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Disclosing Early Excited State Relaxation Events in Prototypical Linear Carbon Chains
Piotr Kabaciński, Pietro Marabotti, Patrick Serafini +4
One-dimensional (1D) linear nanostructures comprising sp-hybridized carbon atoms, as derivatives of the prototypical allotrope known as carbyne, are predicted to possess outstandin…
Strong Coupling of Coherent Phonons to Excitons in Semiconducting Monolayer MoTe
Charles J. Sayers, Armando Genco, Chiara Trovatello +8
The coupling of the electron system to lattice vibrations and their time-dependent control and detection provides unique insight into the non-equilibrium physics of semiconductors.…
Nonlinear interactions of dipolar excitons and polaritons in MoS2 bilayers
Charalambos Louca, Armando Genco, Salvatore Chiavazzo +12
Nonlinear interactions between excitons strongly coupled to light are key for accessing quantum many-body phenomena in polariton systems. Atomically-thin two-dimensional semiconduc…
Hot-Carrier Cooling in High-Quality Graphene is Intrinsically Limited by Optical Phonons
Eva A. A. Pogna, Xiaoyu Jia, Alessandro Principi +20
Many promising optoelectronic devices, such as broadband photodetectors, nonlinear frequency converters, and building blocks for data communication systems, exploit photoexcited ch…
Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene
Eva A. A. Pogna, Xianchong Miao, Driele von Dreifus +7
Van der Waals heterostructures obtained by artificially stacking two-dimensional crystals represent the frontier of material engineering, demonstrating properties superior to those…
Exciton-phonon coupling strength in single-layer MoSe2 at room temperature
Donghai Li, Chiara Trovatello, Stefano Dal Conte +6
Single-layer transition metal dichalcogenides are at the center of an ever increasing research effort both in terms of fundamental physics and applications. Exciton-phonon coupling…
Non-equilibrium Band Broadening, Gap Renormalization and Band Inversion in Black Phosphorus
H. Hedayat, A. Ceraso, G. Soavi +6
Black phosphorous (BP) is a layered semiconductor with high carrier mobility, anisotropic optical response and wide bandgap tunability. In view of its application in optoelectronic…
Photocatalytic activity of exfoliated graphite-TiO nanocomposites
Gloria Guidetti, Eva A. A. Pogna, Lucia Lombardi +16
We investigate the photocatalytic performance of nanocomposites prepared in a one-step process by liquid-phase exfoliation of graphite in the presence of TiO nanoparticles (NPs…
Hot electrons modulation of third harmonic generation in graphene
G. Soavi, G. Wang, H. Rostami +8
Hot electrons dominate the ultrafast (fs-ps) optical and electronic properties of metals and semiconductors and they are exploited in a variety of applications including phot…
Coherent anti-Stokes Raman Spectroscopy of single and multi-layer graphene
A. Virga, C. Ferrante, G. Batignani +5
We report stimulated Raman spectroscopy of the G phonon in both single and multi-layer graphene, through Coherent anti-Stokes Raman Scattering (CARS). The signal generated by the t…
Broadband, electrically tuneable, third harmonic generation in graphene
G. Soavi, G. Wang, H. Rostami +16
Optical harmonic generation occurs when high intensity light (W/m) interacts with a nonlinear material. Electrical control of the nonlinear optical response enables…
Raman spectroscopy of graphene under ultrafast laser excitation
C. Ferrante, A. Virga, L. Benfatto +11
The equilibrium optical phonons of graphene are well characterized in terms of anharmonicity and electron-phonon interactions, however their non-equilibrium properties in the prese…
Out-of-plane heat transfer in van der Waals stacks: electron-hyperbolic phonon coupling
K. J. Tielrooij, N. C. H. Hesp, A. Principi +20
Van der Waals heterostructures have emerged as promising building blocks that offer access to new physics, novel device functionalities, and superior electrical and optoelectronic…
Macrospin Dynamics in Antiferromagnets Triggered by Sub-20 femtosecond Injection of Nanomagnons
D. Bossini, S. Dal Conte, Y. Hashimoto +5
The understanding of how the sub-nanoscale exchange interaction evolves in macroscale correlations and ordered phases of matter, such as magnetism and superconductivity, requires t…
Mode-matching in multiresonant plasmonic nanoantennas for enhanced second harmonic generation
Michele Celebrano, Xiaofei Wu, Milena Baselli +10
Boosting nonlinear frequency conversion in extremely confined volumes remains a key challenge in nano-optics, nanomedicine, photocatalysis, and background-free biosensing. To this…
High energetic excitons in carbon nanotubes directly probe charge-carriers
Giancarlo Soavi, Francesco Scotognella, Daniele Viola +4
Theory predicts peculiar features for excited-state dynamics in one dimension (1D) that are difficult to be observed experimentally. Single-walled carbon nanotubes (SWNTs) are an e…
Non-equilibrium dynamics of photo-excited electrons in graphene: collinear scattering, Auger processes, and the impact of screening
Andrea Tomadin, Daniele Brida, Giulio Cerullo +2
We present a combined analytical and numerical study of the early stages (sub-100fs) of the non-equilibrium dynamics of photo-excited electrons in graphene. We employ the semiclass…
Ultrafast collinear scattering and carrier multiplication in graphene
D. Brida, A. Tomadin, C. Manzoni +8
Graphene is emerging as a viable alternative to conventional optoelectronic, plasmonic, and nanophotonic materials. The interaction of light with carriers creates an out-of-equilib…