Finite frequency noise of a superconductor/ferromagnet quantum point contact

Abstract

We have calculated the finite-frequency current noise of a superconductor-ferromagnet quantum point contact (SF QPC). This signal is qualitatively affected by the spin-dependence of interfacial phase shifts (SDIPS) acquired by electrons upon reflection on the QPC. For a weakly transparent QPC, noise steps appear at frequencies or voltages determined directly by the SDIPS. These steps can occur at experimentally accessible temperatures and frequencies. Finite frequency noise is thus a promising tool to characterize the scattering properties of a SF QPC.

5 pages, 3 figures, revised version, to appear in Phys. Rev. Lett

References in corpus (7)

• Using a quantum dot as a high-frequency shot noise detector
• Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact
• Nanospintronics with carbon nanotubes
• Conductance and current noise of a superconductor/ferromagnet quantum point contact
• Negativity of the excess noise in a quantum wire capacitively coupled to a gate
• The influence of spin-dependent phases of tunneling electrons on the conductance of a point ferromagnet/isolator/superconductor contact
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• Thermodynamic properties of a superconductor interfaced with an altermagnet
• Light emission in delta-T-driven mesoscopic conductors
• P-wave Cooper pair splitting