Jonathan Keeling "Electrical doping and strong light-ma3er coupling"

Abstract

In this talk I will discuss three examples illustra4ng the interplay between electrical doping and
strong light-ma:er coupling. First, I will consider doped inorganic polariton condensates,
where the compe44on between Coulomb interac4ons, popula4on imbalance, and the
extremely light polariton mass leads to a rich phase diagram that includes unconven4onal
paired states and the emergence of a "crescent" phase that simultaneously exhibits pairing
and a metallic Fermi surface [1]. Second, I will discuss Fermi polarons in doped transi4on-
metal dichalcogenides, showing how the nature of polaron forma4on depends on whether the
excess carriers are dis4nguishable from, or iden4cal to, those forming the exciton, leading to
qualita4vely different op4cal signatures and many-body states [2]. Finally, I will turn to organic
polaritons, where strong coupling can influence charge transport by modifying the vibra4onal
structure of molecular excita4ons. Using a microscopic model, I will show how polariton
forma4on can enhance or suppress charge-hopping processes through the mechanism of
polaron decoupling [3].
Together, these examples highlight the diverse ways in which electrical doping and strong
light-ma:er coupling can cooperate to generate novel effects, providing new opportuni4es to
manipulate both op4cal and electronic proper4es.
References
[1] A. Strashko, F. M. MarcheP, A. H. MacDonald, and J. Keeling. Phys. Rev. Le:. 125 067405 (2020)
[2] A. Tiene, J. Levinsen, M. M. Parish, A. H. MacDonald, J. Keeling, and F. M. MarcheP. Phys. Rev.
Res. 2 023089 (2020)
[3] M. A. Zeb, P. G. Kirton, and J. Keeling. Phys. Rev. B 106 195109 (2022)