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Journal Article

Standing waves induced by valley-mismatched domains in ferroelectric SnTe monolayers

MPS-Authors

Chang,  Kai
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

Yang,  Hao
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin,  Stuart S. P.       
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Citation

Chang, K., Miller, B. J., Yang, H., Lin, H., Parkin, S. S. P., Barraza-Lopez, S., et al. (2019). Standing waves induced by valley-mismatched domains in ferroelectric SnTe monolayers. Physical Review Letters, 122(20): 206402. doi:10.1103/PhysRevLett.122.206402.


Cite as: https://hdl.handle.net/21.11116/0000-0008-DF5C-7
Abstract
Two-dimensional (2D) quasiparticle standing waves originate from the interference of coherent quantum states and are usually created by the scattering off edges, atomic steps, or adatoms that induce large potential barriers. We report standing waves close to the valence band maximum (EV), confined by electrically neutral domain walls of newly discovered ferroelectric SnTe monolayers, as revealed by spatially resolved scanning tunneling spectroscopy. Ab initio calculations show that this novel confinement arises from the polarization lifted hole valley degeneracy and a ∼90° rotation of the Brillouin zones that render holes’ momentum mismatched across neighboring domains. These results show a potential for polarization-tuned valleytronics in 2D ferroelectrics.