1 / 8

Quantum Dots: Artificial Atoms Review by R. C. Ashoori

Explore the world of quantum dots as artificial atoms, where single mobile electrons are contained in small structures. Conduct atomic physics experiments and learn about Single-Electron Capacitance Spectroscopy and Artificial Atom Models.

tobit
Télécharger la présentation

Quantum Dots: Artificial Atoms Review by R. C. Ashoori

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Electrons in artificial atoms Review paper by R. C. Ashoori Nature, VOL 379, 1996 Review by Qin Zhou

  2. Quantum dots—artificial atoms • Quantum dots are so small that they can contain just one mobile electron. • By varying controllably the number of electrons in these ‘artificial atoms’ and measuring the energy required to add successive electrons, one can conduct atomic physics experiments in regime that is inaccessible to experiments on real atoms.

  3. Single-electron capacitance spectroscopy (SECS) • Quantum dot between two capacitor plates • Close to bottom plate to allow tunneling • Realize: • 10nm AlGaAs (insulator) • 10nm GaAs (Quantum well) • Gate (Confine electrons laterly) • Apply voltage on gate to attract electrons

  4. Single-electron capacitance spectroscopy (SECS)

  5. ‘Gated transport spectroscopy’ (GTS) • Similar Principle • About 30 electrons in the dot • Can operate in DC mode

  6. Artificial atom model • n – radial quantum number • l – angular quantum number Highest energy electron may be in a different quantum level depending on the magnetic field, and each of these levels has a different evolution in magnetic field.

  7. Similar experiments • Uri Banin, et al., Nature, VOL 400, 1999

  8. Thank you! The End

More Related