Attractive and Repulsive Exciton-Polariton Interactions Mediated by an Electron Gas

Bastarrachea-Magnani, Miguel A.; Camacho-Guardián, Arturo; Bruun, Georg M.

doi:10.1103/physrevlett.126.127405

Cited by 25 publications

(20 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The last term is a contribution coming from a non-zero population of the trion state, which appears as a pole in the many-body scattering matrix at the energy ω tr k with residue Z tr k . This results in an interaction between the trions and the excitons mediated by the exchange of an electron [69], which has been observed to give rise to large optical non-linearities. We neglect this term in the following assuming a zero population of trions and refer the reader to Ref.…”

Section: Non-zero Polaron-polariton Densitymentioning

confidence: 99%

“…Equation ( 19) is illustrated diagrammatically in Figure 4, which shows that it corresponds to an induced interaction between two polaron-polaritons mediated by particle-hole excitations of the electron gas. Indeed, when the polaron-polariton energy is detuned far from the trion energy one can approximate the scattering matrices in Equation ( 19) by the constant T T (0, ξ kσ ), and the interaction becomes proportional to the 2D Lindhard function [69], which is characteristic of a particle-hole mediated interaction [71]. For stronger interactions between the excitons and the electrons, one must retain the full energy and momentum dependence of the scattering matrix in Equation (19).…”

Section: Non-zero Polaron-polariton Densitymentioning

confidence: 99%

“…So far, one has instead observed a temporary positive energy shift corresponding to a repulsive interaction, which has been attributed to a non-equilibrium phase filling effect [58]. It would thus be very interesting to investigate this further experimentally as the effective interaction between quasiparticles is a key component of Landau's quasiparticle theory and because it may give rise to strong non-linear optical effects [69,87].…”

Section: Non-zero Polaron-polariton Densitymentioning

confidence: 99%

See 2 more Smart Citations

Polaritons in an Electron Gas—Quasiparticles and Landau Effective Interactions

Bastarrachea-Magnani

Thomsen

Camacho-Guardián

et al. 2021

Atoms

Self Cite

View full text Add to dashboard Cite

Two-dimensional semiconductors inside optical microcavities have emerged as a versatile platform to explore new hybrid light–matter quantum states. A strong light–matter coupling leads to the formation of exciton-polaritons, which in turn interact with the surrounding electron gas to form quasiparticles called polaron-polaritons. Here, we develop a general microscopic framework to calculate the properties of these quasiparticles, such as their energy and the interactions between them. From this, we give microscopic expressions for the parameters entering a Landau theory for the polaron-polaritons, which offers a simple yet powerful way to describe such interacting light–matter many-body systems. As an example of the application of our framework, we then use the ladder approximation to explore the properties of the polaron-polaritons. Furthermore, we show that they can be measured in a non-demolition way via the light transmission/reflection spectrum of the system. Finally, we demonstrate that the Landau effective interaction mediated by electron-hole excitations is attractive leading to red shifts of the polaron-polaritons. Our work provides a systematic framework to study exciton-polaritons in electronically doped two-dimensional materials such as novel van der Waals heterostructures.

show abstract

Section: Non-zero Polaron-polariton Densitymentioning

confidence: 99%

Section: Non-zero Polaron-polariton Densitymentioning

confidence: 99%

Section: Non-zero Polaron-polariton Densitymentioning

confidence: 99%

See 1 more Smart Citation

Polaritons in an Electron Gas—Quasiparticles and Landau Effective Interactions

Bastarrachea-Magnani

Thomsen

Camacho-Guardián

et al. 2021

Atoms

Self Cite

View full text Add to dashboard Cite

show abstract

“…( 12) for the exciton self-energy. For a non-zero density of excitons, evaluating the Matsubara sum yields [69] Σ…”

Section: B Non-zero Polaron-polariton Densitymentioning

confidence: 99%

Polaritons in an electron gas -- quasiparticles and Landau effective interactions

Bastarrachea-Magnani,

Thomsen,

Camacho-Guardian

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Two-dimensional semiconductors inside optical microcavities have emerged as a versatile platform to explore new hybrid light-matter quantum states. The strong light-matter coupling leads to the formation of exciton-polaritons, which in turn interact with the surrounding electron gas to form quasiparticles called polaron-polaritons. Here, we develop a general microscopic framework to calculate the properties of these quasiparticles such as their energy and the interactions between them. From this, we give microscopic expressions for the parameters entering a Landau theory for the polaron-polaritons, which offers a simple yet powerful way to describe such interacting lightmatter many-body systems. As an example of the application of our framework, we then use the ladder approximation to explore the properties of the polaron-polaritons. We furthermore show that they can be measured in a non-demolition way via the light transmission/reflection spectrum of the system. Finally, we demonstrate that the Landau effective interaction mediated by electronhole excitations is attractive leading to red shifts of the polaron-polaritons. Our work provides a systematic framework to study exciton-polaritons in electronically doped two-dimensional materials such as novel van der Waals heterostructures.

show abstract

“…In solid-state physics, a polaron state describes electrons dressed by lattice phonons [24][25][26][27][28][29]. The Fermi polaron, describing a mobile impurity in a degenerate Fermi gas has attracted renewed attention in ultracold atomic gases [30][31][32][33][34][35][36][37][38][39][40][41][42][43] and has also been recently observed in monolayer semiconductors [44,45] when exciton-polaritons propagate in a fluid of free electrons [46,47]. The Bose polaron problem, i.e.…”

Section: Introductionmentioning

confidence: 99%

Bose polaron in a quantum fluid of light

2022

View full text Add to dashboard Cite

We study the Bose polaron problem in a nonequilibrium setting, by considering an impurity embedded in a quantum fluid of light realized by exciton-polaritons in a microcavity, subject to a coherent drive and dissipation on account of pump and cavity losses. We obtain the polaron effective mass, the drag force acting on the impurity, and determine polaron trajectories at a semiclassical level. We find different dynamical regimes, originating from the unique features of the excitation spectrum of driven-dissipative polariton fluids, in particular a non-trivial regime of acceleration against the flow. Our work promotes the study of impurity dynamics as an alternative testbed for probing superfluidity in quantum fluids of light.

show abstract

Attractive and Repulsive Exciton-Polariton Interactions Mediated by an Electron Gas

Cited by 25 publications

References 50 publications

Polaritons in an Electron Gas—Quasiparticles and Landau Effective Interactions

Polaritons in an Electron Gas—Quasiparticles and Landau Effective Interactions

Polaritons in an electron gas -- quasiparticles and Landau effective interactions

Bose polaron in a quantum fluid of light

Contact Info

Product

Resources

About