Fabrication of novel three-dimensional architectures

The goal is to fabricate three-dimensional nanoarchitectures with large curvature. According to the theoretical prediction (WP2), the radius of curvature in the order of 10 nm has to be achieved to observe sizable curvature effects on the spin-orbit coupling (SOC). The onset of the SOC in curved nanomembranes will be characterized using transport measurements carried out in a nonlocal spin valve configuration (WP3). Therefore, nanoarchitectures will be extended in one dimension for easier positioning of electrical contacts. The width of the nanoarchitecture will be in the hundred nanometers range to position contacts close enough to avoid possible parasitic effects.

Two approaches will be undertaken to fabricate curved three-dimensional nanoarchitectures: (i) ion-beam etching and (ii) anisotropic chemical etching. After the preparation of the curved template, the deposition of the functional layer (paramagnetic Pt, semiconducting InAs and superconducting Nb thin films) will be performed by using magnetron sputtering, electron beam evaporation, or molecular beam epitaxy in the ultra-high vacuum.

designed by
Matias Garcia

The project CNTQC acknowledges the financial support of the Future and Emerging Technologies (FET) programme within the
Seventh Framework Programme for Research of the European Commission, under FET-Open grant number: 618083.