The electron gas screening on Coulomb potential can be weakened greatly when Landaulevel filling factor is an even number.
当填充因子为偶数时，其本征能量的绝对值最大，此时电子气对库仑势的屏蔽效应最弱。
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We also studied backward Compton scattering in the accelerator magnetic field, and explored possible effect of space noncommutativity caused by the lowest Landaulevel.