1 / 16

Electronic transport in semiconductor nanostructures

Electronic transport in semiconductor nanostructures. Thomas Ihn ETH Zürich FS 17. After this lecture you know and understand…. … quantum interference in diffusive wires ... why conductance flutuations in diffusive systems have a universal amplitude of e 2 / h

berthapeck
Download Presentation

Electronic transport in semiconductor nanostructures

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. Electronic transport in semiconductor nanostructures Thomas Ihn ETH Zürich FS 17

  2. After this lecture you know and understand… • … quantum interference in diffusive wires • ... why conductance flutuations in diffusive systems have a universal amplitude of e2/h • ... the weak localization phenomenon • ... the qualitative importance of the phase coherence length or time Book: Chapters 14.8, 15.1-5

  3. Landauer-Büttiker theory Low-temperature "Conductance Is Transmission" at the Fermi energy Markus Büttiker (1950- 2013) Rolf Landauer (1927-1999)

  4. Classical vs. Quantum Probabilities quantum interference see Feynman Lectures on Physics III: Quantum mechanics

  5. Altshuler-Aronov-Spivak oscillations in metallic cylinders Magnesium cylinders evaporated on quartz filaments Sharvin and Sharvin, 1981

  6. Aharonov-Bohm oscillations in metal rings Webb et al, PRL 1985 resistance magnetic field

  7. Aharonov-Bohm oscillations in a CNT A. Bachtold et al, Nature 1999 h/e

  8. Oscillatory magnetoresistance in ballistic n-GaAs ring structures A. Fuhrer, 2001

  9. Oscillatory magnetoresistance in ballistic p-GaAs ring structures F. Nichele, 2011 raw data h/e h/2e

  10. Oscillatory magnetoresistance in a Bi2Se3 (topological insulator) nanoribbon H. Peng et al, Nature Mat. 2009

  11. Altshuler-Aronov-Spivak oscillations in an array of InGaAs rings F. Nagasawa et al, PRL 2012 1600 rings r = 608 nm

  12. Weak localization Particle diffusion on time-reversed paths

  13. Magnetic field dependent resistance

  14. Logarithmic temperature dependenceof the resistance in diffusive thin films

  15. Temperature dependentphase coherence time

  16. Reading Chapter 14.8: Conductance fluctuations Chapter 15.1-4: Weak localization effect

More Related