Anomalous Charge Dynamics in the Superconducting State of Underdoped Cuprates

TL;DR

This paper analyzes the low-temperature behavior of superfluid stiffness in underdoped cuprates, highlighting the importance of doping-dependent anisotropy and providing a Fermi liquid framework that clarifies previous discrepancies.

Contribution

It introduces Fermi liquid expressions for superfluid stiffness in underdoped cuprates and explains the role of doping-dependent anisotropy in their behavior.

Findings

Superfluid stiffness behavior is strongly doping-dependent.

Anisotropy affects states near zone corners more than diagonals.

The proposed model clarifies differences from previous theories.

Abstract

We present fermi liquid expressions for the low temperature behavior of the superfluid stiffness, explain why they differ from those suggested recently by Lee and Wen, and discuss their applicability to data on high-$T_c$ superconductors. We find that a consistent description requires a strong, doping dependent anisotropy, which affects states near the zone corners much more strongly than those near the zone diagonals.