Interactions between Fermi polarons in monolayer WS2

Jack B. Muir, Jesper Levinsen, Stuart K. Earl, Mitchell A. Conway, Jared H. Cole, Matthias Wurdack, Rishabh Mishra, David J. Ing, Eliezer Estrecho, Yuerui Lu, Dmitry K. Efimkin, Jonathan O. Tollerud, Elena A. Ostrovskaya, Meera M. Parish and Jeffrey A. Davis ()
Additional contact information
Jack B. Muir: Swinburne University of Technology
Jesper Levinsen: Monash University
Stuart K. Earl: Swinburne University of Technology
Mitchell A. Conway: Swinburne University of Technology
Jared H. Cole: RMIT Uinversity
Matthias Wurdack: The Australian National University
Rishabh Mishra: Swinburne University of Technology
David J. Ing: RMIT University
Eliezer Estrecho: The Australian National University
Yuerui Lu: The Australian National University
Dmitry K. Efimkin: Monash University
Jonathan O. Tollerud: Swinburne University of Technology
Elena A. Ostrovskaya: The Australian National University
Meera M. Parish: Monash University
Jeffrey A. Davis: Swinburne University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Interactions between quasiparticles are of fundamental importance and ultimately determine the macroscopic properties of quantum matter. A famous example is the phenomenon of superconductivity, which arises from attractive electron-electron interactions that are mediated by phonons or even other more exotic fluctuations in the material. Here we introduce mobile exciton impurities into a two-dimensional electron gas and investigate the interactions between the resulting Fermi polaron quasiparticles. We employ multi-dimensional coherent spectroscopy on monolayer WS2, which provides an ideal platform for determining the nature of polaron-polaron interactions due to the underlying trion fine structure and the valley specific optical selection rules. At low electron doping densities, we find that the dominant interactions are between polaron states that are dressed by the same Fermi sea. In the absence of bound polaron pairs (bipolarons), we show using a minimal microscopic model that these interactions originate from a phase-space filling effect, where excitons compete for the same electrons. We furthermore reveal the existence of a bipolaron bound state with remarkably large binding energy, involving excitons in different valleys cooperatively bound to the same electron. Our work lays the foundation for probing and understanding strong electron correlation effects in two-dimensional layered structures such as moiré superlattices.

Date: 2022
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DOI: 10.1038/s41467-022-33811-x

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