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arXiv · 0806.1576

Tunable 0.7 conductance plateau in quantum dots

Yunchul Chung·Sanghyun Jo·Dong-In Chang·Hu-Jong Lee·M. Zaffalon·V. Umansky·M. Heiblum
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Abstract

A consistent approach in forming the 0.7 structure by using a quantum dot rather than a quantum point contact is demonstrated. With this scheme, it was possible to tune on and off the 0.7 structure. The 0.7 structure continuously evolved into a normal integer conductance plateau by varying the tuning condition. Unlike the conventional 0.7 plateau, the new 0.7 structure was observed even at low electron temperatures down to 100 mK, with unprecedented flatness. From our results, it is concluded that electron interference should be taken into consideration to explain the 0.7 structure.

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Yunchul Chung, Sanghyun Jo, Dong-In Chang, Hu-Jong Lee, M. Zaffalon, V. Umansky, M. Heiblum. 2008-06-10. Tunable 0.7 conductance plateau in quantum dots. https://doi.org/10.1103/physrevb.76.035316

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