| AVS 64th International Symposium & Exhibition | |
| 2D Materials Focus Topic | Thursday Sessions |
| Session 2D+AS+SS-ThA |
| Session: | Dopants, Defects, and Interfaces in 2D Materials |
| Presenter: | Horacio Coy Diaz, University of South Florida |
| Authors: | H. Coy Diaz, University of South Florida M. Batzill, University of South Florida |
| Correspondent: | Click to Email |
In monolayer van der Waals-materials, grain boundaries become one-dimensional (1D) line defects. Here we show using angle resolved photoemission spectroscopy (ARPES) that twin-grain boundaries in the 2D semiconductor MoSe2 exhibit parabolic metallic bands. The 1D nature is evident from a charge density wave transition, whose periodicity is given by kF/p, where the Fermi momentum kF is determined by ARPES. Most importantly, we provide evidence for spin- and charge-separation, the hallmark of 1D quantum liquids. ARPES shows that the spectral line splits into distinctive spinon and holon excitations whose dispersions exactly follow the energy-momentum dependence calculated by 1D Hubbard model, with suitable finite-range interactions. Our results also imply that quantum wires and junctions can be isolated in line defects in 2D materials, which may enable quantum transport measurements and devices.