Speaker:
Dr. V. V. Prasad
Cochin University of Science and Technology
First passage statistics with Stochastic resetting
Stochastic resetting has emerged to be an interesting paradigm to study non equilibrium stationary states. Along with several exact results on the stationary measures in various systems, it has also been noticed that stochastic resetting helps to speed up the completion of processes- quantified by the first passage statistics, potentially applicable in areas ranging from chemical synthesis to search processes. In the talk I will briefly introduce the area of stochastic resetting and further discuss our studies on application of landau-like methods in stochastic resetting. Later I will also describe a recent work on the effect of stochastic resetting on a diffusing particle within a two dimensional wedge domain.
Speaker:
Dr. Akanksha Dubey
Technion Israel Institute of Technology, Israel
Attosecond Science- A Pathway to Quantum World
Probing quantum systems has always been a challenge since the advent of quantum physics. The fundamental curiosity to observe electronic motion through the quantum world on its inherent temporal scale- attosecond (1 attosecond = 10^-18 seconds) scale of time, has driven continuous pioneers and discoverers to craft ways/methods for probing it on such ultrafast realms. However, it could be realized only at the dawn of the 21st century. The advancements in the contemporary laser technology made it possible to generate the first attosecond pulses in the year 2001, marking the beginning of a new era- ‘Attosecond Science’; also called ‘Attoscience’. As the name suggests, this new research area deals with study of electron dynamics in matter on attosecond time scale. The importance of this new science is already recognized by the award of Nobel Prize in Physics for the year 2023 to the pioneers of attosecond pulse generation. Steering the electron through the quantum world using intense ultrafast lasers, we are now capable of observing electron dynamics in real-time. This provides unprecedented control on matter, which was not possible two decades ago. Attosecond
science encompasses all research domains across science and engineering streams, where electron dynamics is probed on its intrinsic temporal scale.
In this seminar, I shall take a tour of ultrafast quantum dynamics in molecules and carbon fullerenes; when such systems interact with intense ultrafast laser fields of different polarizations. Using numerical experiments, I shall elucidate some highly nonlinear optical phenomenon and ultrafast processes, such as- high harmonic generation (HHG), charge migration and light-induced quantum
correlations, time-resolved observables using the method of pump-probe spectroscopy, molecular photoemission, above-threshold ionization (ATI) and photoelectron spectrum (PES). I shall explore the origin and underlying physical mechanisms of these ultrafast quantum dynamics in the systems of interest. I shall highlight the importance and applications of such ultrafast processes in the relevant
areas and conclude the seminar by elaborating on the future perspectives and goals.
