Publications de Anna Maria Roslawska

Gigahertz Frame Rate Imaging of Charge-Injection Dynamics in a Molecular Light Source

Klaus Kern, Markus Etzkorn, Anna Maria Roslawska, Abhishek Grewal

Light sources on the scale of single molecules can be addressed and characterized at their proper sub-nanometer scale by scanning tunneling microscopy-induced luminescence (STML). Such a source can be driven by defined short charge pulses while the lumines ...

AMER CHEMICAL SOC2021

Atomic-Scale Structural Fluctuations of a Plasmonic Cavity

Klaus Kern, Anna Maria Roslawska, Abhishek Grewal

Optical spectromicroscopies, which can reach atomic resolution due to plasmonic enhancement, are perturbed by spontaneous intensity modifications. Here, we study such fluctuations in plasmonic electroluminescence at the single-atom limit profiting from the ...

AMER CHEMICAL SOC2021

Gold Chain Formation via Local Lifting of Surface Reconstruction by Hot Electron Injection on H-2(D-2)/Au(111)

Klaus Kern, Anna Maria Roslawska, Abhishek Grewal

The hexagonal close packed surface of gold shows a 22 x root 3 "herringbone" surface reconstruction which makes it unique among the (111) surfaces of all metals. This long-range energetically favored dislocation pattern appears in response to the strong te ...

AMER CHEMICAL SOC2020

A Single Hydrogen Molecule as an Intensity Chopper in an Electrically Driven Plasmonic Nanocavity

Klaus Kern, Christoph Grosse, Anna Maria Roslawska, Abhishek Grewal

Photon statistics is a powerful tool for characterizing the emission dynamics of nanoscopic systems and their photophysics. Recent advances that combine correlation spectroscopy with scanning tunneling microscopy induced luminescence (STML) have allowed th ...

AMER CHEMICAL SOC2019

Dynamics of nanoscale systems probed by time-resolved STM-induced luminescence

Anna Maria Roslawska

The efficiency and peculiarities of processes such as surface adsorption or electron-to-photon energy conversion in organic and inorganic structures are determined by the dynamics at the scale of individual molecules, atoms and charges. The timescales of s ...

EPFL2019

Bimodal exciton-plasmon light sources controlled by local charge carrier injection

Klaus Kern, Christoph Grosse, Anna Maria Roslawska

Electrical charges can generate photon emission in nanoscale quantum systems by two independent mechanisms. First, radiative recombination of pairs of oppositely charged carriers generates sharp excitonic lines. Second, coupling between currents and collec ...

AMER ASSOC ADVANCEMENT SCIENCE2018

Single Charge and Exciton Dynamics Probed by Molecular-Scale-Induced Electroluminescence

Klaus Kern, Markus Etzkorn, Christoph Grosse, Anna Maria Roslawska

American Chemical Society (ACS)2018

Exciton dynamics of C-60-based single-photon emitters explored by Hanbury Brown-Twiss scanning tunnelling microscopy

Klaus Kern, Christoph Grosse, Anna Maria Roslawska

Exciton creation and annihilation by charges are crucial processes for technologies relying on charge-exciton-photon conversion. Improvement of organic light sources or dye-sensitized solar cells requires methods to address exciton dynamics at the molecula ...

Nature Publishing Group2015