Quantum Hall Effect: True microscopic picture and tuning its edge regime

Speaker: 
Mr Rostyslav Savytskyy
From: 
CQC2T at UNSW
When: 
4pm Thursday 26 April 2018
Where: 
CQC2T Conference Room, Level 2, Newton Building J12, UNSW Kensington Campus

The Quantum Hall Effect (QHE) was discovered in 1980 and many works have been published since then related to the Physics of this phenomenon. However, there still exists misconception about its microscopic picture in the form of the dissipationless 1D current-carrying edge-states. Thus, I will present scanning probe microscopy measurements conducted at the von Klitzing department (MPI Stuttgart), which have demonstrated the actual current distribution inside the Hall sample during QH plateau [1]. In addition, I will show how modification of the electron profile in the 2DES affects observation of the QHE, providing new insight into it and additional confirmation of its microscopic picture.
[1] Weis J. & von Klitzing K. Phil. Trans. R. Soc. A 369, 3954 (2011)