signature=97ff63caecfa073af3d1aaa67415dc20,Signatures of Pauli Blockaded Spin Transport Across Coupl...

摘要：

We theoretically study the spin current and its noise generated between two spin-1/2 spin chains (QSCs) coupled at a single site in the presence of an over-population of spin excitations and a temperature elevation in one subsystem relative to the other, and compare the corresponding transport quantities across two coupled magnetic insulators hosting magnons. In the QSC system, we find that applying temperature bias exclusively leads to a vanishing spin current and a concomitant divergence in the spin Fano factor, defined as the spin current noise-to-signal ratio. By drawing an analogy to the physics of quasiparticle scattering between quantum Hall edge states at a quantum point contact, we attribute the vanishing current to Pauli blockade arising from the fermion statistics of the tunneling spin quasiparticles, and show that such physics does not arise in the magnon scenario. We find that Pauli blockade also leads to noise suppression in the QSC case, and discuss how the Fano factor may be extracted experimentally via the inverse spin Hall effect used extensively in spintronics.

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