Asymmetric quantum shot noise in magnon transport
arXiv:1903.10639 · doi:10.1103/PhysRevB.99.134403
Abstract
We study a frequency-dependent noise-to-current ratio for asymmetric, symmetric, and noncommutative current-noise in a ferromagnetic insulating junction, and extract quantum-mechanical properties of magnon transport at low temperatures. We demonstrate that the noncommutative noise, vanished in the dc-limit (i.e., a classical regime), increases monotonically as a function of frequency, and show that the noncommutative noise associated directly with quantum fluctuations of magnon currents breaks through the classical upper limit determined by the symmetric noise and realizes asymmetric quantum shot noise. Finally, we show that our theoretical predictions are within experimental reach with current device and measurement scheme while exploiting low temperatures. Our work provides a platform toward experimental access to quantum fluctuations of magnon currents.
arXiv comment8 pages, 2 figures, accepted for publication in Phys. Rev. B: Measurement of a magnon current noise in an insulating magnet has been reported in arXiv:1810.01500 [S. Rumyantsev et al., Appl. Phys. Lett. 114, 090601 (2019)]
References in corpus (23)
- Shot Noise in Mesoscopic Conductors
- Nonlocal magnetization dynamics in ferromagnetic heterostructures
- Microscopic approach to current-driven domain wall dynamics
- Probing Entanglement and Non-locality of Electrons in a Double-Dot via Transport and Noise
- Noise of Entangled Electrons: Bunching and Antibunching
- Detection of Quantum Noise from an Electrically-Driven Two-Level System
- Gigantic enhancement of spin Seebeck effect by phonon drag
- Noise of a Quantum-Dot System in the Cotunneling Regime
- Super-Poissonian shot noise of squeezed-magnon mediated spin transport
- Noise in Multiterminal Diffusive Conductors: Universality, Nonlocality and Exchange Effects
- Introduction to Nonequilibrium Statistical Mechanics with Quantum Field
- Josephson and Persistent Spin Currents in Bose-Einstein Condensates of Magnons
- Emission and absorption asymmetry in the quantum noise of a Josephson junction
- Spin Currents and Magnon Dynamics in Insulating Magnets
- Asymmetric Quantum Shot Noise in Quantum Dots
- Universality of Shot-Noise in Multiterminal Diffusive Conductors
- Theory of spin Peltier effect
- Quantum Dynamics of Skyrmions in Chiral Magnets
- Wiedemann-Franz Law for Magnon Transport
- Magnon-mediated spin current noise in ferromagnetnon-magnetic conductor hybrids
- Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator CuOSeO
- The Discrete Noise of Magnons
- Magnonic Noise and Wiedemann-Franz Law