#  Professor Joel Yuen Zhou (University of California, San Diego) 

 



####  calendar\_today Date and Time 

 **November 14, 2024** 

 04:15PM - 05:15PM EST 

####  pin\_drop Location 

 **Pfizer Lecture Hall**  



 

 



 

 Title: Molecular platforms for magnetic sensing and polaritonics

 Polaritonic and spintronic phenomena are usually designed and studied in solid-state architectures. In this talk, I will discuss unique opportunities that molecular materials offer as platforms for polariton chemistry (polaritonics) and magnetic field sensing (spintronics).

 In the first part, I will describe our recent design of the first class of organic molecules that feature photophysics analogous to nitrogen-vacancy (NV) centers in diamond, and which allow for optically detected magnetic resonance (ODMR) \[1\]; I will also discuss a recent experimental demonstration of this phenomenon \[2\].

 In the second part, I will describe the collective strong coupling regime where N molecules couple to an optical cavity mode. Molecular polaritons may be regarded as quantum impurity models (Fig. 1), where the impurity is a photon and the complex anharmonic molecular degrees of freedom serve as a bath. If this bath is large enough (N>>1), as in the case of most molecular polariton experiments, the quantum dynamics of such a system becomes very simple to compute \[3,4,5\], as demonstrated in our recent method, Collective Dynamics using Truncated Equations (CUT-E) \[3,4,5\]. The conceptual implications of this method are also discussed in light of recent experiments in polariton chemistry \[6\]. Intriguing consequences of finite N effects are discussed and linked to effects of the cavity quantum vacuum which can be proved in high Q cavities.

1. Y. R. Poh, D. Morozov, N. P. Kazmierczak, R. G. Hadt, G. Groenhof, and J. Yuen-Zhou, Alternant hydrocarbon diradicals as optically addressable molecular qubits, J. Am. Chem. Soc. 146, 22, 15549 (2024).
2. S. M. Kopp, S. Nakamura, B. T. Phelan, Y. Rui Poh, S. B. Tyndall, P. J. Brown, Y. Huang, J. Yuen-Zhou\*, M. D. Krzyaniak, M. R. Wasielewski, Luminescent organic triplet diradicals as optically addressable molecular qubits, J. Am. Chem. Soc. 146, 40, 27935–27945 (2024).
3. K. Schwennicke and J. Yuen-Zhou, Extracting accurate light–matter couplings from disordered polaritons, Nanophotonics 0049 (2024).
4. J. B. Pérez-Sánchez, A. Koner, N. P Stern, and J. Yuen-Zhou, Simulating molecular polaritons in the collective regime using few-molecule models, Proc. Nat. Acad. Sci. 120(15) e2219223120 (2023).
5. J. Pérez-Sánchez, F. Mellini, N. C. Giebink, and J. Yuen-Zhou, Collective polaritonic effects on chemical dynamics suppressed by disorder, Phys. Rev. Res. 1, 013222 (2024).
6. J. Yuen-Zhou and A. Koner, Linear response of molecular polaritons, J. Chem. Phys. 160, 154107 (2024).



 

 



 

 See also:- [ Woodward CCB Departmental Colloquium ](/seminars/woodward-ccb-departmental-colloquium)
 
 

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