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and dependences of the device . The inset shows the layout of the device with its constriction and contacts.
A schematic diagram showing how steps appear in at voltage intervals of . Here, is the voltage drop across the constriction, and is the small additional voltage generated close to the end of the constriction due to space-charge build-up.
Magnetic field dependence of . The upper inset shows the ballistic motion in the presence of crossed electric and magnetic fields of a typical hole entering the middle of the constriction. The right-hand inset shows the quenching of the amplitude of the first LO-phonon peak in in more detail. Curves are offset along the vertical axis for clarity.
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