Recent content by MaestroBach

As a heads up, I'm really sorry but I can never get latex to work when I hit preview on physicsforums for some reason. Haven't been able to figure it out across multiple browsers. So for a bit of context, this question is for the pariser parr pople model applied to something such as a benzene...

I'm reading a textbook and it states the following: For whatever reason latex previewing is not working for me right now.. but the way I was thinking about this was to take the complex conjugate of the entire left, act with the ensuing creation operator on |x_1 ... x_N-1> to get |x_1...x_N>...

Ah, would these also be called the "contacts"?

For context, I have very little background knowledge of circuits. I'm reading about P-N junctions under forward and reverse bias, and I'm having a bit of trouble visualizing what's happening where the P side of the junction meets the circuit under forward bias. From what I understand, at the...

Thank you both!

Thank you very much!

Ah yes, of course- I don't know what I was thinking for a second. I guess where I'm still stuck is that up to now, if I were given just a ket state, I'd be able to look at it and draw some kind of information from just it, without having to do the inner product of it and a bra or integrating...

I do understand that with an inner product we'll always be integrating, but I guess seeing I was only looking at a ket, I didn't think of the integration at all. Wouldn't the integration happen after doing the inner product with a bra? Is there no way to think about the ket multiplied by the...

I guess the issue was just that I was not aware that I should be applying ##\int dx## at all, the book wasn't clear about this (as far as I know). Are you doing it soley because of the dirac delta? Or for continuous quantities, is it implied that expressions are to be integrated over? Also...

I see... Later in the same chapter, for many particles, this is given: $$\psi(x) | y_1 ... y_N \rangle = \sum{k=1}^{N}(\pm)^{N + k} \delta(x - y_k) | y_1 ... y_{k-1} y_{k+1} ... y_N \rangle $$, where ##\psi(x)## is the annihilation operator and x is another coordinate that CAN equal y (To...

I'm reading Stefanucci's Nonequilibrium Many Body Theory of Quantum Systems. In the first chapter, where it goes over basic quantum mechanics, it first defines the usual orthonormality condition I'm familiar with, $$\langle n' | n \rangle = \delta_{n, n'} $$ where $$ | n \rangle$$ is the ket...

Sorry, I should have provided a lot more context. The book is Nonequilibrium many-body theory of quantum systems by Stefanucci, ##\hat{h}## is any generalized hamiltonian ##\hat{h} = h(\hat{r},~\hat{p},~\hat{S})## where "##\hat{r}## is the position operator, ##\hat{p}## is the momentum...

Currently reading a textbook on non-equilibrium green's functions and I'm stuck in chapter 1 where it recaps just general quantum mechanics because of dirac deltas included in the matrix elements of a generalized hamiltonian. The textbook gives this: I just don't understand how to think about...

1. True 2. I'm not quite sure what "the external pressure exerted by the inside face" means- does that mean the pressure that the internal gas exerts on the exterior? If so, I would say True but only in a reversible process.

This makes a lot of sense, thanks a ton!