X. Montiel

Pseudogap, charge order, and pairing density wave at the hot spots in cuprate superconductors

We address the timely issue of the presence of charge ordering at the hot-spots in the pseudo-gap phase of cuprate superconductors in the context of an emergent SU(2)-symmetry which relates the charge and pairing sectors. Performing the Hubbard-Stratonovich decoupling such that the free energy stays always real and physically meaningful we exhibit three solutions of the spin-fermion model at the hot spots. A careful examination of their stability and free energy shows that, at low temperature, the system tends towards a co-existence of charge density wave (CDW) and the composite order parameter made of diagonal quadrupolar density wave and pairing fluctuations of Ref. [Nat. Phys.

Effective SU(2) theory for the pseudogap state

\bf{9}

Charge orders, magnetism and pairings in the cuprate superconductors

, 1745 (2013)].The CDW is sensitive to the shape of the Fermi surface in contrast to the diagonal quadrupolar order, which is immune to it. SU(2) symmetry within the pseudo-gap phase also applies to the CDW state, which therefore admits a pairing density pave counterpart breaking time reversal symmetry.

Evolution of Hall resistivity and spectral function with doping in the SU(2) theory of cuprates

This paper exposes in a detailed manner the recent findings about the SU(2) scenario for the underdoped phase of the Cuprate superconductors. The SU(2) symmetry is formulated as a rotation between the

Proximity effect in atomic-scaled hybrid superconductor/ferromagnet structures: Crucial role of electron spectra

d

Angle resolved photo-emission spectroscopy signature of the resonant excitonic state

-wave SC phase and a

Strong competition between

d

\Theta_{II}

-wave charge order. We define the operators responsible for the SU(2) rotations and we derive the non-linear

-loop-current order and

\sigma

d

-model associated with it. In this framework, we demonstrate that SU(2) fluctuations are massless in finite portions of the Brillouin Zone corresponding to the anti-nodal regions (