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- Title
Spintronic Quantum Phase Transition in a Graphene/Pb<sub>0.24</sub>Sn<sub>0.76</sub>Te Heterostructure with Giant Rashba Spin‐Orbit Coupling.
- Authors
DeMell, Jennifer E.; Naumov, Ivan; Stephen, Gregory M.; Blumenschein, Nicholas A.; Sun, Y.‐J. Leo; Fedorko, Adrian; Robinson, Jeremy T.; Campbell, Paul M.; Taylor, Patrick J.; Heiman, Don; Dev, Pratibha; Hanbicki, Aubrey T.; Friedman, Adam L.
- Abstract
Mechanical stacking of two dissimilar materials often has surprising consequences for heterostructure behavior. In particular, a 2D electron gas (2DEG) is formed in the heterostructure of the topological crystalline insulator Pb0.24Sn0.76Te and graphene due to contact of a polar with a nonpolar surface and the resulting changes in electronic structure needed to avoid polar catastrophe. The spintronic properties of this heterostructure with non‐local spin valve devices are studied. This study observes spin‐momentum locking at lower temperatures that transitions to regular spin channel transport only at ≈40 K. Hanle spin precession measurements show a spin relaxation time as high as 2.18 ns. Density functional theory calculations confirm that the spin‐momentum locking is due to a giant Rashba effect in the material and that the phase transition is a Lifshitz transition. The theoretically predicted Lifshitz transition is further evident in the phase transition‐like behavior in the Landé g‐factor and spin relaxation time.
- Subjects
QUANTUM phase transitions; TWO-dimensional electron gas; SPIN-orbit interactions; PHASE transitions; RASHBA effect; ELECTRON gas
- Publication
Advanced Functional Materials, 2024, Vol 34, Issue 11, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202311875