Coherent control of interlayer vibrations in Bi2Se3van der Waals thin-films

Tae Gwan Park, Hong Ryeol Na, Seung Hyun Chun, Won Bae Cho, Sunghun Lee, Fabian Rotermund

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Interlayer vibrations with discrete quantized modes in two-dimensional (2D) materials can be excited by ultrafast light due to the inherent low dimensionality and van der Waals force as a restoring force. Controlling such interlayer vibrations in layered materials, which are closely related to fundamental nanomechanical interactions and thermal transport, in spatial- and time-domain provides an in-depth understanding of condensed matters and potential applications for advanced phononic and photonics devices. The manipulation of interlayer vibrational modes has been implemented in a spatial domain through material design to develop novel optoelectronic and phononic devices with various 2D materials, but such control in a time domain is still lacking. We present an all-optical method for controlling the interlayer vibrations in a highly precise manner with Bi2Se3 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.

Original languageEnglish
Pages (from-to)19264-19273
Number of pages10
JournalNanoscale
Volume13
Issue number45
DOIs
StatePublished - 7 Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 The Royal Society of Chemistry.

Fingerprint

Dive into the research topics of 'Coherent control of interlayer vibrations in Bi2Se3van der Waals thin-films'. Together they form a unique fingerprint.

Cite this