growth law of order-parameter fluctuation in a random interface system

1988 ◽  
Vol 38 (16) ◽  
pp. 11904-11906
Author(s):  
Hiroyasu Toyoki
Keyword(s):  
Order Parameter ◽  
Parameter Fluctuation ◽  
Random Interface ◽  
Interface System

scholarly journals Order parameter fluctuation and ordering competition in Ba1−xKxFe2As2

2017 ◽  
Vol 95 (2) ◽  
Author(s):  
Jing Wang ◽  
Guo-Zhu Liu ◽  
Dmitry V. Efremov ◽  
Jeroen van den Brink
Keyword(s):  
Order Parameter ◽  
Parameter Fluctuation

scholarly journals Instabilities of quantum critical metals in the limit $N_f\rightarrow0$

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Petter Säterskog
Keyword(s):  
Fermi Surface ◽  
Long Range ◽  
Charge Density Wave ◽  
Order Parameter ◽  
Finite Interval ◽  
Density Wave ◽  
Parameter Fluctuation ◽  
Critical Metals ◽  
Quantum Critical Points ◽  
Quantum Critical

We study a model in 2+1 dimensions composed of a Fermi surface of N_fNf flavors of fermions coupled to scalar fluctuations near quantum critical points (QCPs). The N_f\rightarrow0Nf→0 limit allows us to non-perturbatively calculate the long-range behavior of fermion correlation functions. We use this to calculate charge, spin and pair susceptibilities near different QCPs at zero and finite temperatures, with zero and finite order parameter gaps. While fluctuations smear out the fermionic quasiparticles, we find QCPs where the overall effect of fluctuations leads to enhanced pairing. We also find QCPs where the fluctuations induce spin and charge density wave instabilities for a finite interval of order parameter fluctuation gaps at T=0T=0. We restore a subset of the diagrams suppressed in the N_f\rightarrow0Nf→0 limit, all diagrams with internal fermion loops with at most 2 vertices, and find that this does not change the long-range behavior of correlators except right at the QCPs.

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