2.1k citations · 4.5k across the 25 of their papers we have counts for
22 papers · 1 filter
Valley-magnetophonon resonance for interlayer excitons
D. S. Smirnov, J. Holler, M. Kempf +8
Heterobilayers consisting of MoSe and WSe monolayers can host optically bright interlayer excitons with intriguing properties such as ultralong lifetimes and pronounced cir…
Interlayer exciton valley polarization dynamics in large magnetic fields
Johannes Holler, Malte Selig, Michael Kempf +11
In van der Waals heterostructures (HS) consisting of stacked MoSe and WSe monolayers, optically bright interlayer excitons (ILE) can be observed when the constituent layers…
Spatial extent of the excited exciton states in WS monolayers from diamagnetic shifts
Jonas Zipfel, Johannes Holler, Anatolie A. Mitioglu +9
We experimentally study the radii of excitons in hBN-encapsulated WS2 monolayers by means of magneto-optical reflectance spectroscopy at cryogenic temperatures in magnetic fields u…
Intervalley Scattering of Interlayer Excitons in a MoS/MoSe/MoS Heterostructure in High Magnetic Field
Alessandro Surrente, Lukasz Klopotowski, Nan Zhang +9
Degenerate extrema in the energy dispersion of charge carriers in solids, also referred to as valleys, can be regarded as a binary quantum degree of freedom, which can potentially…
Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
Philipp Nagler, Mariana V. Ballottin, Anatolie A. Mitioglu +8
We investigate the magnetic-field-induced splitting of biexcitons in monolayer WS using polarization-resolved photoluminescence spectroscopy in out-of-plane magnetic fields up…
Revealing the nature of excitons in liquid exfoliated monolayer WS2
Ł. Kłopotowski, C. Backes, A. A. Mitioglu +6
Transition metal dichalcogenides hold promise for applications in novel optoelectronic devices. There is therefore a need for materials that can be obtained in large quantities and…
Electron and hole g-factors and spin dynamics of negatively charged excitons in CdSe/CdS colloidal nanoplatelets with thick shells
Elena V. Shornikova, Louis Biadala, Dmitri R. Yakovlev +13
We address spin properties and spin dynamics of carriers and charged excitons in CdSe/CdS colloidal nanoplatelets with thick shells. Magneto-optical studies are performed by time-r…
Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets
Elena V. Shornikova, Louis Biadala, Dmitri R. Yakovlev +16
We study the band-edge exciton fine structure and in particular its bright-dark splitting in colloidal semiconductor nanocrystals by four different optical methods based on fluores…
Giant Zeeman splitting inducing near-unity valley polarization in van der Waals heterostructures
Philipp Nagler, Mariana V. Ballottin, Anatolie A. Mitioglu +8
Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics of strongly coupled spin and valley degrees of freedom for charge carriers. Whi…
Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure
Philipp Nagler, Gerd Plechinger, Mariana V. Ballottin +8
In heterostructures consisting of different transition-metal dichalcogenide monolayers, a staggered band alignment can occur, leading to rapid charge separation of optically genera…
Dark excitons and the elusive valley polarization in transition metal dichalcogenides
M. Baranowski, A. Surrente, D. K. Maude +7
A rate equation model for the dark and bright excitons kinetics is proposed which explains the wide variation in the observed degree of circular polarization of the PL emission in…
Onset of exciton-exciton annihilation in single layer black phosphorus
A. Surrente, A. A. Mitioglu, K. Galkowski +5
The exciton dynamics in monolayer black phosphorus is investigated over a very wide range of photoexcited exciton densities using time resolved photoluminescence. At low excitation…
Magneto-excitons in large area CVD grown monolayer MoS and MoSe on sapphire
A. A. Mitioglu, K. Galkowski, A. Surrente +5
Magneto transmission spectroscopy was employed to study the valley Zeeman effect in large-area monolayer MoS and MoSe. The extracted values of the valley g-factors for…
Excitons in atomically thin black phosphorus
A. Surrente, A. A. Mitioglu, K. Galkowski +3
Raman scattering and photoluminescence spectroscopy are used to investigate the optical properties of single layer black phosphorus obtained by mechanical exfoliation of bulk cryst…
Determination of the exciton binding energy and effective masses for the methylammonium and formamidinium lead tri-halide perovskite family
Krzysztof Galkowski, Anatolie Mitioglu, Atsuhiko Miyata +8
The family of organic-inorganic halide perovskite materials has generated tremendous interest in the field of photovoltaics due to their high power conversion efficiencies. There h…
Intervalley scattering of excitons and trions in monolayer WSe under strong excitation
A. A. Mitioglu, L. Klopotowski, D. K. Maude +4
Monolayer transition metal dichalcogenides offer the possibility of optical control of the valley degree of freedom. In order to asses the potential of these materials in applicati…
Optical investigation of monolayer and bulk tungsten diselenide (WSe) in high magnetic fields
A. A. Mitioglu, P. Plochocka, Á. Granados del Aguila +5
Optical spectroscopy in high magnetic fields T is used to reveal the very different nature of carriers in monolayer and bulk transition metal dichalcogenides. In monolaye…
Direct Measurement of the Exciton Binding Energy and Effective Masses for Charge carriers in an Organic-Inorganic Tri-halide Perovskite
Atsuhiko Miyata, Anatolie Mitioglu, Paulina Plochocka +5
Solar cells based on the organic-inorganic tri-halide perovskite family of materials have shown remarkable progress recently, offering the prospect of low-cost solar energy from de…
Second order resonant Raman scattering in single layer tungsten disulfide (WS)
A. A. Mitioglu, P. Plochocka, G. Deligeorgis +3
Resonant Raman spectra of single layer WS flakes are presented. A second order Raman peak (2LA) appears under resonant excitation with a separation from the E mode…
Unintentional high density p-type modulation doping of a GaAs/AlAs core-multi-shell nanowire
J. Jadczak, P. Plochocka, A. Mitioglu +8
Achieving significant doping in GaAs/AlAs core/shell nanowires (NWs) is of considerable technological importance but remains a challenge due to the amphoteric behavior of the dopan…
Optical manipulation of the exciton charge state in single layer tungsten disulfide
A. A. Mitioglu, P. Plochocka, J. N. Jadczak +4
Raman scattering and photoluminescence (PL) emission are used to investigate a single layer of tungsten disulfide (WS) obtained by exfoliating n-type bulk crystals. Direct ga…
High magnetic field reveals the nature of excitons in a single GaAs/AlAs core/shell nanowire
P. Plochocka, A. A. Mitioglu, D. K. Maude +5
Magneto-photoluminescence measurements of individual zinc-blende GaAs/AlAs core/shell nanowires are reported. At low temperature a strong emission line at 1.507 eV is observed unde…