Effect of Spatially Varying Potential on Photon-Assisted Tunneling in Quantum Dots.
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- Isawa Yoshimasa
- Department of Physical Electronics, Faculty of Engineering, Hiroshima University, Kagamiyama 1–4–1, Higashihiroshima 739
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- Okamoto Akifumi
- Department of Physical Electronics, Faculty of Engineering, Hiroshima University, Kagamiyama 1–4–1, Higashihiroshima 739
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- Hatano Tsuyoshi
- Department of Physical Electronics, Faculty of Engineering, Hiroshima University, Kagamiyama 1–4–1, Higashihiroshima 739
Bibliographic Information
- Other Title
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- Effect of Spatially Varying Potential o
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Abstract
A formula for photon-assisted tunneling (PAT) in semiconductor quantum dots is derived for a case of low transmission rates through tunneling barriers, by using the generalized perturbation method developed by Keldysh. We describe a new process giving rise to a dc current even in the absence of bias voltage in which the dot is excited uniformly by an ac signal including microwaves, and both the occupied and the unoccupied quantized states participate in the electrical conduction. In addition, the dc current flows through the left and the right barriers via different levels. An electron tunnels into the dot from the barrier in which the higher energy level pumped by absorbing a spatialy uniform ac signal has a higher transfer rate and another one occupied in the lower level tunnels out through the barrier in which the lower energy level has a higher transfer rate.This is in marked contrast to a dc current without bias voltage, which has been explained in terms of the process making use of a single quantized state in an asymmetrically excited quantum dot.In order to open a new channel, it is necessary to prepare a particular level configuration, which is realized, for instance, by spatially varying the potenial.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 66 (1), 11-14, 1997
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204182424704
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- NII Article ID
- 110001977986
- 130004535879
- 210000100040
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- NII Book ID
- AA00704814
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- BIBCODE
- 1997JPSJ...66...11I
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 4131703
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed