Jivesh Kaushal

Time-resolving electron-core dynamics during strong-field ionization in circularly polarized fields

Electron-core interactions play a key role in strong-field ionization and the formation of photoelectron spectra. We analyse the temporal dynamics of strong field ionization associated with these interactions using the time-dependent analytical R-matrix (ARM) method, developed in our previous work [J. Kaushal and O. Smirnova, Phys. Rev. A 88, 013421 (2013)]. The approach is fully quantum but includes the concept of trajectories. However, the trajectories are not classical in the sense that they have both real and imaginary components all the way to the detector. We show that the imaginary parts of these trajectories, which are usually ignored, have a clear physical meaning and are crucial for the correct description of electron-core interactions after ionization. In particular, they give rise to electron deceleration, as well as dynamics associated with electron recapture and release. Our approach is analytical and time-dependent, and allows one to gain access to the electron energy distribution and ionization yield as a function of time. Thus we can also rigorously answer the question: when is ionization completed?

Opportunities for detecting ring currents using an attoclock setup

Strong field ionization by circularly polarized laser fields from initial states with internal orbital momentum has interesting propensity rule: electrons counter-rotating with respect to the laser field can be liberated more easily than co-rotating electrons [Barth and Smirnova PRA 84, 063415, 2011}]. Here we show that application of few-cycle IR pulses allows one to use this propensity rule to detect ring currents associated with such quantum states, by observing angular shifts of the ejected electrons. Such shifts present the main observable of the attoclock method. We use time-dependent Analytical

Nonlinear pulse propagation in chalcogenide As 2 Se 3 glass photonic crystal fiber using RK4IP method

R

Numerical demonstration of soliton dynamics in chalcogenide As2Se3 glass photonic crystal fiber

-Matrix (A

Electron spin polarization in strong-field ionization and the effect of spin in attoclock measurements

R

An Analytic R-matrix Approach to Strong Field Ionization: Coulomb and Correlation Effects

M) theory to show that the attoclock measured angular shifts of an electron originating from two counter-rotating orbitals (

Attoclock measurements of strong-field ionization times

p^{+}

Attoclock Revisited: Effects of Long Range Potentials on Strong Field Ionisation

and

Numerical analysis of Soliton Propagation in Highly Nonlinear Photonic Crystal Fiber

p^{-}

Study of Self Phase Modulation in Chalcogenide Glass Photonic Crystal Fiber

) are noticeably different. Our work opens new opportunities for detecting ring currents excited in atoms and molecules, using the attoclock set-up.