Projects per year
Description
The recent discovery of the persistence of long-range magnetic order when van der Waals layered magnets are thinned towards the monolayer limit has provided a tunable platform for the engineering of novel magnetic structures and devices. Here, we study the evolution of the electronic structure of CrGeTe3 as a function of electron doping in the surface layer. From angle-resolved photoemission spectroscopy, we observe spectroscopic fingerprints that this electron doping drives a marked increase in TC, reaching values more than double that of the undoped material, in agreement with recent studies using electrostatic gating. Together with density functional theory calculations and Monte Carlo simulations, we show that, surprisingly, the increased TC is mediated by the population of spin-minority Cr t2g states, forming a half-metallic 2D electron gas at the surface. We show how this promotes a novel variant of double exchange, and unlocks a significant influence of the Ge – which was previously thought to be electronically inert in this system – in mediating Cr-Cr exchange.
Date made available | 17 Jan 2025 |
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Publisher | University of St Andrews |
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Controlling and integrating 2D magnetism: Controlling and integrating 2D magnetism in epitaxial van der Waals heterostructures
King, P. (PI) & Wahl, P. (CoI)
1/08/23 → 31/07/26
Project: Standard
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An electronic structure perspective: An electronic structure perspective on quasi-2D magnetism in layered chalcogenides
King, P. (PI)
15/02/23 → 14/02/25
Project: Standard
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Engineered Quantum States: Engineered quantum states via atmoic-scale assembly of artificial 2D heterostructures
King, P. (PI)
1/08/17 → 31/07/22
Project: Standard
Research output
- 1 Article
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Charge doping into spin minority states mediates doubling of TC in ferromagnetic CrGeTe3
Trzaska, L., Qiao, L., Watson, M. D., Hatnean, M. C., Markovic, I., Abarca Morales, E., Antonelli, T., Cacho, C., Balakrishnan, G., Ren, W., Picozzi, S. & King, P. D. C., 17 Jan 2025, In: npj 2D Materials and Applications. 9, 7 p., 4.Research output: Contribution to journal › Article › peer-review
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