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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
May
4
comment Two solutions, A+ and A-, for masses connected via springs
Basically, we want to find $A_j$ as a function of $j$. It turns out that both $A_j=A_+ e^{i\theta j}$ and $A_j=A_- e^{-i\theta j}$ work, for some $A_+$, $A_-$, and $\theta$ independent of $j$. You should be able to find $\theta$ in terms of $\omega$ and $\omega_0$.
May
3
comment Graph of energy stored in capacitor?
Let us continue this discussion in chat.
May
3
comment Graph of energy stored in capacitor?
Try starting with $Q=Q_0-It$, where $Q_0$ is the initial charge the capacitor has.
May
3
comment Graph of energy stored in capacitor?
Alternatively, you can write up your own answer, and show us how you can get correct graph.
May
3
comment Graph of energy stored in capacitor?
The equation $Q=It$ is incorrect, since $Q$ should be nonzero when $t=0$.
May
3
awarded  Popular Question
Apr
27
awarded  Popular Question
Apr
22
awarded  Popular Question
Apr
7
comment Does changing the electric / magnetic field cause self-reinforcing induction of the other?
@LandosAdam In this situation, you can think of the fields repeatedly producing each other. But ultimately, the total electric fields and the total magnetic fields have to satisfy Maxwell's equations.
Apr
4
revised Precisely speaking, does photon become massive or the phonon become massive, due to Higgs mechanism in superconductor?
grammer, typo
Apr
4
suggested approved edit on Precisely speaking, does photon become massive or the phonon become massive, due to Higgs mechanism in superconductor?