scholarly journals Dynamical spin excitations of the topological Haldane gapped phase in the S=1 Heisenberg antiferromagnetic chain with single-ion anisotropy

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Jun-Han Huang ◽  
Guang-Ming Zhang ◽  
Dao-Xin Yao
Keyword(s):  
Spin Excitations ◽  
Dynamical Spin

High-energy magnetic excitations in cuprate superconductors

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542001
Author(s):  
Lulin Kuang ◽  
Yu Lan ◽  
Huaisong Zhao ◽  
Shiping Feng
Keyword(s):  
Charge Carrier ◽  
Cuprate Superconductors ◽  
Parent Compound ◽  
High Energy ◽  
Magnetic Excitations ◽  
Self Energy ◽  
Spin Excitations ◽  
Dynamical Spin ◽  
Carrier Doping ◽  
Modest Effect

In this paper, the high-energy magnetic excitations in cuprate superconductors are studied based on the kinetic energy driven superconducting mechanism. The spin self-energy is evaluated explicitly in terms of the collective charge carrier modes in the particle–hole and particle–particle channels, and employed to calculate the dynamical spin structure factor. Our results show the existence of damped but well-defined dispersive spin excitations in the whole doping phase diagram. In particular, the charge carrier doping has a more modest effect on the high-energy spin excitations, and then the high-energy magnetic excitations retain roughly constant energy as a function of doping, with spectral weights and dispersion relations comparable to those found in the parent compound.

scholarly journals Relativistic dynamical spin excitations of magnetic adatoms

2015 ◽  
Vol 91 (7) ◽  
Author(s):  
M. dos Santos Dias ◽  
B. Schweflinghaus ◽  
S. Blügel ◽  
S. Lounis
Keyword(s):  
Spin Excitations ◽  
Dynamical Spin

scholarly journals Evolution of spin excitations from bulk to monolayer FeSe

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonathan Pelliciari ◽  
Seher Karakuzu ◽  
Qi Song ◽  
Riccardo Arpaia ◽  
Abhishek Nag ◽  
...  
Keyword(s):  
Quantum Monte Carlo ◽  
Spin Dynamics ◽  
Spin Fluctuations ◽  
Superconducting Transition ◽  
Pairing Mechanism ◽  
Range Magnetic Order ◽  
X Ray Scattering ◽  
Spin Excitations ◽  
Order Of Magnitude ◽  
Long Range Magnetic Order

AbstractIn ultrathin films of FeSe grown on SrTiO3 (FeSe/STO), the superconducting transition temperature Tc is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other superconductors, antiferromagnetic spin fluctuations have been proposed to mediate SC making it essential to study the evolution of the spin dynamics of FeSe from the bulk to the ultrathin limit. Here, we investigate the spin excitations in bulk and monolayer FeSe/STO using resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations. Despite the absence of long-range magnetic order, bulk FeSe displays dispersive magnetic excitations reminiscent of other Fe-pnictides. Conversely, the spin excitations in FeSe/STO are gapped, dispersionless, and significantly hardened relative to its bulk counterpart. By comparing our RIXS results with simulations of a bilayer Hubbard model, we connect the evolution of the spin excitations to the Fermiology of the two systems revealing a remarkable reconfiguration of spin excitations in FeSe/STO, essential to understand the role of spin fluctuations in the pairing mechanism.

scholarly journals Renormalization of spin excitations and Kondo effect in open-shell nanographenes

2021 ◽  
Vol 104 (7) ◽  
Author(s):  
David Jacob ◽  
Ricardo Ortiz ◽  
Joaquín Fernández-Rossier
Keyword(s):  
Kondo Effect ◽  
Open Shell ◽  
Spin Excitations

scholarly journals Dynamical spin susceptibility in La2CuO4 studied by resonant inelastic x-ray scattering

2021 ◽  
Vol 103 (22) ◽  
Author(s):  
H. C. Robarts ◽  
M. García-Fernández ◽  
J. Li ◽  
A. Nag ◽  
A. C. Walters ◽  
...  
Keyword(s):  
Spin Susceptibility ◽  
X Ray ◽  
X Ray Scattering ◽  
Dynamical Spin ◽  
Ray Scattering

scholarly journals Dynamical spin correlations of the kagome antiferromagnet

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
P. Prelovšek ◽  
M. Gomilšek ◽  
T. Arh ◽  
A. Zorko
Keyword(s):  
Spin Correlations ◽  
Dynamical Spin

scholarly journals ELECTROMAGNETIC INTERACTION OF ANYONS IN NONRELATIVISTIC QUANTUM FIELD THEORY

1994 ◽  
Vol 09 (06) ◽  
pp. 953-967 ◽  
Author(s):  
J. L. CORTÉS ◽  
J. GAMBOA ◽  
L. VELÁZQUEZ
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Interaction ◽  
Magnetic Coupling ◽  
Nonrelativistic Limit ◽  
Quantum Field ◽  
Nonrelativistic Quantum ◽  
Statistical Field ◽  
Mechanical Formulation ◽  
Dynamical Spin ◽  
Chern Simons

The nonrelativistic quantum-field-theoretic Lagrangian which describes an anyon system in the presence of an electromagnetic field is identified. A nonminimal magnetic coupling to the Chern–Simons statistical field as well as to the electromagnetic field together with a direct coupling between both fields are the nontrivial ingredients of the Lagrangian obtained from the nonrelativistic limit of the fermionic relativistic formulation. The results, an electromagnetic gyromagnetic ratio 2 for any spin together with a nontrivial dynamical spin-dependent contact interaction between anyons as well as the spin dependence of the electromagnetic effective action, agree with the quantum-mechanical formulation.

scholarly journals Spin excitations in the skyrmion hostCu2OSeO3

2016 ◽  
Vol 93 (5) ◽  
Author(s):  
G. S. Tucker ◽  
J. S. White ◽  
J. Romhányi ◽  
D. Szaller ◽  
I. Kézsmárki ◽  
...  
Keyword(s):  
Spin Excitations
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