Sumários

T11 - Electrons in a magnetic field

8 Abril 2024, 15:00 • Maria Margarida Cruz

Hall Effect. Movement of free electrons in a magnetic field. Cyclotron frequency. Movement of free electrons under both normal magnetic and electric fields. Electrons in a solid (Bloch electrons) under normal magnetic and electric fields.

T10 - Landauer-Buttiker formalism

25 Março 2024, 17:30 • Maria Margarida Cruz

What conductance is experimentally measured in mesoscopic systems. Influence of contacts.
Landauer-Buttiker formalism.

T9 - Characteristic lengths

25 Março 2024, 15:00 • Maria Margarida Cruz

Characteristic lengths at the nanoscale: Fermi wavelength, elastic mean free path, phase coherence length, thermal length.

Transport characteristics according to the relation between system size and the referred lengths.

T8 - Interfaces and 2DEG

18 Março 2024, 17:30 • Maria Margarida Cruz

p-n junction. Semiconductor metal junctions. Schottky barrier. Rectifier contacts and ohmic contacts.

MOS interface and two-dimensional electron gas formation (2DEG). Production of 2DEG using junctions of two different semiconductors. Triangular potential well.

T7 - Surface and interface electronic states

18 Março 2024, 15:00 • Maria Margarida Cruz

Surfaces and interfaces. p-n junction as an example of an interface between semiconductors. surface states.
Modification of surface electronic states: band adjustment and "band-bending"."Pinning" of the Fermi energy.