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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Park J,Yeu IW,Han G,Hwang CS,Choi JHdoi
10.1038/s41598-019-50293-ysubject
Has Abstractpub_date
2019-10-17 00:00:00pages
14919issue
1issn
2045-2322pii
10.1038/s41598-019-50293-yjournal_volume
9pub_type
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