Control of charge-spin interconversion in van der Waals heterostructures with chiral charge-density wave

CIC nanoGUNE Seminars

Speaker

Zhendong Chi
CIC nanoGUNE

When

2024/03/04
11:00

Place

CIC nanoGUNE Seminar room, Tolosa Hiribidea 76, Donostia-San Sebastian

Host

Felix Casanova

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Spintronics, a field aiming to manipulate the spin current in materials exhibiting strong spin-orbit coupling, has attracted significant interest on its potential application on energy-saving devices capable of replacing traditional electronics. Charge-spin interconversion (CSI), i.e., the bidirectional conversion between spin and charge current, is pivotal for the application of spintronics. Consequently, looking for materials or systems with efficient and controllable CSI is crucial for the development of multifunctional spintronic devices.
In this talk, I will introduce our breakthrough in controlling CSI in graphene/1T-TaS2 van der Waals heterostructures [1]. Our results uncover that the CSI in this system can be switched ON and OFF according to the charge-density wave (CDW) phases of 1T-TaS2. Additionally, we demonstrate that the efficiency of CSI can be modulated by applying a back-gate voltage. Our first-principal calculations indicate that the presence of chiral CDW multidomains in 1T-TaS2 plays the key role in the modulation of CSI.

[1] Z. Chi et al., Advanced Materials https://doi.org/10.1002/adma.202310768 (2024).