Instability induced by exchange forces in a 2D electron gas in a magnetic field with uniform gradient
Instability induced by exchange forces in a 2D electron gas in a magnetic field with uniform gradient
The exchange interaction is investigated theoretically for electrons confined to a 2-D sample placed in a linearly varying magnetic field perpendicular to the plane. Unusual and interesting behavior is predicted: starting from zero, as one adds electrons to the system, its size will increase continuously but will then collapse. However …