Good review of point contacts in 2DEG?

In summary, the speaker is looking for a book or review article about point contacts in AlGaAs/GaAs 2DEG, both quantum and non-quantized versions. They are specifically interested in the transport properties at microwave frequencies and are hoping to find information that can be used to create simplified circuit models. Some suggested sources include R. R. Du at Rice University and Lloyd Engel and Dan Tsui at the Magnet Lab and Princeton, who have both conducted microwave measurements on GaAs/AlGaAs 2DEGs."
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f95toli
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As the title says, does anyone know of a good book or review article about point contacts (both quantum and "classical" non-quantized version) in AlGaAs/GaAs 2DEG?
I am trying to find some information about their transport properties at MW frequencies (a few GHz), specifically information that can be used to create simplified lumped-element circuit models.
 
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  • #2
I can't name any reviews, but a few groups come to mind - R. R. Du (Rice U) and Lloyd Engel + Dan Tsui (Magnet Lab + Princeton). You might want to see if they have any recent reviews or papers on the field. I'm not sure if either team has worked specifically with QPCs, but I know they both have done a number of microwave measurements on GaAs/AlGaAs 2DEGs.
 
  • #3


There are several good resources available for studying point contacts in 2DEG systems. One of the most comprehensive books on this topic is "Point Contacts in Semiconductor Nanostructures" by Alexey A. Kiselev, which covers both classical and quantum point contacts in detail. Additionally, the book "Transport in Nanostructures" by David K. Ferry and Stephen M. Goodnick also provides a thorough overview of point contacts in 2DEG systems, including their transport properties at microwave frequencies.

In terms of review articles, there are several published in the past few years that may be of interest to you. "Point contacts in two-dimensional electron gases: A review" by P. H. Beton and J. C. Portal provides a comprehensive overview of the theory and experimental techniques for studying point contacts in 2DEG systems. Another useful review article is "Transport properties of point contacts in two-dimensional electron gases" by P. J. Burke, which discusses the various transport mechanisms and models for point contacts in 2DEG systems.

Overall, these resources should provide you with the necessary information to create simplified lumped-element circuit models for point contacts in AlGaAs/GaAs 2DEG systems at microwave frequencies. It is also worth considering consulting with experts in the field for further guidance and insights.
 

1. What is a point contact in a 2DEG?

A point contact in a 2DEG (two-dimensional electron gas) refers to a localized region where the electron density is significantly higher compared to the surrounding area. This can be achieved by applying a potential barrier or using a sharp tip to locally deplete the electron density in the 2DEG.

2. Why is a good review of point contacts in 2DEG important?

A good review of point contacts in 2DEG is important because it provides a comprehensive understanding of the properties and behavior of these structures. This can aid in the development of new technologies and devices that utilize 2DEG, such as transistors and sensors.

3. What are the main techniques used to study point contacts in 2DEG?

The main techniques used to study point contacts in 2DEG include scanning probe microscopy, transport measurements, and theoretical modeling. Scanning probe microscopy allows for the imaging and manipulation of individual point contacts, while transport measurements provide information on the electrical properties. Theoretical modeling helps to understand the underlying physics and predict the behavior of point contacts.

4. How do point contacts in 2DEG differ from traditional electrical contacts?

Point contacts in 2DEG differ from traditional electrical contacts in that they are highly localized and can exhibit unique electronic properties, such as quantization and tunneling effects. In contrast, traditional electrical contacts are typically larger and more uniform in their electron density distribution.

5. What are some potential applications of point contacts in 2DEG?

Point contacts in 2DEG have potential applications in nanoelectronics, quantum computing, and spintronics. They can also be used as sensitive probes for studying the properties of 2DEG and other materials at the nanoscale. Additionally, point contacts in 2DEG can be utilized in sensors for detecting small changes in the local electron density.

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