scholarly journals Negative Energy Antiferromagnetic Instantons Forming Cooper-Pairing ‘Glue’ and ‘Hidden Order’ in High-Tc Cuprates

2018 ◽  
Vol 3 (4) ◽  
pp. 39 ◽  
Author(s):  
Sergei Mukhin
Keyword(s):  
Spin Density ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Spin Density Wave ◽  
Mean Field ◽  
Analytical Form ◽  
Negative Energy ◽  
Cooper Pairing ◽  
Hidden Order ◽  
The Green Function

An emergence of magnetic boson of instantonic nature, that provides a Cooper-‘pairing glue’, is considered in the repulsive ‘nested’ Hubbard model of superconducting cuprates. It is demonstrated that antiferromagnetic instantons of a spin density wave type may have negative energy due to coupling with Cooper pair condensate. A set of Eliashberg like equations is derived and solved self-consistently, proving the above suggestion. An instantonic propagator plays the role of the Green function of the pairing ‘glue’ boson. Simultaneously, the instantons defy condensation of the mean-field spin-density wave (SDW) order. We had previously demonstrated in analytical form that periodic chain of instanton-anti-instanton pairs along the axis of Matsubara time has zero scattering cross section for weakly perturbing external probes, like neutrons, etc., thus representing a ‘hidden order’. Hence, the two competing orders, superconducting and antiferromagnetic, may coexist (below some T c ) in the form of the superconducting order coupled to ‘hidden’ instantonic one. This new picture is discussed in relation with the mechanism of high temperature superconductivity.

scholarly journals URu2Si2 under intense magnetic fields: From hidden order to spin-density wave

2018 ◽  
Vol 536 ◽  
pp. 457-460 ◽  
Author(s):  
W. Knafo ◽  
D. Aoki ◽  
G.W. Scheerer ◽  
F. Duc ◽  
F. Bourdarot ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Hidden Order

scholarly journals Superconductivity in the doped Hubbard model and its interplay with next-nearest hopping t′

Science ◽  
2019 ◽  
Vol 365 (6460) ◽  
pp. 1424-1428 ◽  
Author(s):  
Hong-Chen Jiang ◽  
Thomas P. Devereaux
Keyword(s):  
Hubbard Model ◽  
Charge Density ◽  
Spin Density ◽  
Charge Density Wave ◽  
Large Scale ◽  
Nearest Neighbor ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Spin Density Wave ◽  
Hole Doping

The Hubbard model is widely believed to contain the essential ingredients of high-temperature superconductivity. However, proving definitively that the model supports superconductivity is challenging. Here, we report a large-scale density matrix renormalization group study of the lightly doped Hubbard model on four-leg cylinders at hole doping concentration δ = 12.5%. We reveal a delicate interplay between superconductivity and charge density wave and spin density wave orders tunable via next-nearest neighbor hopping t′. For finite t′, the ground state is consistent with a Luther-Emery liquid with power-law superconducting and charge density wave correlations associated with half-filled charge stripes. In contrast, for t′ = 0, superconducting correlations fall off exponentially, whereas charge density and spin density modulations are dominant. Our results indicate that a route to robust long-range superconductivity involves destabilizing insulating charge stripes in the doped Hubbard model.

d-wave Cooper pairing near or in the spin-density-wave state

1990 ◽  
Vol 41 (10) ◽  
pp. 7264-7266 ◽  
Author(s):  
Hanyou Chu ◽  
E. W. Fenton
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Cooper Pairing ◽  
Wave State ◽  
D Wave

STABILITY AND SPIN DENSITY WAVE IN POLYMERIC HUBBARD CHAINS

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2586-2591 ◽  
Author(s):  
Y. F. DUAN ◽  
Z. L. LIU ◽  
K. L. YAO
Keyword(s):  
Spin Density ◽  
Mean Field Theory ◽  
Density Wave ◽  
Spin Density Wave ◽  
Mean Field ◽  
Coulomb Repulsion ◽  
Flat Band ◽  
Antiferromagnetic Order ◽  
Half Filling ◽  
The Mean

The ground state properties and spin-density wave of polymeric Hubbard chains are studied by means of the mean-field theory. It is shown that topological structure of the chain possesses a flat-band structure of the energy band. Our analysis shows that the on- site Coulomb repulsion of electrons in the chain leads to the coexistence of ferromagnetic and antiferromagnetic order, i,e., the ferrimagnetic order. Away from half filling, the system displays magnetic phase separation. Possible experimental realizations are suggested.

scholarly journals Field-induced spin-density wave beyond hidden order in URu2Si2

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
W. Knafo ◽  
F. Duc ◽  
F. Bourdarot ◽  
K. Kuwahara ◽  
H. Nojiri ◽  
...  
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Hidden Order
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