Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 34, Issue 48, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-648X/ac9812
Keywords
magnetic van der Waals materials; Coulomb engineering; 1T-TaS2
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Funding
- Academy of Finland [331342, 336243]
- Academy of Finland (AKA) [331342, 336243, 331342] Funding Source: Academy of Finland (AKA)
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Coulomb engineering is proposed as a versatile strategy to tailor magnetic ground states in layered materials, and it can precisely manipulate the frustrated magnetic order in two-dimensional materials by means of environmental dielectric screening.
Magnetic frustrations in two-dimensional materials provide a rich playground to engineer unconventional phenomena. However, despite intense efforts, a realization of tunable frustrated magnetic order in two-dimensional materials remains an open challenge. Here we propose Coulomb engineering as a versatile strategy to tailor magnetic ground states in layered materials. Using the frustrated van der Waals monolayer 1T-TaS2 as an example, we show how long-range Coulomb interactions renormalize the low energy nearly flat band structure, leading to a Heisenberg model which depends on the Coulomb interactions. Based on this, we show that superexchange couplings in the material can be precisely tailored by means of environmental dielectric screening, ultimately allowing to externally drive the material towards a tunable frustrated regime. Our results put forward Coulomb engineering as a powerful tool to manipulate magnetic properties of van der Waals materials.
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