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Seminars»10.04.2014 - Afif Sıddıki : The local nature of incompressibility in quantised Hall effect regime modified by interactions

10.04.2014 - Afif Sıddıki : The local nature of incompressibility in quantised Hall effect regime modified by interactions

The local nature of incompressibility in quantised Hall effect regime modified by interactions

Afif Sıddıki
Istanbul University, Department of Physics, Istanbul.
10 April 2014, Thursday, 14:40
Cavid Erginsoy Seminar Room, Physics Department, 3rd floor

Abstract: Since the experimental realisation of the integer quantised Hall effect in a two dimensional electron system subject to strong perpendicular magnetic fields in 1980, a central question has been the interrelation between the conductance quantisation and the topological properties of the system. I this talk I will present our experimental findings showing that the close relationship proposed between the quantised Hall effect and the topological bulk insulator is prone to break for specific magnetic field intervals within the plateau evidenced by our magneto-transport measurements performed on GaAs/AlGaAs high purity Hall bars with two inner contacts embedded to bulk. The experimental observations will be discussed within the self-consistent screening theory of the quantised Hall effect.