Origin and evolution of surface spin current in topological insulators
Artikel i vetenskaplig tidskrift, 2018

The Dirac surface states of topological insulators offer a unique possibility for creating spin polarized charge currents due to the spin-momentum locking. Here we demonstrate that the control over the bulk and surface contribution is crucial to maximize the charge-to-spin conversion efficiency. We observe an enhancement of the spin signal due to surface-dominated spin polarization while freezin g out the bulk conductivity in semiconducting Bi1.5Sb0.5Te1.7Se1.3 below 100K. Detailed measurements up to room temperature exhibit a strong reduction of the magnetoresistance signal between 2and100K, which we attribute to the thermal excitation of bulk carriers and to the electron-phonon coupling in the surface states. The presence and dominance of this effect up to room temperature is promising for spintronic science and technology.

Författare

André Dankert

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Priyamvada Bhaskar

Organisation okänd

Dmitrii Khokhriakov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Isabel Harrysson Rodrigues

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Bogdan Karpiak

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Venkata Kamalakar Mutta

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Uppsala universitet

Sophie Charpentier

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Ion Garate

Université de Sherbrooke

Saroj Prasad Dash

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physical Review B

2469-9950 (ISSN) 2469-9969 (eISSN)

Vol. 97 12 125414

Ämneskategorier

Materialkemi

Annan fysik

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.97.125414

Mer information

Senast uppdaterat

2018-03-29