Abstract
We create laterally large and low-disorder GaAs quantum-well-based quantum dots that act as small two-dimensional electron systems. We monitor tunneling of single electrons to the dots by means of capacitance measurements and identify single-electron capacitance peaks in the addition spectrum from occupancies of one up to thousands of electrons. The data show two remarkable phenomena in the Landau level filling factor range ν=2 to ν=5 in selective probing of the edge states of the dot: (i) Coulomb blockade peaks arise from the entrance of two electrons rather than one; (ii) at and near ν=5/2 and at fixed gate voltage, these double-height peaks appear uniformly in a magnetic field with a flux periodicity of h/2e, but they group into pairs at other filling factors.
Original language | English (US) |
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Article number | 256802 |
Journal | Physical review letters |
Volume | 126 |
Issue number | 25 |
DOIs | |
State | Published - Jun 25 2021 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy