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Título: Magnetically-Defined Qubits on 3D Topological Insulators

Palestrante: Gerson J. Ferreira (IFSC-USP/University of Basel)

In this seminar I'll discuss a brief review of 2D and 3D topological insulator Hamiltonians, and present our recent proposal [G.J.F. and Daniel Loss, arXiv:1305.5003], where we explore time-reversal-symmetry-breaking potentials to confine the surface states of 3D topological insulators into quantum wires and quantum dots. A magnetic domain wall on a ferromagnet insulator cap layer provides interfacial states predicted to show the quantum anomalous Hall effect (QAHE). Here we show that confinement can also occur at magnetic domain heterostructures, with states extended in the inner domain, as well as interfacial QAHE states at the surrounding domain walls. The proposed geometry allows the isolation of the wire and dot from spurious circumventing surface states. For the quantum dots, we find that highly spin-polarized quantized QAHE states at the dot edge constitute a promising candidate for quantum computing qubits.

Local: antiga sala da biblioteca
Horário: 11h - quinta-feira (29/08).

São todos bem vindos!

A programação completa dos seminários pode ser encontrada em:
http://nano.if.uff.br/wiki/doku.php?id=seminars