Robust field-dressed spectra of diatomics in an optical lattice

Abstract

The absorption spectra of the cold Na2 molecule dressed by a linearly polarized standing laser wave is investigated. In the studied scenario the rotational motion of the molecules is frozen while the vibrational and translational degrees of freedom are accounted for as dynamical variables. In such a situation a light-induced conical intersection (LICI) can be formed. To measure the spectra a weak field is used whose propagation direction is perpendicular to the direction of the dressing field but has identical polarization direction. Although LICIs are present in our model, the simulations demonstrate a very robust absorption spectrum, which is insensitive to the intensity and the wavelength of the dressing field and which does not reflect clear signatures of light-induced nonadiabatic phenomena related to the strong mixing between the electronic, vibration and translational motions. However, by widening artificially the very narrow translational energy level gaps, the fingerprint of the LICI appears to some extent in the spectrum.

Topological aspects of cavity‐induced degeneracies in polyatomic molecules

“…focused on diatomic molecules [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], but there are quite a lot of polyatomic results as well [41][42][43][44][45][46], that clearly demonstrate how the LICIs can affect and control the different spectroscopic and molecular dynamic properties. Among these studies, the topological consequences of lightinduced nonadiabaticity have also been investigated, both in time-independent [26,27] and time-dependent adiabatic [36] pictures.…”

Polariton Induced Conical Intersection and Berry Phase

“…[13][14][15][16][17][18][19][20][21] In addition, CIs introduce a nontrivial geoemtric phase, commonly referred to as the Berry phase, 22 for electronic wavefunctions that causes a sign change of the electron wavefunctions when the nuclei complete a closed path around the CI. [22][23][24][25][26][27] Both enhanced non-adiabatic transitions and the geometric phase are attributed to as characteristic features of the In addition to the intrinsic CIs in polyatomic molecules, CIs can also be created by either standing 29,30 or running [31][32][33] laser waves in a diatomic molecule. This type of CIs are artificially created through light-matter interactions, and are commonly referred to as the light-induced conical intersection (LICI).…”

“…This type of CIs are artificially created through light-matter interactions, and are commonly referred to as the light-induced conical intersection (LICI). 29,30 For diatomic molecules, the angle between the molecular axis and the polarization axis of the classical laser field gives rise to a rotational motion which constitutes a new degrees of freedom (DOF) that allows forming CIs. In polyatomic molecules, LICIs can be formed even without rotation due to the presence of several vibrational degrees of freedom.…”

Polariton Induced Conical Intersection and Berry Phase

“…[22][23][24][25][26][27] Both enhanced non-adiabatic transitions and the geometric phase are attributed to as characteristic features of the presence of CIs. 8,25,26,28 In addition to the intrinsic CIs in polyatomic molecules, CIs can also be created by either standing 29,30 or running [31][32][33] laser waves in a diatomic molecule. This type of CIs are artificially created through light-matter interactions, and are commonly referred to as the light-induced conical intersection (LICI).…”