scholarly journals Dimensional crossover in a spin-liquid-to-helimagnet quantum phase transition

2009 ◽  
Vol 79 (6) ◽  
Author(s):  
V. O. Garlea ◽  
A. Zheludev ◽  
K. Habicht ◽  
M. Meissner ◽  
B. Grenier ◽  
...  
Keyword(s):  
Phase Transition ◽  
Quantum Phase Transition ◽  
Quantum Phase ◽  
Spin Liquid ◽  
Dimensional Crossover

scholarly journals Identifying spinon excitations from dynamic structure factor of spin-1/2 Heisenberg antiferromagnet on the Kagome lattice

2019 ◽  
Vol 116 (12) ◽  
pp. 5437-5441 ◽  
Author(s):  
W. Zhu ◽  
Shou-shu Gong ◽  
D. N. Sheng
Keyword(s):  
Phase Transition ◽  
Quantum Phase Transition ◽  
Ground State ◽  
Structure Factor ◽  
Inelastic Neutron Scattering ◽  
Quantum Spin ◽  
Frequency Region ◽  
Quantum Phase ◽  
Spin Liquid ◽  
Magnetically Ordered

A spin-1/2lattice Heisenberg Kagome antiferromagnet (KAFM) is a prototypical frustrated quantum magnet, which exhibits exotic quantum spin liquids that evade long-range magnetic order due to the interplay between quantum fluctuation and geometric frustration. So far, the main focus has remained on the ground-state properties; however, the theoretical consensus regarding the magnetic excitations is limited. Here, we study the dynamic spin structure factor (DSSF) of the KAFM by means of the density matrix renormalization group. By comparison with the well-defined magnetically ordered state and the chiral spin liquid sitting nearby in the phase diagram, the KAFM with nearest neighbor interactions shows distinct dynamical responses. The DSSF displays important spectral intensity predominantly in the low-frequency region around theQ=Mpoint in momentum space and shows a broad spectral distribution in the high-frequency region for momenta along the boundary of the extended Brillouin zone. The excitation continuum identified from momentum- and energy-resolved DSSF signals emergent spinons carrying fractional quantum numbers. These results capture the main observations in the inelastic neutron scattering measurements of herbertsmithite and indicate the spin liquid nature of the ground state. By tracking the DSSF across quantum-phase transition between the chiral spin liquid and the magnetically ordered phase, we identify the condensation of two-spinon bound state driving the quantum-phase transition.

scholarly journals Reply to “Comment on ‘Quantum phase transition in the four-spin exchange antiferromagnet’ ”

2010 ◽  
Vol 82 (13) ◽  
Author(s):  
Valeri N. Kotov ◽  
D. X. Yao ◽  
A. H. Castro Neto ◽  
D. K. Campbell
Keyword(s):  
Phase Transition ◽  
Quantum Phase Transition ◽  
Spin Exchange ◽  
Quantum Phase
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