Roberto Rosati
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View article: Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive, and exciton-limited regimes
Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive, and exciton-limited regimes Open
Exciton transport in 2D semiconductors holds promise for room temperature, ultracompact optoelectronic devices, but it is limited by short propagation distances. Hybridization of excitons with cavity photons to form exciton-polaritons can …
View article: Strain Control of Valley Polarization Dynamics in a 2D Semiconductor via Exciton Hybridization
Strain Control of Valley Polarization Dynamics in a 2D Semiconductor via Exciton Hybridization Open
Encoding and manipulating digital information in quantum degrees of freedom is one of the major challenges of today's science and technology. The valley indices of excitons in transition metal dichalcogenides (TMDs) are well-suited to addr…
View article: Tuning relaxation and nonlinear upconversion of valley-exciton-polaritons in a monolayer semiconductor
Tuning relaxation and nonlinear upconversion of valley-exciton-polaritons in a monolayer semiconductor Open
Controlling exciton relaxation and energy conversion pathways via their coupling to photonic modes is a central task in cavity-mediated quantum materials research. In this context, the light-matter hybridization in optical cavities can lea…
View article: Impact of Charge-Transfer Excitons on Unidirectional Exciton Transport in Lateral TMD Heterostructures
Impact of Charge-Transfer Excitons on Unidirectional Exciton Transport in Lateral TMD Heterostructures Open
Lateral heterostructures built of monolayers of transition-metal dichalcogenides host a thin one-dimensional interface exhibiting a large energy offset. Recently, the formation of spatially separated charge-transfer (CT) excitons at the in…
View article: Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive and exciton-limited regimes
Polariton transport in 2D semiconductors: Phonon-mediated transitions between ballistic, superdiffusive and exciton-limited regimes Open
Exciton transport in 2D semiconductors holds promise for room-temperature, ultra-compact optoelectronic devices, but it is limited by short propagation distances. Hybridization of excitons with cavity photons to form exciton-polaritons can…
View article: Infrared Magnetopolaritons in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>MoTe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Monolayers and Bilayers
Infrared Magnetopolaritons in Monolayers and Bilayers Open
MoTe2 monolayers and bilayers are unique within the family of van der Waals materials since they pave the way toward atomically thin infrared light-matter quantum interfaces, potentially reaching the important telecommunication windows. He…
View article: Strain engineering of valley-polarized hybrid excitons in a 2D semiconductor
Strain engineering of valley-polarized hybrid excitons in a 2D semiconductor Open
Encoding and manipulating digital information in quantum degrees of freedom is one of the major challenges of today's science and technology. The valley indices of excitons in transition metal dichalcogenides (TMDs) are well-suited to addr…
View article: Trion Engineered Multimodal Transistors in Two dimensional Bilayer Semiconductor Lateral Heterostructures
Trion Engineered Multimodal Transistors in Two dimensional Bilayer Semiconductor Lateral Heterostructures Open
Multimodal device operations are essential to advancing the integration of 2D semiconductors in electronics, photonics, information and quantum technology. Precise control over carrier dynamics, particularly exciton generation and transpor…
View article: Strain fingerprinting of exciton valley character in 2D semiconductors
Strain fingerprinting of exciton valley character in 2D semiconductors Open
Intervalley excitons with electron and hole wavefunctions residing in different valleys determine the long-range transport and dynamics observed in many semiconductors. However, these excitons with vanishing oscillator strength do not dire…
View article: Circumventing the polariton bottleneck via dark excitons in 2D semiconductors
Circumventing the polariton bottleneck via dark excitons in 2D semiconductors Open
Efficient scattering into the exciton polariton ground state is a key prerequisite for generating Bose–Einstein condensates and low-threshold polariton lasing. However, this can be challenging to achieve at low densities due to the polarit…
View article: Infrared magneto-polaritons in MoTe$_2$ mono- and bilayers
Infrared magneto-polaritons in MoTe$_2$ mono- and bilayers Open
MoTe$_2$ monolayers and bilayers are unique within the family of van-der-Waals materials since they pave the way towards atomically thin infrared light-matter quantum interfaces, potentially reaching the important telecommunication windows…
View article: Two dimensional semiconductors: optical and electronic properties
Two dimensional semiconductors: optical and electronic properties Open
In the last decade atomically thin 2D materials have emerged as a perfect platform for studying and tuning light-matter interaction and electronic properties in nanostructures. The optoelectronic properties in layered materials such as tra…
View article: Revealing dark exciton signatures in polariton spectra of 2D materials
Revealing dark exciton signatures in polariton spectra of 2D materials Open
Dark excitons in transition metal dichalcogenides (TMD) have been so far neglected in the context of polariton physics due to their lack of oscillator strength. However, in tungsten-based TMDs, dark excitons are known to be the energetical…
View article: Circumventing the polariton bottleneck via dark excitons in 2D semiconductors
Circumventing the polariton bottleneck via dark excitons in 2D semiconductors Open
Efficient scattering into the exciton polariton ground state is a key prerequisite for generating Bose-Einstein condensates and low-threshold polariton lasing. However, this can be challenging to achieve at low densities due to the polarit…
View article: Strain fingerprinting of exciton valley character
Strain fingerprinting of exciton valley character Open
Momentum-indirect excitons composed of electrons and holes in different valleys define optoelectronic properties of many semiconductors, but are challenging to detect due to their weak coupling to light. The identification of an excitons' …
View article: Exciton transport in atomically thin semiconductors
Exciton transport in atomically thin semiconductors Open
Atomically thin semiconductors have been in the center of one of the most active research fields. Here, we discuss the main challenges in exciton transport that is crucial for nanoelec- tronics. We focus on transport phenomena in monolayer…
View article: Interface engineering of charge-transfer excitons in 2D lateral heterostructures
Interface engineering of charge-transfer excitons in 2D lateral heterostructures Open
The existence of bound charge transfer (CT) excitons at the interface of monolayer lateral heterojunctions has been debated in literature, but contrary to the case of interlayer excitons in vertical heterostructure their observation still …
View article: Interface engineering of charge-transfer excitons in 2D lateral heterostructures
Interface engineering of charge-transfer excitons in 2D lateral heterostructures Open
The existence of bound charge transfer (CT) excitons at the interface of monolayer lateral heterojunctions has been debated in literature, but contrary to the case of interlayer excitons in vertical heterostructure their observation still …
View article: Signatures of dark excitons in exciton–polariton optics of transition metal dichalcogenides
Signatures of dark excitons in exciton–polariton optics of transition metal dichalcogenides Open
Integrating 2D materials into high-quality optical microcavities opens the door to fascinating many-particle phenomena including the formation of exciton–polaritons. These are hybrid quasi-particles inheriting properties of both the consti…
View article: Exciton optics, dynamics, and transport in atomically thin semiconductors
Exciton optics, dynamics, and transport in atomically thin semiconductors Open
Atomically thin semiconductors such as transition metal dichalcogenide (TMD) monolayers exhibit a very strong Coulomb interaction, giving rise to a rich exciton landscape. This makes these materials highly attractive for efficient and tuna…
View article: Exciton optics, dynamics and transport in atomically thin semiconductors
Exciton optics, dynamics and transport in atomically thin semiconductors Open
Atomically thin semiconductors such as transition metal dichalcogenide (TMD) monolayers exhibit a very strong Coulomb interaction, giving rise to a rich exciton landscape. This makes these materials highly attractive for efficient and tuna…
View article: Signatures of dark excitons in exciton-polariton optics of transition metal dichalcogenides
Signatures of dark excitons in exciton-polariton optics of transition metal dichalcogenides Open
Integrating 2D materials into high-quality optical microcavities opens the door to fascinating many-particle phenomena including the formation of exciton-polaritons. These are hybrid quasi-particles inheriting properties of both the consti…
View article: Microscopic modeling of exciton-polariton diffusion coefficients in atomically thin semiconductors
Microscopic modeling of exciton-polariton diffusion coefficients in atomically thin semiconductors Open
In the strong light-matter coupling regime realized, e.g., by integrating semiconductors into optical microcavities, polaritons as new hybrid light-matter quasiparticles are formed. The corresponding change in the dispersion relation has a…
View article: Microscopic modelling of exciton-polariton diffusion coefficients in atomically thin semiconductors
Microscopic modelling of exciton-polariton diffusion coefficients in atomically thin semiconductors Open
In the strong light-matter coupling regime realized e.g. by integrating semiconductors into optical microcavities, polaritons as new hybrid light-matter quasi-particles are formed. The corresponding change in the dispersion relation has a …
View article: Dark exciton anti-funneling in atomically thin semiconductors
Dark exciton anti-funneling in atomically thin semiconductors Open
Transport of charge carriers is at the heart of current nanoelectronics. In conventional materials, electronic transport can be controlled by applying electric fields. Atomically thin semiconductors, however, are governed by excitons, whic…
View article: Electron dynamics in a 2D nanobubble: A two-level system based on spatial density
Electron dynamics in a 2D nanobubble: A two-level system based on spatial density Open
Nanobubbles formed in monolayers of transition metal dichalcogenides (TMDCs) on top of a substrate feature localized potentials, in which electrons can be captured. We show that the captured electronic density can exhibit a non-trivial spa…
View article: Non-equilibrium diffusion of dark excitons in atomically thin semiconductors
Non-equilibrium diffusion of dark excitons in atomically thin semiconductors Open
Combining microscopic theory and spatiotemporal photoluminescence experiments we reveal an unconventional, time-dependent exciton diffusion in atomically thin semiconductors. This behavior originates from hot dark excitons with large exces…