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Spin splitting and strain in epitaxial monolayer WSe$_2$ on graphene by Nakamura, H.; Mohammed, A.; Rosenzweig, P.; Matsuda, K.; Nowakowski, K.; Küster, K.; Wochner, P.; Ibrahimkutty, S.; Wedig, U.; Hussain, H.; Rawle, J.; Nicklin, C.; Stuhlhofer, B.; Cristiani, G.; Logvenov, G.; Takagi, H.; Starke, U. is a scholarly article available to read on EtoBox.

What is Spin splitting and strain in epitaxial monolayer WSe$_2$ on graphene about?

We present the electronic and structural properties of monolayer WSe$_{2}$ grown by pulsed-laser deposition on monolayer graphene (MLG) on SiC. The spin splitting in the WSe$_{2}$ valence band at $\overline{\mathrm{K}}$ was $\Delta_\mathrm{SO}=0.469\pm0.008$ eV by angle-resolved photoemission spectroscopy (ARPES). Synchrotron-based grazing-incidence in-plane X-ray diffraction (XRD) revealed the in-plane lattice constant of monolayer WSe$_{2}$ to be $a_\mathrm{WSe_2}=3.2757\pm0.0008 \mathrm{\r{A}}$. This indicates a lattice compression of -0.19 % from bulk WSe$_{2}$. By using experimentally determined graphene lattice constant ($a_\mathrm{MLG}=2.4575\pm0.0007 \mathrm{\r{A}}$), we found that a 3$\times$3 unit cell of the slightly compressed WSe$_{2}$ is perfectly commensurate with a 4$\times$4 graphene lattice with a mismatch below 0.03 %, which could explain why the monolayer WSe$_{2}$ is compressed on MLG. From XRD and first-principles calculations, however, we conclude that the observed size of strain is negligibly small to account for a discrepancy in $\Delta_\mathrm{SO}$ found between exfoliated and epitaxial monolayers in earlier ARPES. In addition, angle-resolved, ultraviolet

Author

Nakamura, H.; Mohammed, A.; Rosenzweig, P.; Matsuda, K.; Nowakowski, K.; Küster, K.; Wochner, P.; Ibrahimkutty, S.; Wedig, U.; Hussain, H.; Rawle, J.; Nicklin, C.; Stuhlhofer, B.; Cristiani, G.; Logvenov, G.; Takagi, H.; Starke, U.

Published

2019

Language

EN