2020年1月6日 · Our results indicate that electron correlation induces a robust Mott insulator state in single-layer 1T-TaSe 2 that is accompanied by unusual orbital texture. Interlayer coupling weakens the...

2021年8月19日 · Spectroscopic imaging of isolated single-layer 1T-TaSe 2 reveals long-wavelength super-modulations at Hubbard band energies, consistent with the predicted behaviour of itinerant spinons.

1998年2月1日 · The scanning tunnelling microscopy (STM) images of charge density waves (CDW) in transition-metal dichalcogenide 1T-TaSe 2 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) making use of Tersoff and Hamann's formula.

2021年10月7日 · Here we report a strong-coupling 2D CDW-Mott phase with a transition temperature onset of ~530 K in monolayer 1T-TaSe 2. Furthermore, the electron correlation derived lower Hubbard band survives...

2024年4月15日 · In this work, we report a controlled epitaxial growth of monolayer TaSe 2 with different structural phases, 1H and 1 T, on a bilayer graphene (BLG) substrate using molecular beam epitaxy, and its impact on the electronic properties of the heterostructures using angle-resolved photoemission spectroscopy. 1H-TaSe 2 exhibits significant charge ...

We present the electronic characterization of single-layer 1H-TaSe 2 grown by molecular beam epitaxy using a combined angle-resolved photoemission spectroscopy, scanning tunneling microscopy/spectroscopy, and density functional theory calculations. We demonstrate that 3 × 3 charge-density-wave (CDW) order persists despite distinct changes in ...

2023年8月9日 · Herein, we report the direct identification of defects of few layer 2H-TaSe 2 on Au foils achieved by chemical vapor deposition and their interactions with charge density wave (CDW) order via scanning tunneling microscopy (STM). Four types of defects in 2H-TaSe 2 are revealed by STM images and density functional theory (DFT) simulations, which ...

2019年12月23日 · Combining the molecular beam epitaxy growth, scanning tunneling microscopy measurements and first-principles calculations, we prepare monolayer 1 T -TaS 2 and TaSe 2 and explore their electronic structures at the atomic scale. Both two-dimensional (2D) compounds exhibit commensurate charge density wave phase at low temperature.

1990年11月15日 · Atomic force microscopy (AFM) and scanning tunneling microscopy (STM) images of 1T-TaSe 2 and 1T-TaS 2 at room temperature reveal both atoms and charge-density waves (CDW’s). In AFM the atoms and CDW’s have comparable amplitudes. In contrast, in STM the CDW’s have amplitudes up to an order of magnitude larger than the atoms.

2021年9月20日 · Using scanning tunneling microscopy/spectroscopy (STM/STS), we investigate the local atomic and electronic structure of the archetype charge density wave (CDW) system TaSe 2.