Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals<xref rid="cpb_27_8_086301_fn1" ref-type="fn">*</xref><fn id="cpb_27_8_086301_fn1"><label>*</label><p>Project supported by the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation from NSFC and CASC, China (Grant No. U1537204), the National Key Research and Development Program of China (Grant No. 2017YFA0206301), and the National Natural Science Foundation of China (Grant No. 51702146).</p></fn>

Unconventional lattice dynamics in few-layer h-BN and indium iodide crystals**

Project supported by the Major Program of Aerospace Advanced Manufacturing Technology Research Foundation from NSFC and CASC, China (Grant No. U1537204), the National Key Research and Development Program of China (Grant No. 2017YFA0206301), and the National Natural Science Foundation of China (Grant No. 51702146).

Hu Gan^{1, 2}, Huang Jian-Qi^{1, 2}, Wang Ya-Ning^{1, 2}, Yang Teng^{1, 2, †}, Dong Bao-Juan^{1, 2}, Wang Ji-Zhang^{1, 2}, Zhao Bo³, Ali Sajjad^{1, 2}, Zhang Zhi-Dong^{1, 2}

(color online) (a) Definition of all the components of force constant. (b) Dispersion relation of ZA mode of InI as a function of force constant or at the 2nd nn. Dispersion from a linear to quadratic behavior is obtained with varying or .