Spin waves in canted antiferromagnet of bilayer graphene
ORAL
Abstract
Antiferromagnets are promising candidates for spintronics applications thanks to their high-frequency dynamics and insensitivity to external magnetic field perturbations. The \nu=0 quantum Hall state in bilayer graphene supports a canted antiferromagnetic (CAF) phase when a small electric field is applied perpendicular to the plane. This state is predicted to support dissipationless spin transport through a superfluidity mechanism [1]. Previous experiments showed that spin waves can be excited by a finite dc bias on one side of a quantum Hall region and detected on the other side using a non-local transport setup [2, 3]. Here we report on spin wave transport through the \nu=0 CAF state of bilayer graphene. In our devices, we observe spin wave excitations with non-zero dc bias thresholds similar to what’s reported [2]. We also observe, in certain measurement setups, strong non-local signals with a dc bias threshold close to zero, only when the \nu=0 state is in the CAF phase. We present the temperature, magnetic field, and electric field dependence of the zero-threshold signal and discuss potential origins.
[1] Takei et al., PRL 116, 216801 (2016)
[2] Wei et al., Science 362, 229–233 (2018)
[3] Stepanov et al., Nature Physics 14, 907–911 (2018)
[1] Takei et al., PRL 116, 216801 (2016)
[2] Wei et al., Science 362, 229–233 (2018)
[3] Stepanov et al., Nature Physics 14, 907–911 (2018)
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Presenters
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Hailong Fu
- Pennsylvania State University