Article by HSE Professor in 'Nature: Quantum Materials' Journal
The article 'Quantum size phenomena in single-crystalline bismuth nanostructures' by Konstantin Arutyunov, Professor at MIEM School of Electronic Engineering, and Egor Sedov, 2nd-year master's student, was published in 'Nature: Quantum Materials' Journal.
Size-dependent quantization of energy spectrum of conducting electrons in solids leads to oscillating dependence of electronic properties on corresponding dimension(s). In conventional metals with typical energy Fermi E F ~ 1 eV and the charge carrier's effective masses m * of the order of free electron mass m 0 , the quantum size phenomena provide noticeable impact only at nanometer scales. Here we experimentally demonstrate that in single-crystalline semimetal bismuth nanostructures the electronic conductivity non-monotonously decreases with reduction of the effective diameter. In samples grown along the particular crystallographic orientation the electronic conductivity abruptly increases at scales of about 50 nm due to metal-to-insulator transition mediated by the quantum confinement effect. The experimental findings are in reasonable agreement with theory predictions. The quantum-size phenomena should be taken into consideration to optimize operation of the next generation of ultra-small quantum nanoelectronic circuits.