Influence of size effect and electronic viscosity on magnetoresistance of mesoscopic 2D conductors

In small (mesoscopic) two-dimensional electron systems with non-ideal boundaries, the magnetoresistance shows a considerable size effect related to cyclotron motion of electrons in the quasi-ballistic regime. With increasing temperature, the resistance becomes modified by electron-electron interaction and shows signatures of hydrodynamic viscosity effect. The kinetic equation approach is applied to describe the magnetoresistance of narrow electron channels in a wide range of parameters, from quasi-ballistic to hydrodynamic transport regimes, and the theoretical results are in a good agreement with the experimental data obtained in high-mobility channels of several micron width.

The talk contains a general overview of both hydrodynamic and kinetic approaches to the problem of magneto transport, with description of both underlying physics and theoretical methods, and a comparison of theory with experiment.

 

Seminário do Departamento de Física dos Materiais e Mecânica do Instituto de Física da Universidade de São Paulo (DFMT-IFUSP). 

 

Observação: Ao clicar no link seu computador (celular, tablet, ipad, etc.) automaticamente instalará o programa. Se não entrar automaticamente clique em ‘join a meeting’ ou ‘entrar em uma reunião’ e digite a sequência de 9 dígitos: 908-724-552. Havendo dúvidas, por favor, entre em contato com o Prof. Dr. Alexandre Levine: alevin@if.usp.br.

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