Stacking order dependence of interlayer excitons in MoSe2/WSe2 heterobilayers DOI
J. Lou, Zheng Lv, Haochen Wang

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(4)

Published: July 8, 2024

Two-dimensional transition metal dichalcogenide heterostructures provide a unique opportunity for quantum engineering of electronic and excitonic states at the nanoscale. Critical optical properties interlayer excitons, including energy, selectivity, yield, are strongly correlated to stacking orders. However, these could vary from sample sample, setting an obstacle extracting intrinsic order dependence experimentally. We report effective method fabricate heterobilayers with both orders obtained on single device. The sharp difference excitons induced by was unambiguously identified, emission wavelength, valley polarization, temperature yield. This provides flexible platform study heterobilayer can be readily applied explore layer hybridization, strong correlations, exciton diffusion that sensitive order.

Language: Английский

Observation of transient trion induced by ultrafast charge transfer in graphene/MoS2 heterostructure DOI
Chen Wang, Y. F. Chen,

Qiushi Ma

et al.

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(4)

Published: Jan. 27, 2025

Van der Waals (vdW) heterostructures constructed from transition metal dichalcogenidess provide an ideal platform for exploring various quasiparticle behaviors, with trion—composed of neutral exciton and charged carrier—being a notable example. There are typically three methods to generate trion: electrical doping, chemical direct optical doping. The first two static trion, while the last gives rise transient trion. Here, we present indirect doping approach trion via ultrafast charge transfer (CT) achieve control over trion-to-exciton ratio by adjusting CT in Gr/MoS2 heterostructure. Furthermore, demonstrated that dynamics generated this method, which shows slightly longer lifetime than accounted Coulomb interactions between defect. This study provides fresh perspectives on construction desired quasiparticles, dynamical characterization, many-body interaction two-dimensional structure.

Language: Английский

Citations

1
Strain fingerprinting of exciton valley character in 2D semiconductors DOI Creative Commons
Abhijeet Kumar, Denis Yagodkin, Roberto Rosati

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 30, 2024

Intervalley excitons with electron and hole wavefunctions residing in different valleys determine the long-range transport dynamics observed many semiconductors. However, these vanishing oscillator strength do not directly couple to light and, hence, remain largely unstudied. Here, we develop a simple nanomechanical technique control energy hierarchy of via their contrasting response mechanical strain. We use our discover previously inaccessible intervalley associated K, Γ, or Q prototypical 2D semiconductors WSe

Language: Английский

Citations

6
Beyond the K-valley: exploring unique trion states in indirect band gap monolayer WSe2 DOI Creative Commons
Carl Emil Mørch Nielsen,

Franz Fischer,

Gabriel Bester

et al.

npj 2D Materials and Applications, Journal Year: 2025, Volume and Issue: 9(1)

Published: Feb. 8, 2025

Language: Английский

Citations

0
Theory of biexciton polaritons in transition metal dichalcogenide monolayers DOI
A. Kudlis, I. A. Aleksandrov, M. M. Glazov

et al.

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(11)

Published: March 3, 2025

Language: Английский

Citations

0
Probing excitons with time-resolved momentum microscopy DOI Creative Commons
Marcel Reutzel, G. S. Matthijs Jansen, Stefan Mathias

et al.

Advances in Physics X, Journal Year: 2024, Volume and Issue: 9(1)

Published: July 26, 2024

Excitons – two-particle correlated electron-hole pairs are the dominant low-energy optical excitation in broad class of semiconductor materials, which range from classical silicon to perovskites, and two-dimensional organic materials. The study excitons has been brought on a new level detail by application photoemission momentum microscopy technique that dramatically extended capabilities time- angle resolved spectroscopy. Here, we review how photoelectron detection scheme enables direct access energy landscape bright dark excitons, and, more generally, momentum-coordinate exciton wavefunction. Focusing materials semiconductors, first discuss typical fingerprint highlight it is possible obtain information not only electron- but also hole-component. Second, focus recent orbital tomography such this provides unique real-space properties We studies performed transition metal dichalcogenides semiconductors lead very similar conclusions, manner, strength for excitations semiconductors.

Language: Английский

Citations

3
Ultrafast switching of trions in 2D materials by terahertz photons DOI
Tommaso Venanzi,

Marzia Cuccu,

Raül Perea‐Causín

et al.

Nature Photonics, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 23, 2024

Language: Английский

Citations

3
Electrically tunable layer-hybridized trions in doped WSe2 bilayers DOI Creative Commons
Raül Perea‐Causín, Samuel Brem,

Fabian Buchner

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 7, 2024

Abstract 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 photoluminescence (PL) experiments, we demonstrate the electrical tunability of trion energy landscape in naturally stacked WSe 2 bilayers. We show that an out-of-plane electric field modifies energetic ordering lowest lying states, which consist $$\Lambda$$ Λ -point electrons and layer-localized K-point holes. At small fields, intralayer-like trions yield distinct PL signatures opposite doping regimes characterized by weak Stark shifts both cases. Above doping-asymmetric critical field, interlayer-like species are energetically favored produce peaks pronounced red-shift counter-intuitively large intensity arising from efficient phonon-assisted recombination. Our work presents important step forward understanding paves way towards optoelectronic applications based on electrically atomically-thin semiconductors.

Language: Английский

Citations

0
Stacking order dependence of interlayer excitons in MoSe2/WSe2 heterobilayers DOI
J. Lou, Zheng Lv, Haochen Wang

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(4)

Published: July 8, 2024

Two-dimensional transition metal dichalcogenide heterostructures provide a unique opportunity for quantum engineering of electronic and excitonic states at the nanoscale. Critical optical properties interlayer excitons, including energy, selectivity, yield, are strongly correlated to stacking orders. However, these could vary from sample sample, setting an obstacle extracting intrinsic order dependence experimentally. We report effective method fabricate heterobilayers with both orders obtained on single device. The sharp difference excitons induced by was unambiguously identified, emission wavelength, valley polarization, temperature yield. This provides flexible platform study heterobilayer can be readily applied explore layer hybridization, strong correlations, exciton diffusion that sensitive order.

Language: Английский

Citations

0