Abstract
We present the results of transport measurements in a hybrid system consisting of an arch-shaped quantum point contact (QPC) and a reflector; together, they form an electronic cavity in between them. On tuning the arch-QPC and the reflector, asymmetric resonance peak in resistance is observed at the one-dimension to two-dimension transition. Moreover, a dip in resistance near the pinch-off of the QPC is found to be strongly dependent on the reflector voltage. These two structures fit very well with the Fano line shape. The Fano resonance was found to get weakened on applying a transverse magnetic field, and it smeared out at 100 mT. In addition, the Fano like shape exhibited a strong temperature dependence and gradually smeared out when the temperature was increased from 1.5 to 20 K. The results might be useful in realising device for quantum information processing.
Highlights
Chengyu Yan,1,2,* Sanjeev Kumar,1,2 Michael Pepper,1,2 Patrick See,3 Ian Farrer,4,† David Ritchie,4 Jonathan Griffiths,4 and Geraint Jones4
We present the results of transport measurements in a hybrid system consisting of an arch-shaped quantum point contact (QPC) and a reflector; together, they form an electronic cavity in between them
There have been experimental attempts in the past in coupling an electronic cavity with one-dimensional (1D) electrons using a quantum point contact (QPC) [10,11], in such cases the oscillations in the conductance [12,13,14,15] were primarily due to quantum interference rather than coupling between the 1D-cavity states
Summary
Chengyu Yan,1,2,* Sanjeev Kumar,1,2 Michael Pepper,1,2 Patrick See,3 Ian Farrer,4,† David Ritchie,4 Jonathan Griffiths,4 and Geraint Jones4 We present the results of transport measurements in a hybrid system consisting of an arch-shaped quantum point contact (QPC) and a reflector; together, they form an electronic cavity in between them.
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