4 papers
Uncovering long-lived relaxation channel and exciton-phonon coupling in \textrm{Ta\textsubscript{2}NiSe\textsubscript{5}} via non-degenerate pump-probe spectroscopy
Poulami Ghosh, Anupama Chauhan, Sidhanta Sahu +3
An excitonic insulator represents a quantum phase in which spontaneous condensation of excitons leads to novel many-body phenomena. TaNSi (TNSe), a layered narrow-gap semic…
Terahertz Time-Domain Spectroscopy and Density Functional Theory Analysis of Low-Frequency Vibrational Modes of a Benzoxazolium-Coumarin Donor-pi-Acceptor Chromophore
Sidhanta Sahu, Phalguna Krishna Das Vana, Anupama Chauhan +5
To elucidate low-frequency vibrational modes, we investigate a benzoxazolium--coumarin (BCO+) donor-pi-acceptor derivative using transmission terahertz time-domain spectroscopy (TH…
Ultrafast Dynamics of Spin-Orbit Entangled Excitons Coupled to Magnetic Ordering in van der Waals Antiferromagnet NiPS3
Sidhanta Sahu, Anupama Chauhan, Poulami Ghosh +7
Spin-orbit entangled excitons (SOEE) in two-dimensional (2D) antiferromagnets provide direct access to explore unconventional many body interactions in correlated electron systems.…
Ultrafast dynamics of carriers, coherent acoustic phonons and strain pulses in BiSbTe1.5Se1.5 topological insulator thin films
Anupama Chauhan, Sidhanta Sahu, Poulami Ghosh +6
We Investigate the ultrafast carrier, coherent acoustic phonons (CAPs), and acoustic strain pulse dynamics in topological insulator BiSbTe1.5Se1.5 (BSTS) thin films of varying thic…