Photoinduced Non-thermal Topological Phase Transition in Bi2 Se3 Driven by Coherent Interlayer Vibrations
2022 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)(2022)
摘要
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 Bi
2
Se
3
, 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.
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关键词
Phase Transition,Topological States,Interlayer Vibration,Surface States,Topological Insulators,Phase Switching,Switching Topologies,Ultrafast Spectroscopy,Ultrafast Timescales,Vibrational Modes,Photoexcitation,Optical Pulse,Decrease In Conductivity,Function Of Delay,Optical Pumping,Strong Spin-orbit Coupling,Function Of Time Delay,Pump Fluence,Conductance Modulation
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