Electrical noise spectroscopy of magnons in a quantum Hall ferromagnet
arXiv:2310.08703 · doi:10.1038/s41467-024-49446-z
Abstract
Collective spin-wave excitations-magnons-in a quantum Hall ferromagnet are promising quasi-particles for next-generation spintronics devices, including platforms for information transfer. 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 these signals are equal the magnon detection remains elusive. 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 generated by equilibration (partial or full, depending on the bias voltage) between edge channels and propagating magnons. Our model, which agrees with experimental observations, also allows us to pinpoint the regime of ballistic magnon transport in our device.
References in corpus (37)
- Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
- Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
- Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
- Unconventional quantum Hall effect and Berry's phase of 2pi in bilayer graphene
- Unconventional Integer Quantum Hall effect in graphene
- The hot pick-up technique for batch assembly of van der Waals heterostructures
- Fractional Chern insulators in magic-angle twisted bilayer graphene
- Spin Filtered Edge States and Quantum Hall Effect in Graphene
- Cleaning Interfaces in Layered Materials Heterostructures
- Entanglement-based single-shot detection of a single magnon with a superconducting qubit
- Strongly Correlated Chern Insulators in Magic-Angle Twisted Bilayer Graphene
- Coulomb-driven broken-symmetry states in doubly gated suspended bilayer graphene
- Spin and valley quantum Hall ferromagnetism in graphene
- Broken symmetry states and divergent resistance in suspended bilayer graphene
- Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state
- Quantum Ferromagnetism and Phase Transitions in Double-Layer Quantum Hall Systems
- Symmetry broken Chern insulators and magic series of Rashba-like Landau level crossings in magic angle bilayer graphene
- Tunable Fractional Quantum Hall Phases in Bilayer Graphene
- Symmetry breaking of the zero energy Landau level in bilayer graphene
- Spin wave imaging in atomically designed nanomagnets
- Long-Distance Spin Transport Through a Graphene Quantum Hall Antiferromagnet
- Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor
- Ferroic collinear multilayer magnon spin valve
- Electrical generation and detection of spin waves in a quantum Hall ferromagnet
- Evolution of Landau Levels into Edge States at an Atomically Sharp Edge in Graphene
- Skyrmion solids in monolayer graphene
- Vanishing thermal equilibration for hole-conjugate fractional quantum Hall states in graphene
- Topological classification of shot noise on fractional quantum Hall edges
- Broken SU(4) Symmetry and The Fractional Quantum Hall Effect in Graphene
- Broadband microwave detection using electron spins in a hybrid diamond-magnet sensor chip
- Edge Channels of Broken-Symmetry Quantum Hall States in Graphene probed by Atomic Force Microscopy
- Observation of ballistic upstream modes at fractional quantum Hall edges of graphene
- Noise on complex quantum Hall edges: Chiral anomaly and heat diffusion
- Determination of topological edge quantum numbers of fractional quantum Hall phases
- Realizing Universal Edge Properties in Graphene Fractional Quantum Hall Liquids
- Visualization of moiré magnons in monolayer ferromagnet
- Hierarchy of Spin and Valley Symmetry Breaking in Quantum Hall Single Layer Graphene
Cited by in corpus (5)
- Absence of heat flow in ν = 0 quantum Hall ferromagnet in bilayer graphene
- Fractional quantum Hall coexistence phases in higher Landau levels of graphene
- Half-integer thermal conductance in the absence of Majorana mode
- Landscapes of an out-of-equilibrium anyonic sea
- Spontaneous Breaking of the SU(3) Flavor Symmetry in a Quantum Hall Valley Nematic