Skip to ContentSkip to Navigation
About usNews and EventsNews articles

Electron many-body effects in quantum point contacts

13 July 2012

PhD ceremony: Mr. M.J. Iqbal, 11.00 uur, Academiegebouw, Broerstraat 5, Groningen

Dissertation: Electron many-body effects in quantum point contacts

Promotor(s): prof. C.H. van der Wal

Facultty: Mathematics and Natural Sciences

How does electrical current flow in the smallest wires that can be realized? This PhD thesis presents experimental research that aimed at understanding this at a very fundamental level. The smallest wires that can be made are fabricated with nanotechnology, and have dimensions at the nanoscale. The width of such wires is at the scale of the quantum mechanical wavelength of electrons that flow in the wire, and this is not much larger than the scale of the individual atoms of the material that forms the wire. In such very small wires the electrical current behaves different than in wires that are larger (as the wires in our daily life). Electrons do not flow as individual electrons, but the electrical current depends on how a cloud of interacting electrons (electrons that feel each other’s presence) can flow in the wire. The work in this thesis discovered the underlying physics for this phenomenon, which was an important and highly debated open question in the field of nanoscience since 1996.

These studies were carried out under extreme conditions, where the electrical current shows most strongly how the interactions between electrons influence the electrical current. The wires were therefore made in extremely pure semiconductors, and studied at temperatures of less than 1 degree above absolute zero temperature (about 273 degrees Celsius below zero). The results are important for building the computers of the future.

Last modified:15 September 2017 3.41 p.m.
printView this page in: Nederlands

More news

  • 16 July 2019

    Thirteen Veni grants for young Groningen researchers

    Thirteen researchers from the University of Groningen (UG) and the UMCG have been awarded Veni grants within the framework of NWO’s Innovational Research Incentives Scheme. A terrific result building on last year's successes, where 12 Groningen researchers...

  • 11 July 2019

    UG to build new observatory in dark Lauwersmeer Region

    The Kapteyn Astronomical Institute of the University of Groningen is working on a concrete plan for a new observatory in the Dark Sky Park Lauwersmeer. The observatory will be placed at the Lauwersnest Activity Centre of Staatsbosbeheer in Lauwersoog...

  • 11 July 2019

    Major companies’ annual reports too vague about climate impact

    Many major Dutch companies publish extensive information about climate impact in their annual reports. However, very few companies provide concrete, detailed information about their own CO2 emissions, the impact of climate change on their business...