Sumários
T6 - 1d conductivity
11 Março 2024, 17:30 • Maria Margarida Cruz
1d electrical conduction in mesoscopic system. Ballistic transport.
Confinement in a gas d=2 ("Quantum point contact").
Landauer formula for non-reflecting contacts. Contact resistance. Contribution of one or more sub-bands. Coherent transport through a one-dimensional conductor with a scattering center. Associated resistance. T5 - Boltzmann equation
11 Março 2024, 15:00 • Maria Margarida Cruz
The diffusive electrical transport in different dimensions.
Einstein relations between mobility and diffusion constant.
T4 - Diffusive transport
4 Março 2024, 17:30 • Maria Margarida Cruz
Electrical transport. Approximation of relaxation time and diffusive transport.
Transport on a two-dimensional conductor.
Relaxation of confinement in a two-dimensional gas and transition to a three-dimensional gas.
The Boltzmann equation for transport.
T3 - Semiconductor materials
4 Março 2024, 15:00 • Maria Margarida Cruz
Pure semiconductors and doped semiconductors. The tight binding approach for electronic states in semiconductors.
Transport by electronic states. Contribution to the transport of a filled band.
Electrical transport in macroscopic materials using semi-classical model.
T2 - Solid State Overview
26 Fevereiro 2024, 17:30 • Maria Margarida Cruz
Revisiting some important concepts in Solid State Physics 1
Electronic structure of materials and energy bands in a solid. The free and nearly-free electron model for describing electrons in a metal. The density of states in 3d and 2d. Classification
of materials into conductors, insulators and semiconductors and relationship
with their electronic structure.
Electrons and holes..