Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts

Tatsuya Muro; Yoshitaka Nishihara; Shota Norimoto; Meydi Ferrier; Tomonori Arakawa; Kensuke Kobayashi; Thomas Ihn; Clemens Roessler; Klaus Ensslin; Christian Reichl; Werner Wegscheider

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Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts

机译：高迁移率量子点接触中的有限散粒噪声和定量电导的电子加热

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We report a precise experimental study on the shot noise of a quantum point contact (QPC) fabricated in a GaAs/AlGaAs based high-mobility two-dimensional electron gas (2DEG). The combination of unprecedented cleanliness and very high measurement accuracy has enabled us to discuss the Fano factor to characterize the shot noise with a precision of 0.01. We observed that the shot noise at zero magnetic field exhibits a slight enhancement exceeding the single particle theoretical prediction, and that it gradually decreases as a perpendicular magnetic field is applied. We also confirmed that this additional noise completely vanishes in the quantum Hall regime. These phenomena can be explained by the electron heating effect near the QPC, which is suppressed with increasing magnetic field.

机译：我们报告了在基于GaAs / AlGaAs的高迁移率二维电子气（2DEG）中制造的量子点接触（QPC）的散粒噪声的精确实验研究。前所未有的清洁度和极高的测量精度相结合，使我们能够讨论Fano系数，以0.01的精度表征散粒噪声。我们观察到零磁场下的散粒噪声显示出超过单粒子理论预测的轻微增强，并且随着施加垂直磁场而逐渐减小。我们还证实，这种额外的噪声在量子霍尔机制中完全消失了。这些现象可以通过QPC附近的电子加热效应来解释，该效应随着磁场的增加而受到抑制。

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来源
《Physical review》 |2016年第19期|195411.1-195411.7|共7页
作者
Tatsuya Muro; Yoshitaka Nishihara; Shota Norimoto; Meydi Ferrier; Tomonori Arakawa; Kensuke Kobayashi; Thomas Ihn; Clemens Roessler; Klaus Ensslin; Christian Reichl; Werner Wegscheider;
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Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;

Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan,Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan;

Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;

Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan,Laboratoire de Physique des Solides, CNRS, Universite Paris-Sud, Universite Paris Saclay, 91405, Orsay Cedex, France;

Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;

Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;

Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland;

Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland;

Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland;

Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland;

Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland;

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1. Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts [J] . Muro Tatsuya, Nishihara Yoshitaka, Norimoto Shota, Physical review, B . 2016,第19期

机译：高迁移率量子点接触中的有限散粒噪声和定量电导的电子加热
2. Conductance quantization and shot noise of a double-layer quantum point contact [J] . D. Terasawa, S. Norimoto, T. Arakawa, Physical review . 2020,第11期

机译：双层量子点接触的电导量化和散粒噪声
3. Conductance quantization and shot noise of a double-layer quantum point contact [J] . Physical review, B . 2020,第11期

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4. Conductance quantization in schottky-gated Si/SiGe quantum point contacts [C] . G. Scappucci, L. Di Gaspare, E. Giovine, International Conference on the Physics of Semiconductors . 2007

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5. A mechanical perturbation approach to study quantized conductance in atomic point contacts. [D] . Armstrong, Jason N. 2010

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7. Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts [O] . Muro, Tatsuya, Nishihara, Yoshitaka, Norimoto, Shota, 2017

机译：量子电导的有限散粒噪声和电子加热高迁移率量子点接触
8. Magnetic-Field-Induced V-Shaped Quantized Conductance Staircase in a Double-Layer Quantum Point Contact;Physical Review B (Rapid Communication) [R] . Lyo, S. K. 1999

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Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts

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