Orbital Magnetization Measurement of the Quantum Hall to Insulator Transition

Details Orbital Magnetization Measurement of the Quantum Hall to Insulator Transition Orbital Magnetization Measurement of the Quantum Hall to Insulator Transition

2003-09-03

arxiv.org/abs/cond-mat/0309087v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 4 figures

Scientific paper

We present a magnetization measurement probing the transition from a quantum Hall to insulating (QH-I) state for a two-dimensional electron gas in a disordered GaAs/AlGaAs heterostructure. Using a highly sensitive DC torque magnetometer, we discover an abrupt change in the orbital magnetization precisely at the critical point for the QH-I transition. Since this transition is predicted to be a second order quantum phase transition, a thermodynamic signature in magnetization is totally unexpected. The observed feature is reminiscent of the well-known de Haas-van Alphen oscillations arising from discontinuous jumps of the chemical potential as Landau Levels are successively populated.

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