340 citations · 2.5k across the 53 of their papers we have counts for
22 papers · 1 filter
High resolution nanosecond spectroscopy of even-parity Rydberg excitons in CuO
Joshua P. Rogers, Liam A. P. Gallagher, Danielle Pizzey +6
We present a study of even parity Rydberg exciton states in cuprous oxide using time-resolved second harmonic generation (SHG). Excitonic states with principal quantum number n = 5…
Microwave-optical coupling via Rydberg excitons in cuprous oxide
Liam A. P. Gallagher, Joshua P. Rogers, Jon D. Pritchett +9
We report exciton-mediated coupling between microwave and optical fields in cuprous oxide (CuO) at low temperatures. Rydberg excitonic states with principal quantum number up t…
Dynamics of resonantly excited excitons in MoSe and WS single-layers monitored with four-wave mixing
Tomasz Jakubczyk, Miroslav Bartos, Karol Nogajewski +4
We investigate dynamics of resonantly excited excitons in single-layers of MoSe and WS down to 4.5 K. To this end, we measure the delay dependence of the heterodyne four-wa…
99% beta factor and directional coupling of quantum dots to fast light in photonic crystal waveguides determined by hyperspectral imaging
L. Scarpelli, B. Lang, F. Masia +8
Spontaneous emission from excitonic transitions in InAs/GaAs quantum dots embedded in photonic crystal waveguides at 5K into non-guided and guided modes is determined by direct hyp…
Coherence and density dynamics of excitons in a single-layer MoS reaching the homogeneous limit
Tomasz Jakubczyk, Goutham Nayak, Lorenzo Scarpelli +13
We measure the coherent nonlinear response of excitons in a single-layer of molybdenum disulphide embedded in hexagonal boron nitride, forming a -BN/MoS/-BN heterostructu…
Long Exciton Dephasing Time and Coherent Phonon Coupling in CsPbBrCl Perovskite Nanocrystals
Michael A. Becker, Lorenzo Scarpelli, Georgian Nedelcu +7
Fully-inorganic cesium lead halide perovskite nanocrystals (NCs) have shown to exhibit outstanding optical properties such as wide spectral tunability, high quantum yield, high osc…
Quantum statistics of polariton parametric interactions
Mathias Sassermann, Zoltán Vörös, Mohsen Razavi +2
Using a high-quality GaAs planar microcavity, we optically generate polariton pairs, and verify their correlations by means of time-resolved single-photon detection. We find that c…
Impact of environment on dynamics of exciton complexes in a WS monolayer
T. Jakubczyk, K. Nogajewski, M. R. Molas +4
Scientific curiosity to uncover original optical properties and functionalities of atomically thin semiconductors, stemming from unusual Coulomb interactions in the two-dimensional…
Geometric frustration in polygons of polariton condensates creating vortices of varying topological charge
Tamsin Cookson, Kirill Kalinin, Helgi Sigurdsson +6
Vorticity is a key ingredient to a broad variety of fluid phenomena, and its quantised version is considered to be the hallmark of superfluidity. Circulating flows that correspond…
Resonantly excited exciton dynamics in two-dimensional MoSe monolayers
L. Scarpelli, F. Masia, E. M. Alexeev +4
We report on the exciton and trion density dynamics in a single layer of MoSe, resonantly excited and probed using three-pulse four-wave mixing (FWM), at temperatures from 300K…
Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: photon echo versus double quantum coherence
Valentin Delmonte, Judith F. Specht, Tomasz Jakubczyk +7
We employ two-dimensional (2D) coherent, nonlinear spectroscopy to investigate couplings within individual InAs quantum dots (QD) and QD molecules. Swapping pulse ordering in a two…
Impact of phonons on dephasing of individual excitons in deterministic quantum dot microlenses
T. Jakubczyk, V. Delmonte, S. Fischbach +12
Optimized light-matter coupling in semiconductor nanostructures is a key to understand their optical properties and can be enabled by advanced fabrication techniques. Using in-situ…
Realizing the Hamiltonian in polariton simulators
Natalia G. Berloff, Kirill Kalinin, Matteo Silva +2
Several platforms are currently being explored for simulating physical systems whose complexity increases faster than polynomially with the number of particles or degrees of freedo…
Radiatively limited dephasing and exciton dynamics in MoSe monolayers
Tomasz Jakubczyk, Valentin Delmonte, Maciej Koperski +5
By implementing four-wave mixing (FWM) micro-spectroscopy we measure coherence and population dynamics of the exciton transitions in monolayers of MoSe. We reveal their dephasi…
Dynamics of excitons in individual InAs quantum dots revealed in four-wave mixing spectroscopy
Q. Mermillod, D. Wigger, V. Delmonte +8
A detailed understanding of the population and coherence dynamics in optically driven individual emitters in solids and their signatures in ultrafast nonlinear-optical signals is o…
Comment on "Normalization of quasinormal modes in leaky optical cavities and plasmonic resonators"
E. A. Muljarov, W. Langbein
Recently, Kristensen, Ge and Hughes have compared [Phys. Rev. A 92, 053810 (2015)] three different methods for normalization of quasinormal modes in open optical systems, and concl…
Resonant-state expansion of dispersive open optical systems
E. A. Muljarov, W. Langbein
A resonant-state expansion (RSE) for open optical systems with a general frequency dispersion of the relative permittivity, described by a finite number of simple poles, is present…
Exact mode volume and Purcell factor of open optical systems
E. A. Muljarov, W. Langbein
The Purcell factor quantifies the change of the radiative decay of a dipole in an electromagnetic environment relative to free space. Designing this factor is at the heart of photo…
Polariton condensation in a planar microcavity with InGaAs quantum wells
Pasquale Cilibrizzi, Alexis Askitopoulos, Matteo Silva +4
Polariton lattice condensates provide a platform for on chip quantum emulations. Interactions in extended polariton lattices are currently limited by the intrinsic photonic disorde…
Evidence of giant oscillator strength in the exciton dephasing of CdSe nanoplatelets measured by resonant four-wave mixing
Ali Naeem, Francesco Masia, Sotirios Christodoulou +3
We measured the intrinsic ground-state exciton dephasing and population dynamics in colloidal quasi two-dimensional (2D) CdSe nanoplatelets at low temperature (5-50K) using transie…
Femtosecond phase-resolved microscopy of plasmon dynamics in individual gold nanospheres
Francesco Masia, Wolfgang Langbein, Paola Borri
The selective optical detection of individual metallic nanoparticles (NPs) with high spatial and temporal resolution is a challenging endeavour, yet is key to the understanding of…
Spin--flip Limited Exciton Dephasing in CdSe/ZnS Colloidal Quantum Dots
Francesco Masia, Nicolò Accanto, Wolfgang Langbein +1
The dephasing time of the lowest bright exciton in CdSe/ZnS wurtzite quantum dots is measured from 5 K to 170 K and compared with density dynamics within the exciton fine structure…