Ferroelectric switching in bilayer 3R MoS2 via interlayer shear mode driven by nonlinear phononics
| Autor: | Cheol Seong Hwang, Gyuseung Han, Jae-Hong Park, Jung-Hae Choi, In Won Yeu |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Multidisciplinary
Materials science Nanoscale materials Condensed matter physics Infrared Phonon lcsh:R Anharmonicity Stacking lcsh:Medicine 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Ferroelectricity Article Condensed Matter::Materials Science Zigzag 0103 physical sciences First principle Atomistic models lcsh:Q lcsh:Science 010306 general physics 0210 nano-technology |
| Zdroj: | Scientific Reports Scientific Reports, Vol 9, Iss 1, Pp 1-9 (2019) |
| ISSN: | 2045-2322 |
| Popis: | We theoretically investigate the mechanism of ferroelectric switching via interlayer shear in 3R MoS2 using first principles and lattice dynamics calculations. First principle calculations show the prominent anharmonic coupling of the infrared inactive interlayer shear and the infrared active phonons. The nonlinear coupling terms generates an effective anharmonic force which drives the interlayer shear mode and lowers the ferroelectric switching barrier depending on the amplitude and polarization of infrared mode. Lattice dynamics simulations show that the interlayer shear mode can be coherently excited to the switching threshold by a train of infrared pulses polarized along the zigzag axis of MoS2. The results of this study indicate the possibility of ultrafast ferroelectricity in stacked two-dimensional materials from the control of stacking sequence. |
| Databáze: | OpenAIRE |
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