Spin-orbit proximity in van der Waals heterostructures

  1. Herling, Franz Peter
Zuzendaria:
  1. Luis Eduardo Hueso Arroyo Zuzendaria
  2. Félix Casanova Fernández Zuzendaria

Defentsa unibertsitatea: Universidad del País Vasco - Euskal Herriko Unibertsitatea

Fecha de defensa: 2022(e)ko martxoa-(a)k 04

Epaimahaia:
  1. Celia Rogero Blanco Presidentea
  2. Sergio Valenzuela Idazkaria
  3. Marko Burghard Kidea
Saila:
  1. Fisika

Mota: Tesia

Teseo: 157383 DIALNET lock_openADDI editor

Laburpena

In this thesis, graphene/transition metal dichalcogenides van der Waals hetero-structures were used to develop a device that combines Hall probes with ferromagnetic electrodes. With it, the spin Hall effect in graphene induced by spin-orbit coupling proximity with MoS2 and WSe2 could unambiguously be demonstrated. The Hanle precession of the non-local resistance not only gives convincing experimental proof but also allows the quantification of the spin transport and the spin-to-charge conversion. The fact that both occur in different parts of the same material gives rise to a high efficiency for the voltage output up to room temperature. Additionally, the control by applying a gate voltage was shown in graphene proximitized with WSe2, enabling a record efficiency measured of around 40 nm. Additionally, in a graphene/WSe2 lateral spin valve, coherent, electrically controllable spin precession in the absence of an external magnetic field was achieved, even in the diffusive regime.