- #1
Abigale
- 56
- 0
Hi guys,
I consider fermionic holes and I know the creation and annihilation operators of them.
I have shown that [itex]\vec{S}= \sum\limits_{k \nu \mu} \frac{1}{2} \bf{c}_{k \mu}^{\dagger} \vec{\sigma}_{\mu \nu} \bf{c}_{k \nu} =...= \sum\limits_{k \nu \mu} \frac{1}{2} \bf{h}_{-k \mu}^{\dagger} \vec{\sigma}_{\mu \nu} \bf{h}_{ -k \nu}^{ }[/itex].
But I have to show that [itex]\vec{S}=\sum\limits_{k \nu \mu} \frac{1}{2} \bf{h}_{k \mu}^{\dagger} \vec{\sigma}_{\mu \nu} \bf{h}_{ k \nu}^{ }[/itex].
It would be nice if somebody has an idea how I can get rid of the minus sign.
THX
AbbyIs the sum maybe from minus infinity to plus infinity? Then I think I got it.
I consider fermionic holes and I know the creation and annihilation operators of them.
I have shown that [itex]\vec{S}= \sum\limits_{k \nu \mu} \frac{1}{2} \bf{c}_{k \mu}^{\dagger} \vec{\sigma}_{\mu \nu} \bf{c}_{k \nu} =...= \sum\limits_{k \nu \mu} \frac{1}{2} \bf{h}_{-k \mu}^{\dagger} \vec{\sigma}_{\mu \nu} \bf{h}_{ -k \nu}^{ }[/itex].
But I have to show that [itex]\vec{S}=\sum\limits_{k \nu \mu} \frac{1}{2} \bf{h}_{k \mu}^{\dagger} \vec{\sigma}_{\mu \nu} \bf{h}_{ k \nu}^{ }[/itex].
It would be nice if somebody has an idea how I can get rid of the minus sign.
THX
AbbyIs the sum maybe from minus infinity to plus infinity? Then I think I got it.
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