IBM Journal of Research and Development
IBM Skip to main content
  Home     Products & services     Support & downloads     My account  

  Select a country  
Journals Home  
  Systems Journal  
Journal of Research
and Development
    Current Issue  
    Recent Issues  
    Papers in Progress  
    Search/Index  
    Orders  
    Description  
    Patents  
    Recent publications  
    Author's Guide  
  Staff  
  Contact Us  
  Related links:  
     IBM Research  

IBM Journal of Research and Development  
Volume 32, Number 1, Page 63 (1988)
Basic Concepts in Quantum and Stochastic T...
  Full article: arrowPDF   arrowCopyright info





   

Coherent and sequential tunneling in series barriers

by M. Buttiker
A simple approach which can describe both coherent tunneling and sequential tunneling is applied to resonant tunneling through a double-barrier structure. This approach models phase-randomizing events by connecting to the conductor a side branch leading away from the conductor to a reservoir. The reservoir does not draw or supply a net current, but permits inelastic events and phase randomization. A conductance formula is obtained which contains contributions due to both coherent and sequential tunneling. We discuss the limiting regimes of completely coherent tunneling and completely incoherent transmission, and discuss the continuous transition between the two. Over a wide range of inelastic scattering times tunneling is sequential. The effect of inelastic events on the peak-to-valley ratio and the density of states in the resonant well is investigated. We also present an analytic discussion of the maximum peak conductance e/h of an isolated resonance in a many-channel conductor.
Related Subjects: Carrier transport in small structures; Mesoscopic phenomena; Physics, solid state; Quantum theory and effects