Sumários
T7 - Coherent Transport
8 Novembro 2022, 14:00 • Maria Margarida Cruz
Coherent transport through a one-dimensional conductor with two scattering centers. Scattering matrix (S) and transfer matrix (T). Relationship between both matrices.
Difference between the electrical resistances obtained with coherent transport and with incoherent transport. Diffusive coherent transport. Weak localization effect.
Electrons with trajectories enclosing magnetic flux. Phase variation. Aharonov-Bohm effect.
Explanation of the destruction of the weak localization effect by the magnetic field.
Weak localization and Aharonov-Bohm effect h/2e.
Problems 5
25 Outubro 2022, 16:30 • Maria Margarida Cruz
Resolution and discussion of problems in series 4 - Ballistic transport.
Evaluation problem 2.
T6 - Landauer-Buttiker formalism
25 Outubro 2022, 14:00 • Maria Margarida Cruz
What conductivity is experimentally measured in mesoscopic systems. Influence of contacts.
Landauer-Buttiker formalism.
Application example.
Problems 4
18 Outubro 2022, 16:30 • Maria Margarida Cruz
Resolution and discussion of problems in series 5 - relevant lengths at the nanoscale