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  1. Benevito

    Conduction and valence bands in semiconductors

    For example, here https://www3.nd.edu/~djena/kdotp.pdf [Broken] it is stated that "For direct-gap semiconductors, for states near the conduction-band minimum (k = 0), the Bloch lattice-function possesses the same symmetry properties as a |S> state . In other words, it has spherical symmetry. The...
  2. Benevito

    Conduction and valence bands in semiconductors

    Why is the conduction band state s-type and the corresponding valence band state p-type?
  3. Benevito

    Neutral and charged exitons (trions)

    Thank you for clarification. Another question - how can we distinguish between positively and negatively charged exitons?
  4. Benevito

    Neutral and charged exitons (trions)

    How can we distinguish between neutral and charged exitons?
  5. Benevito

    Dielectric constant in few-layer and in bulk materials

    Why is the dielectric constant smaller in few-layer materials than in bulk materials?
  6. Benevito

    Photoluminescence at a heterojunction

    Do I understand it correctly that photoluminescence at a semiconductor heterojunction occurs because of intralayer recombination? If so, why can't photoluminescence occur because of interlayer recombination? Is it because momentum cannot be conserved in such a process ( like in the indirect gap...
  7. Benevito

    Current and Quantum Hall Effect

    Why does the presence of an energy gap in QHE guarantee dissipationless current flow?
  8. Benevito

    Valley degrees of freedom

    As a local minimum/maximum on the valence/conduction band in semiconductors.
  9. Benevito

    Valley degrees of freedom

    Could someone please explain what valley degrees of freedom are?
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