| Description: | [Gluon - The Physics Journal Club] Mr. Sankha Subhra Bakshi, IPhD Student, (HRI) -- Nonequilibrium dynamics of suppression, revival, and loss of charge order in a laser-pumped electron-phonon system |
| Date: | Monday, Mar 13, 2023 |
| Time: | 5 p.m. - 6 p.m. |
| Venue: | Meghnad Saha Lecture Theatre |
| Details: | Electrons and vibrations in a material can interact strongly, leading to the formation of ordered patterns. Laser pulses can disturb this order, causing oscillations or even destroying it altogether. Recent development in probing techniques made it possible to access the highly out-of-equilibrium dynamics of the ordered patterns. Theoretical studies can help shed light on these phenomena but understanding the dynamics of such systems can be challenging due to the inability to access timescales long enough to reach steady state. In the present study, we used a mean field approach to study the dynamics of the CO state in the Holstein model system subjected to a laser pulse. We found that as the strength of the pulse approached a critical value, the charge order was rapidly destroyed but as time passes the CO recovers to a suppressed value after a time. This time diverges while the suppressed value of the steady state CO goes to zero as we approach the critical value. This behavior can be explained in terms of energy redistribution and system size. Our present results are appropriate for thermally isolated systems like cold atom assemblies. We have adapted the method to also study driven Mott insulators. |
| Calendar: | Seminar Calendar (entered by sangita.jr) |