scholarly journals Order parameter for the multichannel Kondo model at quantum criticality

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Ru Zheng ◽  
Rong-Qiang He ◽  
Zhong-Yi Lu
Keyword(s):  
Order Parameter ◽  
Quantum Criticality ◽  
Kondo Model

scholarly journals Quantum criticality out of equilibrium in the pseudogap Kondo model

2012 ◽  
Vol 85 (19) ◽  
Author(s):  
Chung-Hou Chung ◽  
Kenneth Yi-Jie Zhang
Keyword(s):  
Quantum Criticality ◽  
Kondo Model

scholarly journals An order parameter for impurity systems at quantum criticality

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Abolfazl Bayat ◽  
Henrik Johannesson ◽  
Sougato Bose ◽  
Pasquale Sodano
Keyword(s):  
Order Parameter ◽  
Quantum Criticality

scholarly journals Quantum criticality in the spin-isotropic pseudogap Bose-Fermi Kondo model: Entropy, scaling, and the g -theorem

2020 ◽  
Vol 102 (11) ◽  
Author(s):  
Zuodong Yu ◽  
Farzaneh Zamani ◽  
Pedro Ribeiro ◽  
Stefan Kirchner
Keyword(s):  
Quantum Criticality ◽  
Kondo Model

scholarly journals Novel excitations near quantum criticality in geometrically frustrated antiferromagnet CsFeCl3

2019 ◽  
Vol 5 (10) ◽  
pp. eaaw5639 ◽  
Author(s):  
Shohei Hayashida ◽  
Masashige Matsumoto ◽  
Masato Hagihala ◽  
Nobuyuki Kurita ◽  
Hidekazu Tanaka ◽  
...  
Keyword(s):  
Order Parameter ◽  
Critical Pressure ◽  
Quantum Critical Point ◽  
Single Mode ◽  
Wave Theory ◽  
Quantum Criticality ◽  
Geometrically Frustrated ◽  
Amplitude Fluctuations ◽  
Pressure Phase ◽  
Triangular Lattice Antiferromagnet

The investigation of materials that exhibit quantum phase transition provides valuable insights into fundamental problems in physics. We present neutron scattering under pressure in a triangular-lattice antiferromagnet that has a quantum disorder in the low-pressure phase and a noncollinear structure in the high-pressure phase. The neutron spectrum continuously evolves through critical pressure; a single mode in the disordered state becomes soft with the pressure and it splits into gapless and gapped modes in the ordered phase. Extended spin-wave theory reveals that the longitudinal and transverse fluctuations of spins are hybridized in the modes because of noncollinearity, and previously unidentified magnetic excitations are formed. We report a new hybridization of the phase and amplitude fluctuations of the order parameter near a quantum critical point in a spontaneously symmetry-broken state.

scholarly journals Quantum criticality in dimerised anisotropic spin-1 chains

2021 ◽  
Author(s):  
Satoshi Ejima ◽  
Florian Lange ◽  
Holger Fehske
Keyword(s):  
Phase Transition ◽  
Ground State ◽  
Order Parameter ◽  
Central Charge ◽  
Universality Class ◽  
Spin Correlation ◽  
Quantum Criticality ◽  
Ground State Phase Diagram ◽  
Spin Correlation Function ◽  
Theoretical Predictions

AbstractApplying the (infinite) density-matrix renormalisation group technique, we explore the effect of an explicit dimerisation on the ground-state phase diagram of the spin-1 XXZ chain with single-ion anisotropy D. We demonstrate that the Haldane phase between large-D and antiferromagnetic phases survives up to a critical dimerisation only. As a further new characteristic the dimerisation induces a direct continuous Ising quantum phase transition between the large-D and antiferromagnetic phases with central charge $$c=1/2$$ c = 1 / 2 , which terminates at a critical end-point where $$c=7/10$$ c = 7 / 10 . Calculating the critical exponents of the order parameter, neutral gap and spin–spin-correlation function, we find $$\beta =1/8$$ β = 1 / 8 (1/24), $$\nu =1$$ ν = 1 (5/9), and $$\eta =1/4$$ η = 1 / 4 (3/20), respectively, which proves the Ising (tricritical Ising) universality class in accordance with field-theoretical predictions.

EFFECT OF ORDER PARAMETER RELAXATION ON JOSEPHSON JUNCTION TRANSIENTS

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-550-C6-551
Author(s):  
H. Suhl ◽  
J. Hurell ◽  
A. H. Silver ◽  
Y. Song
Keyword(s):  
Josephson Junction ◽  
Order Parameter

NEUTRON INVESTIGATION OF THE SPIN GLASS ORDER PARAMETER FOR T ≪ Tg

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1019-C8-1020
Author(s):  
H. Alloul ◽  
B. Hennion ◽  
P. Mendels
Keyword(s):  
Spin Glass ◽  
Order Parameter
Sign in / Sign up

Export Citation Format

Share Document