About us
The main research directions of the Laboratory of Ultrafast MagnetoSpectroscopy (LUMS) are optical studies of semiconductor nanostructures such as quantum dots, nanowires, quantum wells and layered materials (graphene, WSe2, MoSe2, etc.). Other important research topics are also microcavity polaritons and II-VI quantum dots containing single magnetic ions such as manganese and iron. Spatial resolution below 1 µm allows studies of single nanostructures. The experiments are carried out at low temperatures (down to 1.5 K), in a magnetic field of up to 11 T using laser pulses lasting several dozen femto- or picoseconds. Ultrafast light detectors such as streak cameras or avalanche photodiodes allow studying the processes with a characteristic time scale of the order of single picoseconds.
The equipment of the LUMS includes a device for the Molecular Beam Epitaxy. A Focused Ion Beam apparatus is used for micro-structuring of produced samples.
Recently most important achievements of LUMS include the development of a method for epitaxial production of ultrathin layers of transition metal dichalkogenides (Pacuski et al., Nano Letters 2020), observation of three thresholds in the emission of a polaritonic optical microcavity (Sawicki et al., Communications Physics 2019) or control of emission polarization of WSe2 monolayers by applying a weak magnetic field (Smoleński et al., Physical Review X, 2018).
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