Fermi Surface Reconstruction by Dynamic Magnetic Fluctuations and Spin-Charge Separation Near an O(3) Quantum Critical Point

Abstract

Stimulated by the small/large Fermi surface controversy in the cuprates we consider a small number of holes injected into the bilayer antiferromagnet. The system has an O(3) quantum critical point (QCP) separating the magnetically ordered and the magnetically disordered phases. We demonstrate that nearly critical quantum magnetic fluctuations can change the Fermi surface topology and also lead to spin charge separation (SCS) in two dimensions. We demonstrate that in the physically interesting regime there is a magnetically driven Lifshitz point (LP) inside the magnetically disordered phase. At the LP the topology of the hole Fermi surface is changed. The position of the LP, while being close to the position of the QCP is generally different. Dependent on the additional hole hopping integrals $t^{\prime }$ and $t^{\prime \prime }$, the LP can be located either in the magnetically ordered phase and/or in the magnetically disordered phase. We also demonstrate that in this regime the hole spin and charge necessarily separate when approaching the QCP. The considered model sheds light on generic problems concerning the physics of the cuprates.

13 pages, 10 figures

References in corpus (11)

• Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor
• Electronic liquid crystal state in the high-temperature superconductor YBCO(6.45)
• A Phenomenological Theory of The Pseudogap State
• Spin dynamics in the pseudogap state of a high-temperature superconductor
• Low-Energy Electronic Structure of the High-Tc Cuprates La2-xSrxCuO4 Studied by Angle-resolved Photoemission Spectroscopy
• On the Reconstructed Fermi Surface in the Underdoped Cuprates
• Spin dynamics near the critical doping in weakly-superconducting underdoped YBa2Cu3O6.35 (Tc=18K)
• Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors
• Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnets
• Effective action, magnetic excitations and quantum fluctuations in lightly doped single layer cuprates
• Single hole dynamics in the Kondo Necklace and Bilayer Heisenberg models on a square lattice