Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-08-02
Brazilian Journal of Physics, Vol. 41, Numbers 2-3, 201-211 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 6 figures, to be published in Brazilian Journal of Physics
Scientific paper
10.1007/s13538-011-0025-2
For a system near a quantum critical point (QCP), above its lower critical dimension $d_L$, there is in general a critical line of second order phase transitions that separates the broken symmetry phase at finite temperatures from the disordered phase. The phase transitions along this line are governed by thermal critical exponents that are different from those associated with the quantum critical point. We point out that, if the effective dimension of the QCP, $d_{eff}=d+z$ ($d$ is the Euclidean dimension of the system and $z$ the dynamic quantum critical exponent) is above its upper critical dimension $d_C$, there is an intermingle of classical (thermal) and quantum critical fluctuations near the QCP. This is due to the breakdown of the generalized scaling relation $\psi=\nu z$ between the shift exponent $\psi$ of the critical line and the crossover exponent $\nu z$, for $d+z>d_C$ by a \textit{dangerous irrelevant interaction}. This phenomenon has clear experimental consequences, like the suppression of the amplitude of classical critical fluctuations near the line of finite temperature phase transitions as the critical temperature is reduced approaching the QCP.
No associations
LandOfFree
Interplay of quantum and classical fluctuations near quantum critical points does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Interplay of quantum and classical fluctuations near quantum critical points, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interplay of quantum and classical fluctuations near quantum critical points will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-510582