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 Feb 9 comment What will be final velocity of three charges $q$, $q$, $2q$? @AnubhavGoel, when $B$ is in the equilateral triangle, the force is not along $OB$, because of the unequal charges. This causes $\theta$ to change, until $t\rightarrow\infty$ when the force is along $OB$. Feb 9 comment What will be final velocity of three charges $q$, $q$, $2q$? @AnubhavGoel, if the force is not along $OB$ at $t\rightarrow\infty$, the angle $\theta$ would not be a constant. Feb 3 comment What will be final velocity of three charges $q$, $q$, $2q$? @AnubhavGoel, if the force is not along $OB$, the angle $\theta$ would change. Feb 3 answered What will be final velocity of three charges $q$, $q$, $2q$? Jan 28 comment Electron self-energy calculation for a $k$-dependent interaction You might want to check out the similar calculation for electron-phonon interaction, for example in the book by Mahan. Jan 26 comment Charge inside a charged spherical shell It is certainly unintuitive. However, let's say the charge $Q$ is somewhere on the left of the shell's center. Let $A$ be the part of the shell on the left of $Q$, and $B$ be those on the right. $A$ pushes $Q$ to the right, while $B$ pushes $Q$ to the left. The force by $A$ is intuitively stronger since it is nearer to $Q$. However, $B$ has more charges, and the two effects somehow cancel out exactly. Jan 26 comment Open-source code for computing response functions @CuriousOne, thanks, the hepforge projects look invaluable. It would be great if something similar exists for the condensed matter community too. Jan 26 asked Open-source code for computing response functions Jan 23 awarded Notable Question Jan 18 awarded Nice Question Dec 19 awarded Notable Question Nov 23 awarded Popular Question Oct 27 asked Charge and spin susceptibility in the random phase approximation Oct 22 comment Why is there a superconducting dome in superconductors? You may be interested in this paper: Sci. Rep. 2, 381 (2012). Oct 22 comment Why is there a superconducting dome in superconductors? Doping does not necessarily increase the density of states at the Fermi surface. Regardless, I believe the origin of the dome is still an open problem. One way to look at it is that doping changes the Fermi surface. This then affects the interactions between electrons and spin fluctuations that are responsible for superconductivity. When the system is overdoped, the interactions become weaker and $T_c$ decreases. Sep 23 awarded Popular Question Aug 31 comment Can hydrogen be used for superconductors? Superconducting transition temperatures depend on many things in addition to the mass of the isotopes. Aug 29 comment What is a Fermi arc? The Fermi surface of a 2D system is typically a closed contour that encloses a region in momentum space. However, in some cases, the contour is not closed. Such a Fermi surface is known as a Fermi arc. See DOI:10.1126/science.1248783 for some experimental results about Fermi arcs in the cuprates. Aug 3 awarded Popular Question May 21 awarded Notable Question