Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature

Tiene, Antonio; Mulkerin, Brendan C.; Levinsen, Jesper; Parish, Meera M.; Marchetti, Francesca Maria

doi:10.1103/physrevb.108.125406

Phys. Rev. B

2023

DOI: 10.1103/physrevb.108.125406

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Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature

Antonio Tiene,

Brendan C. Mulkerin,

Jesper Levinsen

et al.

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Cited by 5 publications

(1 citation statement)

References 90 publications

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“…The sharp resonance of AP coincides with the intrinsic broadening of excitons due to the bound nature. In contrast, the RP consists of a continuum of eigenstates with closely spaced eigenvalues, resulting in a broadened linewidth at higher doping levels. , …”

mentioning

confidence: 99%

Interlayer Fermi Polarons of Excited Exciton States in Quantizing Magnetic Fields

Cui,

Hu,

Zhao

et al. 2024

Nano Lett.

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The study of exciton polarons has offered profound insights into the many-body interactions between bosonic excitations and their immersed Fermi sea within layered heterostructures. However, little is known about the properties of exciton polarons with interlayer interactions. Here, through magneto-optical reflectance contrast measurements, we experimentally investigate interlayer Fermi polarons for 2s excitons in WSe 2 /graphene heterostructures, where the excited exciton states (2s) in the WSe 2 layer are dressed by free charge carriers of the adjacent graphene layer in the Landau quantization regime. First, such a system enables an optical detection of integer and fractional quantum Hall states (e.g., ν = ±1/3, ±2/3) of monolayer graphene. Furthermore, we observe that the 2s state evolves into two distinct branches, denoted as attractive and repulsive polarons, when graphene is doped out of the incompressible quantum Hall gaps. Our work paves the way for the understanding of the excited composite quasiparticles and Bose−Fermi mixtures.

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mentioning

confidence: 99%

Interlayer Fermi Polarons of Excited Exciton States in Quantizing Magnetic Fields

Cui,

Hu,

Zhao

et al. 2024

Nano Lett.

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Longitudinal-transverse splitting and fine structure of Fermi polarons in two-dimensional semiconductors

Iakovlev,

Glazov

2024

Journal of Luminescence

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Electrically tunable layer-hybridized trions in doped WSe2 bilayers

Perea-Causin,

Brem,

Buchner

et al. 2024

Nat Commun

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Doped van der Waals heterostructures host layer-hybridized trions, i.e. charged excitons with layer-delocalized constituents holding promise for highly controllable optoelectronics. Combining a microscopic theory with photoluminescence (PL) experiments, we demonstrate the electrical tunability of the trion energy landscape in naturally stacked WSe2 bilayers. We show that an out-of-plane electric field modifies the energetic ordering of the lowest lying trion states, which consist of layer-hybridized $$\Lambda$$ Λ -point electrons and layer-localized K-point holes. At small fields, intralayer-like trions yield distinct PL signatures in opposite doping regimes characterized by weak Stark shifts in both cases. Above a doping-asymmetric critical field, interlayer-like species are energetically favored and produce PL peaks with a pronounced Stark red-shift and a counter-intuitively large intensity arising from efficient phonon-assisted recombination. Our work presents an important step forward in the microscopic understanding of layer-hybridized trions in van der Waals heterostructures and paves the way towards optoelectronic applications based on electrically controllable atomically-thin semiconductors.

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Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature

Cited by 5 publications

References 90 publications

Interlayer Fermi Polarons of Excited Exciton States in Quantizing Magnetic Fields

Interlayer Fermi Polarons of Excited Exciton States in Quantizing Magnetic Fields

Longitudinal-transverse splitting and fine structure of Fermi polarons in two-dimensional semiconductors

Electrically tunable layer-hybridized trions in doped WSe2 bilayers

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