Measurement and analysis of telegraph noise in the acoustoelectric current of shallow-etched quantum point device
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ORIGINAL PAPER
Measurement and analysis of telegraph noise in the acoustoelectric current of shallow-etched quantum point device X F Zhao1, C Y Zhang1*, L J Tang2, J G Du3, X Li1 and M Yan1 1
College of Geophysics, Chengdu University of Technology, Chengdu 610059, China 2
Yantai Institute, China Agricultural University, Yantai 264670, China
3
College of Physical Science and Technology, Sichuan University, Chengdu 610064, China Received: 07 August 2018 / Accepted: 09 July 2019
Abstract: We report on measurements and analysis of telegraph noise of acoustoelectric current induced the surface acoustic waves-based single-electron-transport devices at 1.7 K. Trapping and detrapping electrons in the defect are considered as the physical origin of random telegraph noise. A theoretical model is designed by regarding the impurity potential as the coulomb potential of point charge. And the transitions of different metastable states in the course of measuring current could be well explained by this simplified model. Furthermore, our experimental data indicate that the current noises gradually decrease and finally vanish with the increase of radio frequency (RF) power. Therefore, the RF power in the interdigital transducer could well modulate the amplitude of telegraph noise. Keywords: Electronic transport; Acoustoelectric current; Random telegraph noise; Impurity potential PACS No.: 73.23.–b; 77.65.Dq; 42.50.Lc; 71.55.Eq
1. Introduction Surface acoustic waves (SAW) traveling on a GaAs/AlxGa1-xAs heterostructure in quasi-two-dimensional electron systems (2DES) are one of the research hot spot in recent years. Particularly, a series of moving quantum dots (QDs) formatted between surface acoustic waves and piezoelectric potential could trap and transfer a fixed number of electrons through a closed one-dimensional channel fabricated by an etching or a split gate technology leading to a quantized acoustoelectric (AE) current [1–6]. The quantized acoustoelectric current (I = nef) provides a way to achieve the quantized current standard, where f represents the SAW frequency, e is an electron charge, while n is the electron number transferred through the channel during SAW period. For the utility in metrological applications, a future current standard is required to deliver current in the nanoampere range with a relative uncertainty smaller than 10-8.
*Corresponding author, E-mail: [email protected]
Unfortunately, the fluctuations of AE current were easy to be observed in the previous and our experimental process, which seriously restricts the application of SAWbased single-electron-transport (SAWSET) device in metrology [7–10]. The current fluctuations obtain obvious characteristics of random telegraph noise (RTN), which could lead to a random switching of device characteristics [11]. However, a large number of reports have only focused on the conductance fluctuations in the opened quasi-one-dimensional channel regime [12, 13]. Then, the researchers put forward some physical mechanisms in order to explore the c
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