报告题目 (Title)：Probing Molecular Dynamics in Space-Time with THz-Radiation Coupled STM

报告人 (Speaker)：夏云鹏 博士（UC Irvine）

报告时间 (Time)：2025年12月11日（周四）10:00-11:30

报告地点 (Place)：宝山校区G601

邀请人(Inviter)：李杰

主办部门：量子科技研究院/理学院物理系

报告摘要：

In contrast to all other microscopes, a two-level system (TLS) based scanning tunneling microscope (STM), combining ultrafast coherent light, is unique in incorporating the quantum superposition principle in its operation. This technique uses the superposition of two levels in a single molecule as the sensor to advance precision measurement with simultaneous space and time resolutions. Its operation involves irradiation of the STM junction with femtosecond radiation and records in the time domain coherent oscillations of the occupation of the two-level states. The oscillation frequency and decoherence time exhibit extreme sensitivity to the sensor's environment. The common occurrence of systems with two levels within a double-well potential suggests broad applications of the technique in sensing the static and dynamic properties in quantum systems and materials at the atomic scale.

References:

[1] L. Wang, Y Xia, W. Ho, Science 376,401-405 (2022).

[2] L. Wang, D. Bai, Y, Xia, W. Ho, Phys. Rev. Lett. 130,096201 (2023).

[3] Y Xia, L. Wang, D. Bai, W. Ho, ACS Nano 17,23144-23151 (2023).

[4] Y Xia, L. Wang, W. Ho, Phys. Rev. Lett. 132,076903 (2024).