Photoinduced Non-thermal Topological Phase Transition in Bi2Se3 Driven by Coherent Interlayer Vibrations

Tae Gwan Park, Junho Park, Eon Taek Oh, Hong Ryeol Na, Seung Hyun Chun, Sunghun Lee, Fabian Rotermund

Research output: Contribution to journalConference articlepeer-review

Abstract

We present the non-thermal route of photoinduced topological phase transition driven by interlayer vibrations. By combining ultrafast optical and THz spectroscopy, which are sensitive to interlayer vibrations through photoelastic effects and Dirac surface state leading to low-energy conductivity in topological insulator Bi2Se3, we found that interfacial modes, which correspond to uniaxial strains and modulate interlayer spacing, involve the photoinduced topological phase switching from topological insulator toward normal insulator. Our observations provide fundamental insight to nanomechanical lattice-topological phase interactions for possible optoelectronic and photonic applications based on optically-driven phase transition switching at ultrafast timescales.

Original languageEnglish
JournalOptics InfoBase Conference Papers
DOIs
StatePublished - 2022
Event2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO/PR 2022 - Sapporo, Japan
Duration: 31 Aug 20225 Sep 2022

Bibliographical note

Publisher Copyright:
© IEEE 2022.

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