Szalowski, Karol and Milivojevic, Marko and Kochan, Denis and Gmitra, Martin (2023) Spin–orbit and exchange proximity couplings in graphene/1T-TaS2 heterostructure triggered by a charge density wave. 2D MATERIALS, 10 (2): 025013. ISSN 2053-1583,
Full text not available from this repository. (Request a copy)Abstract
Proximity-induced fine features and spin-textures of the electronic bands in graphene-based van der Waals heterostructures can be explored from the point of tailoring a twist angle. Here we study spin-orbit coupling and exchange coupling engineering of graphene states in the proximity of 1T-TaS2 not triggering the twist, but a charge density wave (CDW) in 1T-TaS2-a realistic low-temperature phase. Using density functional theory and effective model we found that the emergence of the CDW in 1T-TaS2 significantly enhances Rashba spin-orbit splitting in graphene and tilts the spin texture by a significant Rashba angle-in a very similar way as in the conventional twist-angle scenarios. Moreover, the partially filled Ta d-band in the CDW phase leads to the spontaneous emergence of the in-plane magnetic order that transgresses via proximity from 1T-TaS2 to graphene, hence, simultaneously superimposing along the spin-orbit also the exchange coupling proximity effect. To describe this intricate proximity landscape we have developed an effective model Hamiltonian and provided a minimal set of parameters that excellently reproduces all the spectral features predicted by the first-principles calculations. Conceptually, the CDW provides a highly interesting knob to control the fine features of electronic states and to tailor the superimposed proximity effects-a sort of twistronics without twist.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DER-WAALS HETEROSTRUCTURES; PHASE-TRANSITIONS; 1T-TAS2; MONOLAYER; PSEUDOPOTENTIALS; STATE; PURE; charge density wave; proximity effects; spin-orbit coupling; exchange coupling; graphene; van der Waals heterostructures; transition metal dichalcogenides |
| Subjects: | 500 Science > 530 Physics 600 Technology > 620 Engineering & allied operations |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Mar 2024 11:48 |
| Last Modified: | 23 Mar 2024 11:51 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60438 |
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