Ferroelectric switching in bilayer 3R MoS2 via interlayer shear mode driven by nonlinear phononics

Title
Ferroelectric switching in bilayer 3R MoS2 via interlayer shear mode driven by nonlinear phononics
Authors
최정혜여인원한규승박재홍황철성
Issue Date
2019-10
Publisher
Scientific Reports
Citation
VOL 9-14919-9
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/70084
ISSN
2045-2322
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KIST Publication > Article
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