Odd-frequency Cooper pairs and zero-energy surface bound states in superfluid 3He

S. Higashitani; S. Matsuo; Y. Nagato; K. Nagai; S. Murakawa; R. Nomura; Y. Okuda

doi:10.1103/PhysRevB.85.024524

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Odd-frequency Cooper pairs and zero-energy surface bound states in superfluid 3He

S. Higashitani, S. Matsuo, Y. Nagato, K. Nagai, S. Murakawa, R. Nomura, Y. Okuda

DOI 10.1103/PhysRevB.85.024524 · Physical Review B

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Abstract

We study the odd-frequency Cooper pairs formed near the surface of superfluid 3He. The odd-frequency pair amplitude is closely related to the local density of states in the low-energy limit. We derive a formula relating explicitly the two quantities. This formula holds for an arbitrary boundary condition at the surface. We also present some numerical results on the surface odd-frequency pair amplitude in superfluid 3He-B. Those analytical and numerical results allow one to interpret the midgap surface density of states, observed recently by transverse acoustic impedance measurements on superfluid 3He-B, as the manifestation of the surface odd-frequency state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown