Orbital currents and cheap vortices in underdoped cuprates

Details Orbital currents and cheap vortices in underdoped cuprates Orbital currents and cheap vortices in underdoped cuprates

2002-10-04

arxiv.org/abs/cond-mat/0210113v2

Physics

Condensed Matter

Proceedings of LT23 Conference Updated references and corrected typos

Scientific paper

10.1016/S0921-4534(02)02602-3

In the past several years, we have developed a theory for the underdoped cuprates in collaboration with X.-G. Wen, based on an SU(2) formulation of the t-J model. In this formulation, the staggered flux state plays a central role as the progenitor of the Neel state at half-filling and a close competitor to the d-wave superconductor with small doping where it is characterized by staggered orbital currents. We found support for this point of view when we discovered fluctuating orbital currents in the Gutzwiller projected BCS wavefunction. We shall argue that low-energy vortices, where the staggered flux state is stabilized in the core, are needed to explain many of the unusual properties of underdoped cuprates. Proposed experiments to look for these orbital currents will be discussed.

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