1201.5700 (Michael Holt et al.)

Fermi Surface Reconstruction by Dynamic Magnetic Fluctuations    [PDF]

Michael Holt, Jaan Oitmaa, Wei Chen, Oleg P. Sushkov

Motivated by the small/large Fermi surface controversy in the cuprates we
study the two-dimensional bilayer $t-t^{\prime}-t^{\prime\prime}-J-J_{\perp}$
model at small doping. Magnetic dynamics are driven exclusively by $J$ and
$J_{\perp}$. The O(3) quantum critical point (QCP) at $J_{\perp}/J\approx 2.5$
separates the magnetically ordered and the magnetically disordered phases. 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. We also demonstrate that in
the regime when the LP is inside the magnetically disordered phase the hole
spin and charge separate when approaching the QCP.

View original: http://arxiv.org/abs/1201.5700