Current Control in Soft-Wall Electron Billiards: Energy-Persistent Scattering in the Deep Quantum Regime

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• 刊名：Lecture Notes in Physics
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：927
• 期：1
• 页码：173-191
• 全文大小：1,874 KB
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• 作者单位：Christian V. Morfonios (18)
  Peter Schmelcher (18)
  
  18. Center for Optical Quantum Technologies, University of Hamburg, Hamburg, Germany
  
• 丛书名：Control of Magnetotransport in Quantum Billiards
• ISBN：978-3-319-39833-4
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mathematical Methods in Physics
  Mathematical and Computational Physics
  Astronomy, Astrophysics and Cosmology
  Atoms, Molecules, Clusters and Plasmas
  Relativity and Cosmology
  Extraterrestrial Physics and Space Sciences
  Condensed Matter
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1616-6361
• 卷排序：927

文摘

In this chapter we use ‘soft-wall’ boundary confinement, that is, a potential profile with finite slope, to induce charge current controllability in a two-terminal transport setup. In particular, the isolation of energetically persistent scattering pathways from the resonant manifold of an elongated electron billiard in the deep quantum regime is demonstrated. This in turn enables efficient conductance switching at varying temperature and Fermi velocity , using a weak magnetic field. The effect relies on the interplay between the elongated soft-wall confinement and magnetic focusing , which together rescale the scattering pathways and decouple quasi-bound states from the attached leads. The mechanism proves robust against billiard shape variations and qualifies as a nanoelectronic current control element. Excerpts and figures from Morfonios and Schmelcher (Phys. Rev. Lett. 113(8):086802, 2014) reprinted with permission. Copyright (2014) by the American Physical Society.