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Semináře

Úterý, 06.08.2019 10:00

Prof. Dr. Lu Jiong (Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543; Centre for Advanced 2D Materials, National University of Singapore, Singapore 117546)

2D materials with reduced dimensionality exhibit unprecedented tunability in both their electronic and optical properties due to the high susceptibility to the doping and the change of many-electron effects. Here we demonstrate a tunable quasiparticle band gap and excitonic effects in back-gated 2D material devices. Using low-temperature scanning tunnelling microscopy (LT-STM), we probed gate-tunable correlation and excitonic effects of recently-emerged 2D materials including few-layer black phosphorus (BP) and monolayer TMDs. The demonstration of field-tunable band gap and excitonic...

Úterý, 10.09.2019 13:00

prof. Massimo Gurioli (Department of Physics and Astronomy, University of Florence, Italy)

The tremendous progress in nanophotonics at the nanoscale has motivated the development of different imaging techniques. Among them scanning near field optical microscopy (SNOM) and, more recently, super-resolution (SR, awarded by 2014 Nobel Prize). I discussed in details the basic differences between SR and SNOM, pointing out their complementary. Then I overviewed our recent SNOM activity for imaging and engineering at the nanoscale, both for semiconductor nanostructures and photonics nano-resonators [1-7].

References
[1] F. Riboli, et al. Nat. Materials 13: 720 (2014) [2] N....

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