Programme

O.16 -- Oral, VCTP-48

Date: Thursday, 3 August 2023

Time: 15:05 - 15:30

Theoretical study of the relation between the dressed states and dynamic Stark shift in presence of non-resonant elliptically polarized laser

Mineo H (1), Ho Q.H. (2), Phan N.L. (2), Fujimura Y (3)

(1) Science and Technology Advanced Institute (STAI), Van Lang University (2) Department of Physics, Ho Chi Minh City University of Education (3) Department of Chemistry, Graduate School of Science, Tohoku University

Owing to the recent development of laser science and technology, the quantum laser control of ultrafast electron dynamics has been explored actively, and laser-induced π-electron rotations and magnetic fields are expected to establish a principle for the next-generation switching or optoelectronics devices. In the past it was commonly accepted that the coherent π-electron rotation could not be generated in low symmetry aromatic ring molecules, which have no degenerate electronic excited state. Recently we demonstrated that the unidirectional π-electron rotation can be generated even in low symmetry aromatic ring molecules using the two linearly polarized lasers under fixed nuclei [1], and the nuclear vibrational effects are also considered in the adiabatic approximation, where a weak coupling of electron-vibrational interaction is assumed [2]. In this talk we show that a stationary angular momentum is generated even in low-symmetry aromatic ring molecule in the photo-dressed state by introducing the relationship between the Stark shift picture and the dressed state picture. It is found that the dressed states are equivalent to the energy eigen states which are formed by two lasers with same frequencies i.e., elliptically polarized laser, and the difference between two pictures is the initial condition at t=0, that is, in the Stark picture only the ground state is initially populated, on the other hand in the dressed state picture, eigen states which consist of the ground and excited states are initially populated. References 1. H. Mineo, M. Yamaki, G.S. Kim, Y. Teranishi, and Y. Fujimura, Phys. Chem. Chem. Phys. 18, 26786 (2016). 2. H. Mineo, N.L. Phan, D.K. La and Y. Fujimura, J. Phys. Chem. A 125, 1476 (2021).

Presenter: Mineo Hirobumi