Coherent control of interlayer vibrations in Bi<sub>2</sub>Se<sub>3</sub> van der Waals thin-films
Tae Gwan Park, Hong Ryeol Na, Seung‐Hyun Chun, Won Bae Cho, Sunghun Lee, Fabıan Rotermund
Abstract
as a promising optoelectronic and thermoelasticity material in layered structures using a coherently controlled pump and probe scheme. The observed thickness-dependent fast interlayer breathing modes and substrate-induced slow interfacial modes can be exactly explained by a modified linear chain model including coupling effect with substrate. In addition, the results of coherent control experiments also agree with the simulation results based on the interference of interlayer vibrations. This investigation is universally applicable for diverse 2D materials and provides insight into the interlayer vibration-related dynamics and novel device implementation based on an ultrafast timescale interlayer-spacing modulation scheme.