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.

arXiv comment29 pages, 4 figures, 4 Supplementary notes

References in corpus (35)

• 2D materials and van der Waals heterostructures
• Superconductivity in Cu_xTiSe_2
• Strongly enhanced charge-density-wave order in monolayer NbSe${}_2$
• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Characterization of collective ground states in single-layer NbSe2
• Van der Waals metal-semiconductor junction: weak Fermi level pinning enables effective tuning of Schottky barrier
• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• Electronic crystals: an experimental overview
• Controlling many-body states by the electric-field effect in a two-dimensional material
• Signatures of exciton condensation in a transition metal dichalcogenide
• Structure and Control of Charge Density Waves in Two-Dimensional 1T-TaS2
• Non-thermal separation of electronic and structural orders in a persisting charge density wave
• Emergence of a Metal-Insulator Transition and High Temperature Charge Density Waves in VSe2 at the Monolayer Limit
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Unique gap structure and symmetry of the charge density wave in single-layer VSe${}_2$
• Chiral charge-density-waves
• Semimetal to semimetal charge density wave transition in 1T-TiSe${}_2$
• Spontaneous exciton condensation in 1T-TiSe2: a BCS-like approach
• Emergence of charge density waves and a pseudogap in single-layer TiTe2
• Patterns and driving forces of dimensionality-dependent charge density waves in 2H-type transition metal dichalcogenides
• 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
• Orbital- and $k_z$-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe${}_2$
• Doping nature of native defects in 1T-TiSe2
• Chirality and Orbital Order in Charge Density Waves
• Stripe and short range order in the charge density wave of 1T-Cu${}_x$TiSe${}_2$
• Short-range phase coherence and origin of the 1T-TiSe2 charge density wave
• Insight into the charge density wave gap from contrast inversion in topographic STM images
• STM microscopy of the CDW in 1T-TiSe2 in the presence of single atom defects
• Metal-chalcogen bond-length induced electronic phase transition from semiconductor to topological semimetal in ZrX${}_2$ (X = Se and Te)
• Semimetal-to-semiconductor transition and charge-density-wave melting in $1T$-TiSe${}_{2-x}$S${}_x$ single crystals
• Energy-dependent spatial texturing of the charge order in $1T$-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${}_2$