Bulk iridium ditelluride(IrTe2)is a layered material and is known for its interesting electronic and structural properties,such as large spin-orbit coupling,charge ordering,and superconductivity.However,so far there i...Bulk iridium ditelluride(IrTe2)is a layered material and is known for its interesting electronic and structural properties,such as large spin-orbit coupling,charge ordering,and superconductivity.However,so far there is no experimental study about the fabrication of monolayer IrTe2.Here we report the formation of IrTe2 monolayer on Ir(111)substrate by direct tellurization method.Scanning tunneling microscope(STM)images show the coexistence of 1/5 phase and 1/6 phase structures of IrTe2 at room temperature.We also obtained STM images showing distorted stripe feature under low temperatures.This stripe feature is possibly induced by the strain between the IrTe2 monolayer and the metal substrate.Density functional theory(DFT)calculations show that the IrTe2 monolayer has strong interaction with the underlying Ir(111)substrate.展开更多
The IrTe2 transition metal dichalcogenide un- dergoes a series of structural and electronic phase transi- tions when doped with Pt. The nature of each phase and the mechanism of the phase transitions have attracted mu...The IrTe2 transition metal dichalcogenide un- dergoes a series of structural and electronic phase transi- tions when doped with Pt. The nature of each phase and the mechanism of the phase transitions have attracted much attention. In this paper, we report scanning tunneling mi- croscopy and spectroscopy studies of Pt-doped IrTe2 with varied Pt contents. In pure IrTe2, we find that the ground state has a 1/6 superstructure, and the electronic structure is inconsistent with Fermi surface nesting-induced charge density wave order. Upon Pt doping, the crystal structure changes to a 1/5 superstructure and then to a quasi-periodic hexagonal phase. First-principles calculations show that the superstructures and electronic structures are determined by the global chemical strain and local impurity states that can be tuned systematically by Pt doping.展开更多
基金Project supported by the National Key Research&Development Project of China(Grant Nos.2019YFA0308500,2018YFA0305800,and 2016YFA0202300)the National Natural Science Foundation of China(Grant Nos.51991340,61888102,and 11888101)the Chinese Academy of Sciences(Grant Nos.XDB28000000 and XDB30000000).
文摘Bulk iridium ditelluride(IrTe2)is a layered material and is known for its interesting electronic and structural properties,such as large spin-orbit coupling,charge ordering,and superconductivity.However,so far there is no experimental study about the fabrication of monolayer IrTe2.Here we report the formation of IrTe2 monolayer on Ir(111)substrate by direct tellurization method.Scanning tunneling microscope(STM)images show the coexistence of 1/5 phase and 1/6 phase structures of IrTe2 at room temperature.We also obtained STM images showing distorted stripe feature under low temperatures.This stripe feature is possibly induced by the strain between the IrTe2 monolayer and the metal substrate.Density functional theory(DFT)calculations show that the IrTe2 monolayer has strong interaction with the underlying Ir(111)substrate.
基金supported by the National Natural Science Foundation and Ministry of Science and Technology of China(2011CB921901,2011CB921701,2012CB821403,and 2015CB921000)
文摘The IrTe2 transition metal dichalcogenide un- dergoes a series of structural and electronic phase transi- tions when doped with Pt. The nature of each phase and the mechanism of the phase transitions have attracted much attention. In this paper, we report scanning tunneling mi- croscopy and spectroscopy studies of Pt-doped IrTe2 with varied Pt contents. In pure IrTe2, we find that the ground state has a 1/6 superstructure, and the electronic structure is inconsistent with Fermi surface nesting-induced charge density wave order. Upon Pt doping, the crystal structure changes to a 1/5 superstructure and then to a quasi-periodic hexagonal phase. First-principles calculations show that the superstructures and electronic structures are determined by the global chemical strain and local impurity states that can be tuned systematically by Pt doping.
