Conductance Fluctuations and Spin Symmetries in Quantum Dots
  Conductance fluctuations in GaAs quantum dots with spin-orbit and Zeeman coupling are investigated experimentally and compared to a random matrix theory formulation that defines a number of regimes of spin symmetry depending on experimental parameters. Accounting for orbital coupling of the in-plane magnetic field, which can break time-reversal symmetry, yields excellent overall agreement between experiment and theory. 
D. M. Zumbuhl, J. B. Miller, D. Goldhaber-Gordon, C. M. Marcus, J. S.   Harris, Jr., K. Campman, A. C. Gossard