# Tag Info

7

The concept of spin gapless semiconductors (SGS) was proposed in this paper: PRL 100, 156404 (2008). In quantum solid-state band theory, materials in nature are generally classified as insulators, semiconductors, metals, semimetals, and half-metals based on the electronic band structures (density of states or band structure), as shown below. (a): Metal (b)...

6

I don't think we need to talk about driving forces (this sounds esoteric) instead calculating the selection rule: $$P_T = \int \psi_1^* \mu \psi_2 d\tau$$ Here $\psi_1$ and $\psi_2$ are the wavefunctions of the two states involved in the transition and $\mu$ the transition operator. This integral represents the transition probability ($P_T$). When the result ...

5

I think you will be hard pressed to find a definitive answer, however I would say you are within reason to call it a half semiconductor. Just be aware that this doesn't seem to be a well defined term and you may need to give the audience / reader a prompting on what you mean by half semiconductor.

4

For the up-spin channel, you can absolutely consider it as a semiconductor; for the down-spin channel, you can consider it as an insulator (may someone also consider it as a semiconductor, just different conventions). Thus, you can say your material is a half-semiconductor (HSC). (HSC is a semiconductor in one spin channel but an insulator in the other spin ...

4

Whenever I hear spintronics, valleytronics, twistronics or anything that really breaks down to the study of quantum transport, I always think of the people who taught me Quantum Mechanics and work in this field and a code called kwant. While I do not study these topics myself, I used to try to learn related topics and I took a couple workshops since I was ...

3

What are the consequences for a bandgap if the conduction band and valence band are on different spins? The energy band of materials when the spin is involved (magnetic/nonmagnetic) are usually classified as follows: in which : (a): ferromagnetic metals (b): half metals (c): topological insulator (d): half semiconductor (e): spin gapless semiconductor (f):...

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