2001/03/31 by Denis Dalidovich, Philip Phillips
Physics and Astronomy · #Atomic and Subatomic Physics Research #Coherence length #Condensed matter physics #Cooper pair #Electrical resistivity and conductivity #Magnetic field #Magnetoresistance #Metal–insulator transition #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum critical point #Quantum mechanics #Quantum phase transition #Superconductivity #Vortex #cond-mat
paper · pdf · doi:10.1103/physrevb.64.184511
published as Phys. Rev. B vol. 64, 184511/1-4 (2001). · 5 pages, 3 .eps figures, submitted to PRB
arxiv created 2001/05/29 · openalex publication_date 2001/10/19 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We analyze here the behavior near the two-dimensional insulator-superconductor quantum critical point in the presence of a perpendicular magnetic field. We show that with increasing field H, the quantum disordered and quantum critical regimes, in which vortex degrees of freedom are suppressed, crossover to a new magnetically activated (MA) regime, where the correlation length \ensuremathξ\ensuremath∼1/√(H). In this regime, we show that the conductivity decreases monotonically as opposed to the anticipated saturation predicted from hyperuniversality arguments. This discrepancy arises from the lack of commutativity of the frequency and temperature tending to zero limits of the conductivity. In the low-field regime such that √(H)\ensuremath≪\ensuremathΔ, and in the absence of Ohmic dissipation, where \ensuremathΔ is a measure of the distance from the quantum critical point, the resistivity saturates to the Bose metal value found previously for Cooper pairs lacking phase coherence.