arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2412.06751cond-mat.mes-hallphysics.optics
收藏

操控光子修饰电子态的对称性

Manipulating the symmetry of photon-dressed electronic states

Changhua Bao, Michael Schüler, Teng Xiao, Fei Wang, Haoyuan Zhong, Tianyun Lin, Xuanxi Cai, Tianshuang Sheng, Xiao Tang, Hongyun Zhang, Pu Yu, Zhiyuan Sun, Wenhui Duan, Shuyun Zhou

AI总结:

本研究利用偏振依赖的TrARPES直接观测黑磷中Floquet-Bloch态的宇称对称性,发现光场诱导宇称反转及动量依赖“热点”,结合理论揭示导带价带杂化的调控机制,为Floquet工程调控光子修饰电子态提供了范例。

摘要:

强光-物质相互作用通过形成光子修饰电子态(即Floquet-Bloch态),为在超快时间尺度上定制量子材料的物理性质提供了机遇。尽管理论上光场可将其对称性特征印刻到光子修饰电子态上,但迄今为止,如何实验检测并进一步调控光子修饰电子态的对称性仍未明确。本文中,我们借助具备偏振依赖研究能力的时间分辨与角分辨光电子能谱(TrARPES),直接观测了黑磷中Floquet-Bloch态的宇称对称性。光子修饰边带在Γ点处表现出与价带相反的光电子发射强度,表明光场引发了宇称反转。此外,我们观测到一个被限制在Γ点附近、具有强强度的“热点”,说明存在宇称反转之外的动量依赖调制。结合理论计算,我们揭示了由宇称相反的导带与价带杂化所导致的、光诱导的Floquet-Bloch态波函数调控,并证明该“热点”本质上由黑磷的对称性特性决定。本研究表明TrARPES可作为一种直接探测手段,获取光子修饰电子态宇称的能量与动量分辨信息,为通过Floquet工程调控此类光子修饰电子态的波函数与对称性提供了范例。

英文摘要:

Strong light-matter interaction provides opportunities for tailoring the physical properties of quantum materials on the ultrafast timescale by forming photon-dressed electronic states, i.e., Floquet-Bloch states. While the light field can in principle imprint its symmetry properties onto the photon-dressed electronic states, so far, how to experimentally detect and further engineer the symmetry of photon-dressed electronic states remains elusive. Here by utilizing time- and angle-resolved photoemission spectroscopy (TrARPES) with polarization-dependent study, we directly visualize the parity symmetry of Floquet-Bloch states in black phosphorus. The photon-dressed sideband exhibits opposite photoemission intensity to the valence band at the $Γ$ point,suggesting a switch of the parity induced by the light field. Moreover, a "hot spot" with strong intensity confined near $Γ$ is observed, indicating a momentum-dependent modulation beyond the parity switch. Combining with theoretical calculations, we reveal the light-induced engineering of the wave function of the Floquet-Bloch states as a result of the hybridization between the conduction and valence bands with opposite parities, and show that the "hot spot" is intrinsically dictated by the symmetry properties of black phosphorus. Our work suggests TrARPES as a direct probe for the parity of the photon-dressed electronic states with energy- and momentum-resolved information, providing an example for engineering the wave function and symmetry of such photon-dressed electronic states via Floquet engineering.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑