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| bio | website | |
|---|---|---|
| location | Germany | |
| age | ||
| visits | member for | 1 year, 7 months |
| seen | 7 hours ago | |
| stats | profile views | 54 |
A PhD student in Germany. physics.reality@gmail.com
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May 1 |
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English translation of Helmholtz' paper: “On the Physical Significance of the Principle of Least Action” Looking at the contents of this book, it does not contain the paper in the question. |
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Mar 13 |
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Hamiltonian of a simple graph $\Sigma_z=S_1^z+S_2^z$ The first matrix you wrote for $\Sigma_z$ is consistent with the definitions for$S_1^z$ and $S_2^z$. What is the problem in $S_1^z |ZZ\rangle=-0.5|ZZ\rangle$ ? Isn't this expected? |
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Feb 12 |
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Nuclear Magnetic Resonance (NMR) Conceptual Questions Are you having difficulty trying to visualize the time evolution of the magnetization? Try to use this simulator: drcmr.dk/BlochSimulator |
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Jan 6 |
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Simulating the evolution of a wavepacket through a crystal lattice @hwlau I am not an expert in either of them. For sufficiently small systems, direct evolution with a simple 4th order Runge Kutta algorithm is sufficient. This amounts to using a truncated Taylor expansion of the time evolution operator. The Hamiltonian is represented as a sparse matrix. |
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Dec 31 |
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Simulating the evolution of a wavepacket through a crystal lattice Have you thought of using numerical algorithms, such as tDMRG, TEBD ? |
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Oct 26 |
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What is the spin rotation operator for spin > 1/2? Of course I am asking about the analogous formula for the expansion of the exponential in terms of cosines and sines not about the spin matrix ! |
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Oct 5 |
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Scale invariance symmetry as a simple argument in an electrostatics problem This is a valid proof, but I doubt that it is the scale invariance symmetry meant by Prof. Preskill. He wrote: "Actually, this problem can also be solved by a symmetry argument, though the symmetry used is less obvious than rotational invariance. Readers may enjoy constructing this symmetry argument, which (in keeping with the theme of this post) I find more elegant than the argument using concentric rings suggested by your hint." Please read the discussion in the post in the question. |
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Sep 12 |
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Driving a solution of optical isomer molecules with the resonant frequency I am indeed interested in the simulation details of this. If you wish, you can send to [my email]. In order to understand the theory behind this, we should first know how the chiral states are stabilized in the first place. One famous stabilization mechanism is [decoherence] (prl.aps.org/abstract/PRL/v103/i2/e023202). It seems to me that the predictions of this paper can be tested based on the setup in the question. |
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Sep 12 |
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Driving a solution of optical isomer molecules with the resonant frequency Aren't $\psi_{L/R}$ the chiral states which are not eigenstates of the Hamiltonian, (and hence the paradox of Hund), while $\psi_\pm$ are the true eigenstates (which are not degenerate)? |
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Sep 12 |
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Driving a solution of optical isomer molecules with the resonant frequency The left and right-handed states are in fact degenerate. The two level system should be thought of as composed of the eigenstates of the hamiltonian/parity operator. Each of these eigenstates is either a sysmmetric or anti-symmetric superposition of the chirality states (left and right handed). |
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Jul 29 |
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How are quantum phenomena in atoms and molecules protected against decoherence? Is there a proof that the pointer states are energy eigenstates? |
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Jul 12 |
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Are there devices which convert thermal energy to electric energy? I am seeking an effect which does not require temperature gradient. Can a device be built which captures "flying" phonons and convert them to electric energy without the need for a colder surface? I am aware that such an idea may violate the 2nd law of thermodynamics, but I wish to know from a technological perspective why this is (not) feasible. |
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Apr 20 |
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Partially filled orbitals and strongly correlated electrons I think you are using the term screening here in a different sense than the usual one, where electrons closer to the nucleus screen the positive nuclear charge from electrons at a larger distance, and hence those later electrons feels a smaller nuclear charge. |
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Apr 18 |
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Partially filled orbitals and strongly correlated electrons @JohnRennie See: en.wikipedia.org/wiki/Strongly_correlated_material |
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Feb 10 |
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Electrodynamics textbook that emphasizes applications Thanks Chris. I didn't mean engineering applications like transmission lines and waveguides, but simply applications from everyday life for the curious students. |
