Effective mass Definition and 60 Threads

  1. S

    Why Are Bandgap and Electron Effective Mass Proportional in Semiconductors?

    Hello- I feel that this is a "graduate-level" question, so I hope that this question is not found to be insultingly easy. Can someone help me gain an understanding of why bandgap and electron effective mass in semiconductors are proportional to one another (e.g. trend of C, Si, Ge...
  2. S

    Effect of Effective Mass on Material Band Structure

    Hallo ... I would like to know about the effect of the effective mass on the band structre of the materails..
  3. P

    Effective Mass & Its Effects on Crystalline Structures

    what is effective mass? and how does it effect both the electrical and optical properties of a crystaline structure?
  4. A

    When do we use notion of effective mass

    If effective mass in schrodinger equation takes into account for coupling by other bands or so to say by other electrons, and in this way we don't care about effect of other electrons and deal with lattice potential.
  5. WolfOfTheSteps

    What Are These Energy Band Graphs Actually Showing?

    Homework Statement Here is the problem: http://img413.imageshack.us/img413/748/64my8.th.jpg The Attempt at a Solution I got the effective mass. That's trivial. My question is, what are these graphs actually of? The horizontal and vertical axes are not labeled. Is it an energy...
  6. B

    How Do Ashcroft and Mermin Derive the Cyclotron Effective Mass Expression?

    could anyone elucidate on how Ashcroft and Mermin get \sqrt{\frac{det M}{M_{zz}}} for the cyclotron effective mass (page 571)? Is this true for all energy contours or only certain ones? And if that's the case which because they don't seem to specify? thanks.
  7. Q

    Understanding Effective Mass of Holes in GaAs/AlGaAs Quantum Wells

    Hello, I am a junior undergrad taking an advanced senior/1st yr grad lab. I've been having some difficulty with a few points in the lab materials we were given (we are analyzing the reflectance spectra for GaAs/AlGaAs quantum wells). We were given the effective mass of the electrons, heavy and...
  8. T

    Understanding Effective Mass in Solid State Physics

    Can anyone explains the concept of effective mass in solid state physics to me? Thanks a lot~:smile:
  9. R

    Calculating Effective Mass for a Free Electron: Homework Solution and Equations

    Homework Statement Calculate the effective mass for a free electron. Homework Equations The Attempt at a Solution I know the above equation comes from, in the case of the free electron dispersion relation, . However I'm not at all sure how to go about calculating it for a...
  10. R

    Is there a resource for the effective mass of electrons in common metals?

    Does anyone have a link or reference to a table on the effective mass of electrons in the common metals? thanks