Recent content by ubergewehr273

Hi, thanks for this! How would I proceed in measuring the inductance using frequency domain reflectometry? I understand that one-way would be to basically build an LCR series circuit with proper impedance matching with respect to the source transmission line and to measure the reflectance at the...

Hi all, I recently fabricated a bunch of gold coils patterned onto a glass substrate and am in need of measuring the inductance of these samples. Since the feature size is in microns, I can't exactly use an RLC meter. At the moment, I'm trying to build an LCR series circuit with a PCB and...

Hi everyone, I've been studying about semiconductor heterostructures and in particular quantum dots. I was wondering, why is there a need to have a "capping" layer above the layer where the quantum dots are formed within a sample? Thanks in advance!

Now from the relevant equations, $$U(t) = \exp(-i \omega \sigma_1 t)$$ which is easy to compute provided the Hamiltonian is diagonalized. Writing ##\sigma_1## in its eigenbasis, we get $$\sigma_1 = \begin{pmatrix} 1 & 0\\ 0 & -1\\ \end{pmatrix} $$ and hence the unitary ##U(t)## becomes...

Hi! Reading through this paper, the Hall resistivity in ferromagnetic materials is given by $$\rho_H = R_0 B + 4 \pi R_s M$$ It is mentioned that ##R_s## (anomalous Hall coefficient) is significantly larger than ##R_0## (ordinary Hall coefficient) and has a strong dependence on temperature...

Hi! I'm trying to understand the dependence of spin hall voltage on various parameters of the material. I have been going through this paper, and it is mentioned that $$V_{SH} = 2 \pi R_s L j_x n \mu_B$$ In the equation, only ##L## and ##j_x## seem to be the variables. Does increasing ##L##...

@Choppy, Thanks a lot! This is very insightful. I'll try to keep these in mind. :-)

@hutchphd, thanks a lot! My semester is ongoing at the moment and I'm so overwhelmed with all of this. Hopefully, things will get better with time. Stay safe. :-)

Hi everyone! Hope you all are doing well in these tough times. Currently my country is going through one of the toughest second waves of Covid and frankly seeing the news is terrifying to say the least. Being at home, I've noticed that I haven't been able to study for a significant period of...

This is my reference circuit. This clearly produces the state ##\frac{1}{\sqrt{2}}(|01\rangle + |10\rangle)##. This is obviously until the measurement is done. However, I'm trying to implement a circuit which essentially gives me a 50-50 chance of getting either ##|01\rangle## or...

Thanks but I'm asking if some circuit components can be added somehow to process the former state to be the final state in question.

Hello everyone! I'm trying to implement a quantum circuit that yields a superposition state $$\frac{1}{\sqrt{2}} (|01 \rangle + |10 \rangle)$$ I'm using parameterized gates to achieve this. I have been able to create the state $$\frac{1}{\sqrt{2}}(|01\rangle + e^{i\phi} |10 \rangle)$$ Is there...

I'm not familiar with the latter one.

I'm sorry for not mentioning but the rolled paper tube is placed vertically on a flat surface and left to unwind.

I came across a problem regarding a paper being rolled into a tube. When a piece of paper is rolled into a tube and then left to unwind, it is always seen that the unwinding happens in jerks and not smoothly. Why is it so? What I have thought (and thanks to some discussions on reddit), that...