Physics of the Solid State
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Features of microwave photoconductance of quantum point contact
Kuzmin N. S.
1,2, Jaroshevich A. S.
1, Kvon Z.D.
1,2, Tkachenko V. A.1,2, Bakarov A. K.
1, Rodyakina E. E.1,2
1Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Email: ethanq95@gmail.com, jarosh@isp.nsc.ru, kvon@isp.nsc.ru, vtkach@isp.nsc.ru, bakarov@isp.nsc.ru, rodyakina@isp.nsc.ru
Microwave photoconductance of a quantum point contact has been experimentally studied in both tunnel and open modes. It demonstrates a range of features such as change of sign during the transition from the tunnel to the open mode, display of a step structure, and varying width of the giant photoconductance region. Occurrence of the features is determined by specific implementation of the electrostatic potential, which depends both on the technologically specified structure of the grown quantum wells with two-dimensional electron gas and on the sample cooling procedure. Keywords: nanostructures, two-dimensional electron gas, quantum point contact, photoconductance.
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