Effect on conductance of an isomer state in a quantum point contact

P. E. Lindelof

doi:10.1117/12.425474

10 April 2001 Effect on conductance of an isomer state in a quantum point contact

P. E. Lindelof

Proceedings Volume 4415, Optical Organic and Inorganic Materials; (2001) https://doi.org/10.1117/12.425474
Event: Advanced Optical Materials and Devices, 2000, Vilnius, United States

Abstract

We describe a novel phenomenological model for transmission through an adiabatic 1-dimensional constriction, where the electronic configuration around the middle of a quantum point contact can be in two configurations: the usual ground state with spin neutrality (S equals 0) and a higher (virtual) isomer with an uncompensated electronic spin (S equals 1/2), which modifies the conductance at higher temperatures, where it is thermally populated, giving rise to the so-called 0.7 structure. Bias spectroscopy reveals the energy difference between the two isomers. The isomer reflects the charge/spin separation in the middle of the constriction. The high energy isomer is a spin 1/2 state (but not magnetically ordered), and will not directly contribute to the transmission unless temperature is high or biasing allow a Kondo-like resonant transmission. The resonant transmission represents a reduction in conduction from the fully quantized value, 2e²/h.

Citation Download Citation

P. E. Lindelof "Effect on conductance of an isomer state in a quantum point contact", Proc. SPIE 4415, Optical Organic and Inorganic Materials, (10 April 2001); https://doi.org/10.1117/12.425474

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