Semiconductor-metal phase transition and emergent charge density waves in 1T-ZrX${}_2$ (X = Se, Te) at the two-dimensional limit

Abstract

Charge density wave (CDW) is a collective quantum phenomenon in metals and features a wave-like modulation of the conduction electron density. A microscopic understanding and experimental control of this many-body electronic state in atomically thin materials remain hot topics in materials physics. By means of material engineering, we realized a dimensionality and Zr intercalation induced semiconductor-metal phase transition in 1T-ZrX${}_2$ (X = Se, Te) ultra-thin films, accompanied by a commensurate 2 $\times$ 2 CDW order. Furthermore, we observed a CDW energy gap up to 22 meV around the Fermi level. Fourier-transformed scanning tunneling microscopy and angle-resolved photoemission spectroscopy reveal that 1T-ZrX${}_2$ films exhibit the simplest Fermi surface among the known CDW materials in TMDCs, consisting only of Zr 4d-derived elliptical electron conduction band at the corners of the Brillouin zone.

29 pages, 4 figures, 4 Supplementary notes

References in corpus (14)

• 2D materials and van der Waals heterostructures
• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• Controlling many-body states by the electric-field effect in a two-dimensional material
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Semimetal to semimetal charge density wave transition in 1T-TiSe${}_2$
• Spontaneous exciton condensation in 1T-TiSe2: a BCS-like approach
• Influence of domain walls in the incommensurate charge density wave state of Cu intercalated 1$T$-TiSe${}_2$
• Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in CuxTiSe2
• Molecular beam epitaxy growth and scanning tunneling microscopy study of TiSe${}_2$ ultrathin films
• Giant Kohn anomaly and the phase transition in charge density wave ZrTe_3
• Quantum enhancement of charge density wave in NbS${}_2$ in the 2D limit
• Doping nature of native defects in 1T-TiSe2
• Stripe and short range order in the charge density wave of 1T-Cu${}_x$TiSe${}_2$

Cited by in corpus (6)

• Evidences for the exciton gas phase and its condensation in monolayer 1T-ZrTe2
• Evidence of high-temperature exciton condensation in a two-dimensional semimetal
• Evidence for multiband superconductivity and charge density waves in Ni-doped ZrTe${}_2$
• Superconductivity in Te-deficient ZrTe${}_2$
• Chiral charge density wave and backscattering-immune orbital texture in monolayer 1T-TiTe2
• Doping Tunable CDW Phase Transition in Bulk 1T-ZrSe${}_2$