Electrical noise spectroscopy of magnons in a quantum Hall ferromagnet
Artikel i vetenskaplig tidskrift, 2024

Collective spin-wave excitations, magnons, are promising quasi-particles for next-generation spintronics devices, including platforms for information transfer. In a quantum Hall ferromagnets, detection of these charge-neutral excitations relies on the conversion of magnons into electrical signals in the form of excess electrons and holes, but if the excess electron and holes are equal, detecting an electrical signal is challenging. In this work, we overcome this shortcoming by measuring the electrical noise generated by magnons. We use the symmetry-broken quantum Hall ferromagnet of the zeroth Landau level in graphene to launch magnons. Absorption of these magnons creates excess noise above the Zeeman energy and remains finite even when the average electrical signal is zero. Moreover, we formulate a theoretical model in which the noise is produced by equilibration between edge channels and propagating magnons. Our model also allows us to pinpoint the regime of ballistic magnon transport in our device.


Ravi Kumar

Indian Institute of Science

Saurabh Kumar Srivastav

Indian Institute of Science

Ujjal Roy

Indian Institute of Science

Jinhong Park

Karlsruher Institut für Technologie (KIT)

Christian Spånslätt Rugarn

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Kenji Watanabe

National Institute for Materials Science (NIMS)

Takashi Taniguchi

National Institute for Materials Science (NIMS)

Yuval Gefen

Weizmann Institute of Science

Alexander D. Mirlin

Karlsruher Institut für Technologie (KIT)

Anindya Das

Indian Institute of Science

Nature Communications

2041-1723 (ISSN) 20411723 (eISSN)

Vol. 15 1 4998

2D material-baserad teknologi för industriella applikationer (2D-TECH)

GKN Aerospace Sweden (2D-tech), 2021-01-01 -- 2024-12-31.

VINNOVA (2019-00068), 2020-05-01 -- 2024-12-31.

ThErmAl Probes Of fractional quantum hall Transport (TEAPOT)

Europeiska kommissionen (EU) (EC/H2020/101031655), 2022-01-01 -- 2023-12-31.


Den kondenserade materiens fysik





Mer information

Senast uppdaterat