Sökning: "quantum rings"

Visar resultat 6 - 7 av 7 uppsatser innehållade orden quantum rings.

1. 6. Electron transport in quantum point contacts : A theoretical study

   Magister-uppsats, Institutionen för datavetenskap, fysik och matematik, DFM

   Författare :Alexander Gustafsson; [2011]
   Nyckelord :quantum point contact; mesoscopic physics; 2DEG; quantized conductance; Aharonov-Bohm; magnetoconductance; recursive Green s function; quantum Hall effect;

   Sammanfattning : Electron transport in mesoscopic systems, such as quantum point contacts and Aharonov-Bohm rings are investigated numerically in a tight-binding language with a recursive Green's function algorithm. The simulation reveals among other things the quantized nature of the conductance in point contacts, the Hall conductance, the decreasing sensitivity to scattering impurities in a magnetic field, and the periodic magnetoconductance in an Aharonov-Bohm ring. LÄS MER

3. 7. Quantum Chemical Investigations of Phenol and Larger Aromatic Molecules on TiO2 Surface

   Uppsats för yrkesexamina på grundnivå, Institutionen för fysik, kemi och biologi

   Författare :Maria Karlsson; [2004]
   Nyckelord :Physical chemistry; Adsorption geometries; Anatase; Band gap; Phenol; Solar cells; TiO2; Fysikalisk kemi;

   Sammanfattning : Adsorption of organic molecules at a surface of titanium dioxide (101) anatase is studied using quantum-chemical density functional theory. Anatase can be used in solar cells. For the clean anatase surface the band gap is so large that only UV-light can excite electrons. LÄS MER