By Thomas Ihn
This booklet treats 3 issues of digital quantum shipping in mesoscopic semiconductor buildings: the conductance in strongly interacting and disordered two-dimensional structures and the steel insulator transition, electron shipping via quantum dots and quantum earrings within the Coulomb-blockade regime, and scanning probe experiments on semiconductor nanostructures at cryogenic temperatures. moreover it provides a short ancient account of electron shipping from Ohm's legislation via delivery in semiconductor nanostructures, and a assessment of cryogenic scanning probe options utilized to semiconductor nanostructures. either graduate scholars and researchers within the box of mesoscopic semiconductors or in semiconductor nanostructures will locate this booklet important.
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Additional resources for Electronic Quantum Transport in Mesoscopic Semiconductor Structures (Springer Tracts in Modern Physics)
Example text
Investigations in a perpendicular magnetic field aimed at weak localization effects. Experiments in parallel and tilted magnetic fields gave indications that the metallic behavior disappears as soon as the system becomes spin-porlarized. Compressibility studies are the only experiments probing a thermodynamic property in these systems. The characteristic experimental feature of what has been called the metal– insulator transition in two-dimensional systems is the change in the slope from d xx /dT > 0 (metallic behavior) at high carrier density to d xx /dT < 0 (insulating behavior) at low carrier density.
7) for deformation potential scattering with weak (resp. strong) screening and α = 3 (resp. 5) for piezoelectric coupling, again with weak (resp. strong) screening. The Tl -dependent terms in the above equation can be regarded as being constant in the experiment. In the double-logarithmic plot they are responsible for the strong increase of the dissipated power at the lowest electron temperatures. They can be eliminated by adding an offset P0 (Tl ) to PE , which is theoretically given by c1 Tlα + c2 Tlα but experimentally found by the condition that resulting curves for different Tl must collapse onto a single curve.
In chapter 3 to 7 we introduce the well-established theoretical concepts based on Fermi-liquid theory and beyond. In chapters 8 and 9 an overview is given of experiments and theories related to the possible metal–insulator transition in two-dimensions. Chapter 10 will be devoted to experiments performed on p-SiGe quantum wells which exhibit features of the metal–insulator transition, their analysis, and interpretation. This page intentionally left blank 3 The concept of metals and insulators According to the quantum mechanical concept of metals and insulators introduced by Wilson [96, 97], metallic conductivity is expected for systems in which the density of states at the Fermi level remains finite at zero temperature.