132 citations · 932 across the 29 of their papers we have counts for
29 papers
Primordial Stochastic Gravitational Wave Backgrounds from a Sharp Feature in Three-field Inflation I: The Radiation Era
Vikas Aragam, Sonia Paban, Robert Rosati
The detection of a primordial stochastic gravitational wave background has the potential to reveal unprecedented insights into the early universe, and possibly into the dynamics of…
Interface engineering of charge-transfer excitons in 2D lateral heterostructures
Roberto Rosati, Ioannis Paradisanos, Libai Huang +9
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 ex…
(Slow-)Twisting inflationary attractors
Perseas Christodoulidis, Robert Rosati
We explore in detail the dynamics of multi-field inflationary models. We first revisit the two-field case and rederive the coordinate independent expression for the attractor solut…
Exciton optics, dynamics and transport in atomically thin semiconductors
Raul Perea-Causin, Daniel Erkensten, Jamie M. Fitzgerald +4
Atomically thin semiconductors such as transition metal dichalcogenide (TMD) monolayers exhibit a very strong Coulomb interaction, giving rise to a rich exciton landscape. This mak…
Signatures of dark excitons in exciton-polariton optics of transition metal dichalcogenides
Beatriz Ferreira, Roberto Rosati, Jamie M. Fitzgerald +1
Integrating 2D materials into high-quality optical microcavities opens the door to fascinating many-particle phenomena including the formation of exciton-polaritons. These are hybr…
Microscopic modelling of exciton-polariton diffusion coefficients in atomically thin semiconductors
Beatriz Ferreira, Roberto Rosati, Ermin Malic
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.…
Rapid-turn inflation in supergravity is rare and tachyonic
Vikas Aragam, Roberta Chiovoloni, Sonia Paban +2
Strongly non-geodesic, or rapidly turning trajectories in multifield inflation have attracted much interest recently from both theoretical and phenomenological perspectives. Most m…
Electron dynamics in a 2D nanobubble: A two-level system based on spatial density
Roberto Rosati, Frank Lengers, Christian Carmesin +5
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 th…
Nonclassical Exciton Diffusion in Monolayer WSe2
Koloman Wagner, Jonas Zipfel, Roberto Rosati +9
We experimentally demonstrate time-resolved exciton propagation in a monolayer semiconductor at cryogenic temperatures. Monitoring phonon-assisted recombination of dark states, we…
Non-equilibrium diffusion of dark excitons in atomically thin semiconductors
Roberto Rosati, Koloman Wagner, Samuel Brem +7
Atomically thin semiconductors provide an excellent platform to study intriguing many-particle physics of tightly-bound excitons. In particular, the properties of tungsten-based tr…
The Multi-Field, Rapid-Turn Inflationary Solution
Vikas Aragam, Sonia Paban, Robert Rosati
There are well-known criteria on the potential and field-space geometry for determining if slow-roll, slow-turn, multi-field inflation is possible. However, even though it has been…
Strain-dependent exciton diffusion in transition metal dichalcogenides
Roberto Rosati, Samuel Brem, Raül Perea-Causín +5
Monolayers of transition metal dichalcogenides (TMDs) have a remarkable excitonic landscape with deeply bound bright and dark exciton states. Their properties are strongly affected…
Temporal evolution of low-temperature phonon sidebands in WSe monolayers
Roberto Rosati, Samuel Brem, Raül Perea-Causín +9
Low-temperature photoluminescence (PL) of hBN-encapsulated monolayer tungsten diselenide (WSe) shows a multitude of sharp emission peaks below the bright exciton. Some of them…
Exciton diffusion in monolayer semiconductors with suppressed disorder
Jonas Zipfel, Marvin Kulig, Raül Perea-Causín +8
Tightly bound excitons in monolayer semiconductors represent a versatile platform to study two-dimensional propagation of neutral quasiparticles. Their intrinsic properties, howeve…
Negative excitonic diffusion in transition metal dichalcogenides
Roberto Rosati, Raül Perea-Causín, Samuel Brem +1
While exciton relaxation in transition metal dichalcogenides (TMDs) has been intensively studied, spatial exciton propagation has received only little attention - in spite of being…
Many-field Inflation: Universality or Prior Dependence?
Perseas Christodoulidis, Diederik Roest, Robert Rosati
We investigate the observational signatures of many-field inflation and present analytic expressions for the spectral index as a function of the prior. For a given prior we employ…
Exciton propagation and halo formation in two-dimensional materials
Raul Perea-Causin, Samuel Brem, Roberto Rosati +6
The interplay of optics, dynamics and transport is crucial for the design of novel optoelectronic devices, such as photodetectors and solar cells. In this context, transition metal…
Multi-field Inflation in High-Slope Potentials
Vikas Aragam, Sonia Paban, Robert Rosati
We present two families of multi-field potentials that support inflation while satisfying the refined de Sitter and the distance swampland conjectures. Both families feature Planck…
Spatiotemporal dynamics of Coulomb-correlated carriers in semiconductors
F. Lengers, R. Rosati, T. Kuhn +1
When the excitation of carriers in real space is focused down to the nanometer scale, the carrier system can no longer be viewed as homogeneous and ultrafast transport of the excit…
Inflation in Multi-field Modified DBM Potentials
Sonia Paban, Robert Rosati
We study multi-field inflation in random potentials generated via a non-equilibrium random matrix theory process. We make a novel modification of the process to include correlation…
Spatial control of carrier capture in two-dimensional materials: Beyond energy selection rules
Roberto Rosati, Frank Lengers, Doris E. Reiter +1
Transition metal dichalcogenide monolayers have attracted wide attention due to their remarkable optical, electronic and mechanical properties. In these materials local strain dist…
Lindblad approach to spatio-temporal quantum dynamics of phonon-induced carrier capture processes
Roberto Rosati, Doris E. Reiter, Tilmann Kuhn
In view of the ultrashort spatial and temporal scales involved, carrier capture processes in nanostructures are genuine quantum phenomena. To describe such processes, methods with…
Instability Mechanism for STT-MRAM switching
P. B. Visscher, Kamaram Munira, Robert J. Rosati
To optimize the design of STT-MRAM (spin-transfer torque magnetic random access memory), it is necessary to be able to predict switching (error) rates. For small elements, this can…
Electron-phonon coupling in metallic carbon nanotubes: Dispersionless electron propagation despite dissipation
R. Rosati, F. Dolcini, F. Rossi
A recent study [Rosati, Dolcini, and Rossi, Appl. Phys. Lett. 106, 243101 (2015)] has predicted that, while in semiconducting single-walled carbon nanotubes (SWNTs) an electronic w…