Mandal Group at Texas A&M

Microscopic Theory of Polaron-Polariton Dispersion and Propagation We develop an analytical, microscopic theory to describe polaron-polariton dispersion, formed by hybridizing excitons, photons, and phonons, as well as their coherent dynamics inside optical cavities....

We are excited share our second publication, live now at Nano Letters!!

Logan, Arshath, and Saeed develop a microscopic theory of exciton-polariton dispersion and propagation that explains several experimental observations!

pubs.acs.org/doi/10.1021/...

Mean-field mixed quantum-classical approach for many-body quantum dynamics of exciton polaritons Coupling material excitations to photons inside optical cavities has been experimentally shown to give rise to a wide range of exotic quantum phenomena, and such light--matter hybrid systems have been...

Pleased to share that the first work from our group has been selected as an Editors’ Suggestion in Physical Review B!

journals.aps.org/prb/abstract...

Excited to share our new work on arXiv (arxiv.org/abs/2508.11237)! 🎉 Arshath and Saeed show that tilting a material inside an optical cavity can induce a Moiré-like effect—even in a single layer—and enable the emergence of flat bands!!!

Excited to share that our very own Logan Blackham has been awarded the NSF GRFP !! @tamuchemistry.bsky.social

Happy to be part of this group :)

Wrapped up another semester with good vibes and birthday cake — happy birthday, Saeed! @mandalgroup.bsky.social

Mean-field Mixed Quantum-Classical Approach for Many-Body Quantum Dynamics of Exciton-Polaritons In this work, we use a mixed quantum-classical (mean-field) many-body approach for simulating the quantum dynamics of excitons and exciton-polaritons beyond the single-excitation subspace. We combine ...

Excited to share our new preprint, led by our very own Pritha (grad student), on developing a mean-field many-body Ehrenfest approach for simulating exciton-polariton beyond the single excited subspace!! check out: arxiv.org/abs/2505.04044

From simulations to swings! TAMU theory crew took a break from equations to hit Topgolf — turns out we can handle more than just models! @mandalgroup.bsky.social

Very excited to share that our very own Saeed R. Koshkaki has won the Löwdin Postdoctoral Research award for his work on coherent polariton transport in multilayered materials at the Sanibel Symposium!!
Here's his preprint: arxiv.org/abs/2502.12933

Exciton-Polariton Dynamics in Multilayered Materials Coupling excitons with quantized radiation has been shown to enable coherent ballistic transport at room temperature inside optical cavities. Previous theoretical works employ a simple description of ...

Excited to share our second preprint! Check out this excellent work from Saeed, Logan and Arshath!!!
arxiv.org/abs/2502.12933

Light–matter interaction Hamiltonians in cavity quantum electrodynamics When matter is strongly coupled to an optical cavity, new hybrid light–matter states are formed, the so-called polariton states. These polaritons can qualitativ

Sharing our recent article at Chem. Phys. Rev.!
Happy to see it selected as a Featured article :)
doi.org/10.1063/5.02...

Our group is expanding !!!!

Microscopic Theory of Polaron-Polariton Dispersion and Propagation We develop an analytical microscopic theory to describe the polaron-polariton dispersion, formed by hybridizing excitons, photons, and phonons, and their coherent dynamics inside optical cavities. Starting from a microscopic light-matter Hamiltonian, we derive a simple analytical model by pursuing a non-perturbative treatment of the phonon and photon couplings to excitons. Within our theoretical framework, the phonons are treated as classical fields that are then quantized via the Floquet formalism. We show that, to a good approximation, the entire polaron-polariton system can be described using a band picture despite the phonons breaking translational symmetry. Our theory also sheds light on the long-lived coherent ballistic motion of exciton-polaritons with high excitonic character that propagate with group velocities lower than is expected from pure exciton-polariton bands, offering a microscopic explanation for these puzzling experimental observations.

Super excited to share our first work at Texas A&M!
Excellent work from Logan, Arshath, and Saeed!!!!

arxiv.org/abs/2501.16622

North family smiling all next to each other.

Through an endowed gift from the family of chem prof Dr. Simon North, Texas A&M Chemistry undergrads can now participate in paid summer research programs without leaving Aggieland, gaining the same transformative experiences typically offered on other campuses. artsci.tamu.edu/news/2024/12...

Excited to share this recent work with @djasras.bsky.social ! We introduce an interesting real-space framework to describe light-matter interactions inside optical cavities!

We had Prof Liang-Yan Hsu visit our group last week! He taught us about plasmonics and cavity free qed effects!!

Excited to share that our brilliant postdoc, Saeed R. Koshkaki (@planetquantum.bsky.social), has been awarded a APS Postdoc Travel Award! 🎉 Don’t miss his talk at the March Meeting, where he’ll present his exciting research from our group!!!!

Our group meetings are in full swing! @sachithpw.bsky.social gave a great talk on quantum trajectories- which pritha (grad student) found quite amusing :D

We are all set with our new instrument that enable microwave radiation induced thermal fluctuations in edible (also in non edibles as it turns out) materials !!
Also- I have been told that the plastic plant has increased productivity by upto 12% among graduate students :D

Our first group photo!!!! #chemsky
@tamuchemistry.bsky.social

Thanks :)

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We had our first visitor to our group — Dr. Chong Sun from Microsoft Quantum/Rice!