256 citations · 1.3k across the 26 of their papers we have counts for
21 papers · 1 filter
Raman scattering excitation in monolayers of semiconducting transition metal dichalcogenides
M. Zinkiewicz, M. Grzeszczyk, T. Kazimierczuk +10
Raman scattering excitation (RSE) is an experimental technique in which the spectrum is made up by sweeping the excitation energy when the detection energy is fixed. We study the l…
Excitons and trions in WSSe monolayers
Katarzyna Olkowska-Pucko, Elena Blundo, Natalia Zawadzka +15
The possibility of almost linear tuning of the band gap and of the electrical and optical properties in monolayers (MLs) of semiconducting transition metal dichalcogenide (S-TMD) a…
Ultrafast valley-selective coherent optical manipulation with excitons in WSe and MoS monolayers
A. O. Slobodeniuk, P. Koutenský, M. Bartoš +4
Increasing the speed limits of conventional electronics requires innovative approaches to manipulate other quantum properties of electrons besides their charge. An alternative appr…
Semiconductor Bloch equation analysis of optical Stark and Bloch-Siegert shifts in monolayers WSe and MoS
A. O. Slobodeniuk, P. Koutenský, M. Bartoš +4
We report on the theoretical and experimental investigation of valley-selective optical Stark and Bloch-Siegert shifts of exciton resonances in monolayers WSe and MoS induc…
Destructive photon echo formation in six-wave mixing signals of a MoSe monolayer
Thilo Hahn, Diana Vaclavkova, Miroslav Bartos +8
Monolayers of transition metal dichalcogenides display a strong excitonic optical response. Additionally encapsulating the monolayer with hexagonal boron nitride allows to reach th…
Rydberg series of dark excitons and the conduction band spin-orbit splitting in monolayer WSe
Piotr Kapuscinski, Alex Delhomme, Diana Vaclavkova +7
Strong Coulomb correlations together with multi-valley electronic bands in the presence of spin-orbit interaction and possible new optoelectronic applications are at the heart of s…
Excitonic complexes in -doped WS monolayer
M. Zinkiewicz, T. Woźniak, T. Kazimierczuk +12
We investigate the origin of emission lines apparent in the low-temperature photoluminescence spectra of -doped WS monolayer embedded in hexagonal BN layers using external m…
Neutral and charged dark excitons in monolayer WS
M. Zinkiewicz, A. O. Slobodeniuk, T. Kazimierczuk +12
Low temperature and polarization resolved magneto-photoluminescence experiments are used to investigate the properties of dark excitons and dark trions in a monolayer of WS enc…
Valley polarization of singlet and triplet trions in WS monolayer in magnetic fields
P. Kapuściński, D. Vaclavkova, M. Grzeszczyk +9
The spectral signatures associated with different negatively charged exciton complexes (trions) in a WS monolayer encapsulated in hBN, are analyzed from low temperature and pol…
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…
The effect of metallic substrates on the optical properties of monolayer MoSe
M. Grzeszczyk, M. R. Molas, K. Nogajewski +6
Atomically thin materials, like semiconducting transition metal dichalcogenides (S-TMDs), are highly sensitive to the environment. This opens up an opportunity to externally contro…
Breathing modes in few-layer MoTe activated by h-BN encapsulation
M. Grzeszczyk, M. R. Molas, M. Bartoš +3
The encapsulation of few-layer transition metal dichalcogenides (TMDs) in hexagonal boron nitride (h-BN) is known to improve significantly their optical and electronic properties.…
Energy spectrum of two-dimensional excitons in a non-uniform dielectric medium
M. R. Molas, A. O. Slobodeniuk, K. Nogajewski +7
We demonstrate that, in monolayers (MLs) of semiconducting transition metal dichalcogenides, the -type Rydberg series of excitonic states follows a simple energy ladder: $ε_n=-R…
Probing and manipulating valley coherence of dark excitons in monolayer WSe
M. R. Molas, A. O. Slobodeniuk, T. Kazimierczuk +10
Monolayers of semiconducting transition metal dichalcogenides are two-dimensional direct-gap systems which host tightly-bound excitons with an internal degree of freedom correspond…
Fine structure of -excitons in multilayers of transition metal dichalcogenides
A. O. Slobodeniuk, Ł. Bala, M. Koperski +8
Reflectance and magneto-reflectance experiments together with theoretical modelling based on the approach have been employed to study the evolution of direct ba…
Tuning carrier concentration in a superacid treated MoS monolayer
Maciej R. Molas, Katarzyna Gołasa, Łukasz Bala +4
The effect of bis(trifluoromethane) sulfonimide (TFSI, superacid) treatment on the optical properties of MoS monolayers is investigated by means of photoluminescence, reflectan…
Orbital, spin and valley contributions to Zeeman splitting of excitonic resonances in MoSe, WSe and WS monolayers
M. Koperski, M. R. Molas, A. Arora +6
We present a comprehensive optical study of the excitonic Zeeman effects in transition metal dichalcogenide monolayers, which are discussed comparatively for selected materials: Mo…
Singlet and triplet trions in WS monolayer encapsulated in hexagonal boron nitride
D. Vaclavkova, J. Wyzula, K. Nogajewski +5
Embedding a WS monolayer in flakes of hexagonal boron nitride allowed us to resolve and study the photoluminescence response due to both singlet and triplet states of negativel…
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…
Optical response of monolayer, few-layer and bulk tungsten disulfide
Maciej R. Molas, Karol Nogajewski, Artur O. Slobodeniuk +3
We present a comprehensive optical study of thin films of tungsten disulfide (WS) with layer thicknesses ranging from mono- to octalayer and in the bulk limit. It is shown that…
Brightening of dark excitons in monolayers of semiconducting transition metal dichalcogenides
M. R. Molas, C. Faugeras, A. O. Slobodeniuk +4
We present low temperature magneto-photoluminescence experiments which demonstrate the brightening of dark excitons by an in-plane magnetic field applied to monolayers of diffe…