Possible strain induced Mott gap collapse in 1T-TaS${}_2$

Abstract

Tuning the electronic properties of a matter is of fundamental interest in scientific research as well as in applications. Recently, the Mott insulator-metal transition has been reported in a pristine layered transition metal dichalcogenides 1T-TaS${}_2$, with the transition triggered by an optical excitation, a gate controlled intercalation, or a voltage pulse. However, the sudden insulator-metal transition hinders an exploration of how the transition evolves. Here, we report the strain as a possible new tuning parameter to induce Mott gap collapse in 1T-TaS${}_2$. In a strain-rich area, we find a mosaic state with distinct electronic density of states within different domains. In a corrugated surface, we further observe and analyze a smooth evolution from a Mott gap state to a metallic state. Our results shed new lights on the understanding of the insulator-metal transition and promote a controllable strain engineering on the design of switching devices in the future.

arXiv comment16 pages, 4 figures

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Cited by in corpus (20)

• Imaging spinon density modulations in a 2D quantum spin liquid
• Effect of Stacking Order on the Electronic State of 1T-TaS${}_2$
• Out-of-plane transport of 1T-TaS2/graphene-based van der Waals heterostructures
• Zoology of domain walls in quasi-2D correlated charge density wave of 1T-TaS2
• Local gate control of Mott metal-insulator transition in a 2D metal-organic framework
• Spin-orbit and exchange proximity couplings in graphene/1T-TaS${}_2$ heterostructure triggered by a charge density wave
• Reconcile the Bulk Metallic and Surface Insulating state in 1T-TaSe${}_2$
• Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2
• Modified interlayer stacking and insulator to correlated-metal transition driven by uniaxial strain in 1$T$-TaS${}_2$
• The two-dimensional $t$-$t^{\prime }$ Holstein model
• Doublon-like excitations and their phononic coupling in a Mott charge-density-wave system
• Insulator-to-metal Mott transition facilitated by lattice deformation in monolayer $\alpha$-RuCl${}_3$ on graphite
• Lattice-Driven Chiral Charge Density Wave State in 1T-TaS${}_2$
• Observation and manipulation of a phase separated state in a charge density wave material
• Charge-Density Wave Driven Giant Thermionic-Current Switching in 1T-TaS${}_2$/2H-TaSe${}_2$/2H-MoS${}_2$ Heterostructure
• Hidden electronic phase in strained few-layer 1T-TaS2
• Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides
• Strain Engineering of Correlated Charge-Ordered Phases in 1T-TaS2
• Scanning tunneling microscopy study of hidden phases in atomically thin 1T-TaS${}_2$
• Emergent quantum phenomena in two-dimensional 1T-TaS2