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Localized Energy States and Fermi Level


Localized Energy States and Fermi Level

Logo for Localized Energy States and Fermi Level
""...shows the Fermi function at a given termperature T.""
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Material Type: Simulation
Technical Format: Java Applet
CAUTION: Java Applets may not run on all browsers
Date Added to MERLOT: April 29, 1997
Date Modified in MERLOT: June 02, 2008
Submitter: John Lilly


  • Peer review 4 rating
    Peer Reviews: 4 rating
  • User review 4.33 average rating
  • User Rating: 4.33 user rating
  • Discussion (3 Comments)
  • Learning Exercises (none)
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Primary Audience: College General Ed
Mobile Compatibility: Not specified at this time
Language: English
Cost Involved: no
Source Code Available: no
Accessibility Information Available: no
Creative Commons: unsure


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Discussion for Localized Energy States and Fermi Level

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Avatar for Barbra Bied Sperling
15 years ago

Barbra Bied Sperling (Staff)

I spent about 30 minutes working with the applet and reading the
accompanying textual material. The applet gives a good qualitative sense of the
Fermi level and temperature effects on the occupation of energy states. The
supplementary material is very good. The applet is simple to use and serves its
purpose. It could be used as tutorial or as a lecture/demo. The supplementary
material provides a clear mathematical analysis of the occupation of energy
states and a worksheet for students to check their understanding. In addition,
the reference section gives links to many other sources that will be of interest
to students seeking more information.

Technical Remarks:

I occasionally had problems bringing up a couple of the supplementary textual
pages using Netscape 4.76, but no problems with IE 5.5.

Avatar for Chris Wolowiec
15 years ago

Chris Wolowiec (Student)

This Physlet offers a clear and concise presentation of how electron
distribution depends on the two different parameters of temperature and Fermi
energy level. The user may interact with the physlet by varying temperature for
a given Fermi energy level and vice versa. By doing so the user may witness how
the two different parameters have different effects on the distribution of
electrons. The presentation, however, is somewhat stark in that it lacks
context. Specifically, it seems almost necessary in an introductory discussion
of Fermi statistics to briefly talk about the Boltzman and Bose-Einstein
distributions, how they describe the behavior of particles other than electrons
and how they compare with the electron distribution. In short this tutorial
provides a clear yet brief introduction to Fermi statistics and how it explains
the behavior of electrons in a solid.

Technical Remarks:

It takes about an hour to hit every page of this physlet and do some of the
calculations reqired in moving through the tutorial. A calculator at your side
will help with the calculations. There is also a page designated for a quiz,
however I could not find the quiz anywhere in the tutorial.

Avatar for John Walkup
16 years ago

John Walkup (Staff)

Very nice display of the Fermi level. Those taking an introductory course in solid state will appreciate this site. Applet worked fine. Accompanying explanations (which include
problem sets) are first rate.