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Two-impurity helical Majorana problem
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DOI：10.1103/PhysRevB.91.064501.png)
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Abstract
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We predict experimentally accessible signatures for helical Majorana fermions in a topological superconductor by coupling to two quantum dots in the local moment regime (corresponding to spin-1/2 impurities). Taking into account Ruderman-Kittel-Kasuya-Yosida interactions mediated by bulk and edge modes, where the latter cause a long-range antiferromagnetic Ising coupling, we formulate and solve the low-energy theory for this two-impurity helical Majorana problem. In particular, we show that the long-time spin dynamics after a magnetic field quench displays weakly damped oscillations with universal quality factor.
Keywords:
SUPERCONDUCTOR
NANOWIRE
FERMIONS
SIGNATURE
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