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We show that nanoscale doping profiles inside a nanocolumn in combinationwith Fermi-level pinning at the surface give rise to the formation of asaddle-point in the potential profile. Consequently, the lateral confinementinside the channel varies along the transport direction, yielding an embeddedquantum point contact. An analytical estimation of the quantization energieswill be given

Quantum point contact due to Fermi-level pinning and doping profiles in semiconductor nanocolumns