scholarly journals Low-energy quasi-one-dimensional spin dynamics in charge-ordered La2−xSrxNiO4

2011 ◽  
Vol 83 (9) ◽  
Author(s):  
P. G. Freeman ◽  
D. Prabhakaran ◽  
K. Nakajima ◽  
A. Stunault ◽  
M. Enderle ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Low Energy ◽  
One Dimensional

Spin Dynamics in the Metallic State of YBa2(Cu0.98 Zn0.02) 3O6+x

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3330-3334 ◽  
Author(s):  
Y. Sidis ◽  
P. Bourges ◽  
B. Hennion ◽  
R. Villeneuve ◽  
G. Collin ◽  
...  
Keyword(s):  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Low Energy ◽  
Metallic State ◽  
Magnetic Fluctuations ◽  
Local Enhancement ◽  
Compound I ◽  
Nonmagnetic Impurities

Inelastic neutron scattering measurements have been carried out on a YBa2(Cu0.98-Zn0.02)3O 6+x single crystal in both underdoped (x = 0.7) and overdoped (x = 0.97) regimes. In the zinc substituted system, spin dynamics is drastically changed in respect to the pure compound: (i) the "resonance peak" almost vanishes, (ii) the spin gap is filled, (iii) new antiferromagnetic excitations are found at low energy. These new magnetic fluctuations, which persist in the normal state, account for a local enhancement of AF correlations around nonmagnetic impurities. Besides, it is worth emphasizing that features, not directly related to superconductivity, i.e., the contribution to the spin dynamics apart from the resonance peak and the "spin pseudo-gap" observed in the underdoped regime above T c , coexist with the new low energy magnetic fluctuations.

scholarly journals Dynamical Charge Structure Factor of a One-Dimensional Ionic Hubbard Model in the Low-Energy Region

2019 ◽  
Vol 88 (5) ◽  
pp. 054709
Author(s):  
Yuhei Komaki ◽  
Yuma Iwase ◽  
Shogo Yanagimatsu ◽  
Yoshiyuki Muta ◽  
Nobuya Maeshima ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Structure Factor ◽  
Energy Region ◽  
Low Energy ◽  
Charge Structure ◽  
One Dimensional ◽  
Ionic Hubbard Model ◽  
Dynamical Charge

scholarly journals TRIONIC AND QUARTETTING PHASES IN ONE-DIMENSIONAL MULTICOMPONENT ULTRACOLD FERMIONS

2008 ◽  
Vol 17 (10) ◽  
pp. 2110-2117 ◽  
Author(s):  
P. LECHEMINANT ◽  
P. AZARIA ◽  
E. BOULAT ◽  
S. CAPPONI ◽  
G. ROUX ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Nuclear Physics ◽  
Bound States ◽  
Cold Atoms ◽  
Low Energy ◽  
Low Density ◽  
Large Domain ◽  
One Dimensional ◽  
Fermionic Systems ◽  
Numerical Approaches

We investigate the possible formation of a molecular condensate, which might be, for instance, the analogue of the alpha condensate of nuclear physics, in the context of multicomponent cold atoms fermionic systems. A simple paradigmatic model of N-component fermions with contact interactions loaded into a one-dimensional optical lattice is studied by means of low-energy and numerical approaches. For attractive interaction, a quasi-long-range molecular superfluid phase, formed from bound-states made of N fermions, emerges at low density. We show that trionic and quartetting phases, respectively for N = 3,4, extend in a large domain of the phase diagram and are robust against small symmetry-breaking perturbations.

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