Recent content by snooper007

The following formula appears in P J Mulders's lecture notes http://www.nat.vu.nl/~mulders/QFT-0E.pdf {\cal C}~b(k,\lambda)~{\cal C}^{-1}~=~d(k,{\bar \lambda}) (8.18) where {\cal C} is charge conjugation operator. \lambda is helicity. I don't know why there is {\bar {\lambda}} on the...

I think that problem is three dimensional the hydrogen is confined in z direction only, and moves in Coulombic central field in the other two dimensions! am i right?

(1) Quantum Transport: Atom to Transistor (Hardcover) you can consult Amazon through the following threads https://www.amazon.com/gp/product/0521631459/?tag=pfamazon01-20 (2) Nano- And Microelectromechanical Systems by Sergey Edward Lyshevski...

\chi=C\sum\limits_{M_s=-S}^S \frac{M_S^2}{2S+1} =C\times 2\times \frac{1}{6} \frac{S(S+1)(2S+1)}{(2S+1)}=\frac{C}{3}S(S+1)

\sum_{k=1}^n k^2=\frac{1}{6}n(n+1)(2n+1)

in the common sense, if one's book use quantum physics this book is written for beginners. while quantum mechanics "terminology" is written for graduate oriented students and researchers.

I have understood this problem

maybe youcan consult S. Datta book Quantum Transport from atom to transistor

Thank you Gokul43201!

Noether's Theorem and conserved current \partial_]\mu j^\mu=0+four-dimensional stokes theorem.

Thank mathman and Matt Grime for your help. I was perplexed at this problem for several days.

what is the essentail difference between local density of states and density of state? It is very difficult to figure it out

Is the square of Heaviside function equal to Heaviside? H(t-t')\times H(t-t')=H(t-t')? Please help me on the above equation.

help about the Nonequilibrium Green's Function in H. Haug and A.-P. Jauho Book Quantum kinetics in transport and Optics of Semiconductors Eq.(4.31) C^r(t,t')=A^<(t,t')B^r(t,t')+A^r(t,t')B^<(t,t')+A^r(t,t')B^r(t,t') I can not derive this equation, my result has a extra term \theta(t-t') i.e...

I recommend the book by Ramond "Quantum field theory, a modern primer" Path integral methods is a powerful tool in Quantum field theory, particularly in Gauge field theory.