupling, to study the effect of uniaxial strain. We find that as little as $0.1\%$ anisotropic shift in phonon energies breaks the threefold symmetry in favor of a 1Q state, in agreement with the experimental results. The altered symmetries change the transition into the ordered state from weakly-first-order in the 3Q case, to second order in the 1Q regime. Modeling the pseudogap phase of NbSe${}_2$ as the range of temperatures above the onset of long-range order in which phase coherence is destroyed by local phonon fluctuations, we find a shortening of the local ordering wavevector with increasing temperature, complementing recent X-ray diffraction observations within the low-temperature phase.

5 pages, 3 figures

References in corpus (8)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Broken translational and rotational symmetry via charge stripe order in underdoped YBCO
• Emergence of coherence in the charge-density wave state of 2H-NbSe${}_2$
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• Charge Order from Orbital-dependent Coupling Evidenced by NbSe${}_2$
• d-Wave Checkerboard Order in Cuprates

Cited by in corpus (9)

• Atomic-Scale Strain Manipulation of a Charge Density Wave
• Competing Coulomb and electron-phonon interactions in NbS${}_2$
• Charge Order in NbSe${}_2$
• Evidence for realignment of the charge density wave state in ErTe${}_3$ and TmTe${}_3$ under uniaxial stress via elastocaloric and elastoresistivity measurements
• Strain-induced stripe phase in charge ordered single layer NbSe${}_2$
• Thermodynamic Anomaly Above the Superconducting Critical Temperature in the Quasi One-Dimensional Superconductor Ta${}_4$Pd${}_3$Te${}_{16}$
• Quantum phase transition in few-layer NbSe${}_2$ probed through quantized conductance fluctuations
• Charge Density Waves and the Effects of Uniaxial Strain on the Electronic Structure of 2H-NbSe${}_2$
• Stacking of charge-density waves in 2H-NbSe${}_2$ bilayers