| AVS 64th International Symposium & Exhibition | |
| 2D Materials Focus Topic | Thursday Sessions |
| Session 2D+MI-ThM |
| Session: | Novel Quantum Phenomena in 2D Materials |
| Presenter: | Wouter Jolie, Institute of Physics II, University of Cologne, Germany |
| Authors: | W. Jolie, Institute of Physics II, University of Cologne, Germany C. Murray, Institute of Physics II, University of Cologne, Germany J. Hall, Institute of Physics II, University of Cologne, Germany F. Portner, Institute for Theoretical Physics, University of Cologne, Germany B. Pielić, Center of Excellence for Advanced Materials and Sensing Devices, Institute of Physics, Zagreb, Croatia N. Atodiresei, Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich, Germany M. Kralj, Center of Excellence for Advanced Materials and Sensing Devices, Institute of Physics, Zagreb, Croatia A. Rosch, Institute for Theoretical Physics, University of Cologne, Germany C. Busse, Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Germany T. Michely, Institute of Physics II, University of Cologne, Germany |
| Correspondent: | Click to Email |
Grain boundaries in monolayer transition metal dichalcogenides (TMDC) are predicted to host one-dimensional metallic states embedded in an otherwise insulating layer. As was shown recently for MoSe2 [1,2], these states may be electronically unstable, undergoing a Peierls transition which leads to a charge density wave (CDW) at low temperatures.
We investigate epitaxial monolayer-MoS2 on graphene on Ir(111) with scanning tunneling microscopy and spectroscopy (STM/STS). We find a large bandgap in MoS2 showing that it is well decoupled from the substrate. The MoS2 islands feature long, straight, highly symmetric twin boundaries. Along these we measure a small bandgap together with periodic beatings in the local density of states, both characteristic of CDWs. We investigate different types of line defects in MoS2 and find correspondingly different CDWs. These quasi-freestanding wires offer an opportunity to study the simple yet rich physics of CDWs, not often seen in true 1D form experimentally. Specifically, we investigate their properties based on symmetry analysis, the impact of point defects, temperature-dependence, phase-behavior and their response to doping.
[1] S. Barja, S. Wickenburg, Z.-F. Liu, Y. Zhang, H. Ryu, M.M. Ugeda, Z. Hussain, Z.-X. Shen, S.-K. Mo, E. Wong, M.B. Salmeron, F. Wang, M.F. Crommie, D.F. Ogletree, J.B. Neaton, A. Weber-Bargioni, Nat. Phys. 12, 751-756 (2016)
[2] Y. Ma, H.C. Diaz, J. Avila, C. Chen, V. Kalappattil, R. Das, M.-H. Phan, T. Čadež, J.M.P. Carmelo, M.C. Asensio, M. Batzill, Nat. Commun. 8, 14231 (2017)