Programme

O.10 -- Oral, VCTP-50

Date: Tuesday, 5 August 2025

Time: 14:40 - 15:05

Theoretical study of a quantum control to create the photon-dressed states using pump lasers

Hirobumi Mineo (1), Quang Huy Ho (2), Ngoc Loan Phan (2)

(1) STAI, Van Lang University, Ho Chi Minh City, Vietnam (2) Department of Physics, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam

Recently, we proposed a photo-control scheme based on the dynamic Stark shift mechanism to create the unidirectional coherent angular momentum in low-symmetric aromatic rings [1,2]. However, compared with the coherent angular momentum induced by the circularly polarized (CP) laser in highly symmetric aromatic ring molecules [3,4], the obtained angular momentum intensities are relatively weaker due to a pulse-train shaped form of the angular momentum. Furthermore, in the above studies, different photo-control approaches were applied to aromatics with different symmetries. Meanwhile, we recently highlighted utilizing the helical-photon-dressed states formed by a CP or elliptically polarized (EP) laser [5] to provide more consistent treatment. This study was verified using a minimal three-electronic-state model. The time-dependent Schrödinger equation was solved within the semi-classical treatment of the light-matter interaction, and rotating wave approximation (RWA) under frozen nuclei condition. We have presented that the two photon-dressed states represent classical rotation; in contrast, the remaining dressed state shows non-classical rotation in low and highly symmetric aromatics. Here, classical rotation means that the unidirectional pi-electron rotation is the same as that of the rotational direction in the rotating electric field determined by the classical equation of motion, whereas non-classical rotation indicates the opposite direction. In the photon-dressed states approach, the dressed states were formed in the presence of the CP or EP laser, however, due to a lack of initial preparation for the dressed states, it is crucial to consider a process for creating the photon-dressed states starting from the ground state using the designed pump lasers. Quantum design of pump lasers is required for dynamical processes to be feasible experimentally. For this purpose, we have analytically designed pump lasers to generate the photon-dressed states in low-symmetric aromatic rings, and show two photo-control approaches using two resonant linearly polarized (LP) lasers, and an EP laser as pump lasers. 1. H. Mineo, M. Yamaki, G.-S. Kim, Y. Teranishi, S. H. Lin, and Y. Fujimura, Phys. Chem. Chem. Phys., 2016, 18, 26786–26795. 2. H. Mineo, Q. H. Ho, N.-L. Phan, and Y. Fujimura, J. Chin. Chem. Soc., 2023, 70, 405. 3. I. Barth, J. Manz, Y. Shigeta, and K. Yagi, J. Am. Chem. Soc., 2006, 128, 7043–7049. 4. K. Nobusada and K. Yabana, Phys. Rev. A, 2007, 75, 032518. 5. H. Mineo, Q. H. Ho, N.-L. Phan, G.S. Kim, and Y. Fujimura, J. Chem. Phys., 2024, 161, 194311.

Presenter: mineo hirobumi