Interplay of Quantum and Classical Fluctuations Near Quantum Critical Points

摘要: For a system near quantum critical point (QCP), above its lower dimension dL, there is in general line of second-order phase transitions that separates the broken symmetry at finite temperatures from disordered phase. The along this are governed by thermal exponents different those associated with point. We out that, if effective QCP, deff = d + z (d Euclidean and dynamic exponent) upper \(d_{_{C}}\) an intermingle classical (thermal) fluctuations QCP. This due to breakdown generalized scaling relation ψ νz between shift exponent crossover νz, for \(d+z>d_{_{C}}\) dangerous irrelevant interaction. phenomenon has clear experimental consequences, like suppression amplitude temperature as reduced approaching