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Artykuł poświęcony jest pamięci zmarłego niedawno prof. Roberta Gałązki, którego wielkim osiągnięciem naukowym były badania nad półprzewodnikami półmagnetycznymi, tj. materiałami z pogranicza dwóch bardzo od siebie różnych dziedzin – magnetyzmu i fizyki półprzewodników, co na ogół prowadzi do pojawienia się zupełnie nowych i nieoczekiwanych zjawisk. Omówię tu, w jaki sposób namagnesowanie tych materiałów...
Intense THz excitation in topological insulator Bi2Se3 induces negative low-frequency conductivity and energy-dependent relaxation dynamics, different from high-energy pumping, which allows us to isolate intrinsic quasi-particle scattering dynamics inside the surface states.
Tin selenide thin films have been grown by molecular beam epitaxy on GaAs (111)B substrates at a growth temperature of 150°C, and a microstructural study has been carried out, primarily using the technique of transmission electron microscopy. The Se:Sn flux ratio during growth was systematically varied and found to have a strong impact on the resultant crystal structure and quality. Low flux ratios...
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