Through thephotoexcitation, remarkable changes on both the CDW intensity and orientationare clearly observed associated with the transformation from a commensurate (C)into an incommensurate (IC) phase in a time-scale of about 3 ps. Moreover, thetransient states show up a notable "structurally ...
The C-CDW transition temperatures as a function of film thickness are determined from the evolution of these new Raman peaks and they are found to decrease from 473K to 413K as the film thicknesses decrease from 150 nm to 35 nm. A comparison of the Raman data with ab initio calculations...
Four-dimensional ultrafast transmission electron microscopy (4D-UTEM)measurements reveal a rich variety of structural dynamic phenomena at a phasetransition in the charge-density-wave (CDW) 1T-TaSe2. Through thephotoexcitation, remarkable changes on both the CDW intensity and orientationare clearly observ...
Theory of STM image of CDW in 1T-TaSe 2 The scanning tunnelling microscopy (STM) images of charge density waves (CDW) in transition-metal dichalcogenide 1T-TaSe are theoretically simulated throug... A Kikuchi - 《Surface Science》 被引量: 3发表: 1998年 Band structures of the layer compounds...
Transition-metal dichalcogenides (TMDs) MX2 (M=Ti,Nb,Ta;X=S,Se,Te) exhibit a rich set of charge density wave (CDW) orders, which usually coexist and/or compete with superconductivity. The mechanisms of CDWs and superconductivity in TMDs are still under debate. Here we perform an ...
1T-TaSe 2charge density wavestransition-metal dichalcogeniderealistic electronic structure calculationThe scanning tunnelling microscopy (STM) images of charge density waves (CDW) in transition-metal dichalcogenide 1T-TaSe are theoretically simulated through a realistic electronic structure calculation. The ...
The electronic band structure of 1T-TaSe2 in the commensurate charge density wave (CDW) state has been calculated by using an FLAPW method. We have found that 1T-TaSe2 has quasi-one-dimensional Fermi surface. The result explains well conducting property of 1T-TaX2 (X=Se, S) in the ...
Metallic quasi-two-dimensional transition metal dichalcogenides (TMDCs) 1T-TaS 2 and 1T-TaSe 2 show charge density wave (CDW) at room temperature. These ... HJ Crawack,C Pettenkofer - 《Solid State Communications》 被引量: 23发表: 2001年 Alkali displacements in intercalated 1T-TaSe2 Single ...
The scanning tunnelling microscopy (STM) images of charge density waves (CDW) in transition-metal dichalcogenide 1T-TaSe are theoretically simulated through a realistic electronic structure calculation. The simulation of STM/STS spectrum is executed by means of surface local-density of states (LDOS) ...
This result means that the displacement of Ta atoms by the CCDW is directly observed in real space and suggests that a coherent CDW forms on every layer of 1T-TaSe_2.Keita KobayashiResearch Center for Ultra-High Voltage Electron MicroscopyHidehiro Yasuda...