Abstract
We have studied quantum transports in two dimensional electron gas (2DEG) numerically, where magnetic fields with sine-type modulation are applied perpendicular to the plane of 2DEG. Due to the non-homogeneous magnetic fields, the system becomes chaotic. We use tight-binding model and investigate the energy level statistics and the two terminal conductance. Depending on the spatial symmetry of the magnetic fields, the system belongs to the unitary class or the orthogonal, which is reflected by the energy level statistics. Attaching leads further destroys the symmetry, and the universal conductance fluctuation for the unitary class is observed. The fractal behavior of the magnetoconductance is also observed.
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