Quantum Mechanics

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Questions related to Quantum Mechanics

Technical details about Stern-Gerlach apparatus and experiment with spin 1 atoms?

Dear friends, I am interested in the Stern-Gerlach experiment, with spin 1 atoms. I see in pictures that the apparatus contains two long magnets, typically, of 13 cm length. I am interested to...

06 October 2016 2,495 14 View

When do we treat a set of particle with the non-relativistic QM, and when do we treat them with QFT?

Assume that the particles in the system don't react among themselves and don't undergo any change of the type of particle. Assume also that their energies are not very high, i.e. we don't have...

01 October 2016 2,912 19 View

Who can help me analysis the band structure?

I calculated the band structure of O2 adsorbing in CH3NH3PbI3. I got the result as the following attach. who can tell me why it appear the fat band. anyone has suggestion?

19 September 2016 5,175 6 View

How magnetic properties relates to micro-structure/texture? does homogeneity or heterogeneity have any effect on magnetic properties?

Hello, the magnetic properties of metallic materials are mainly affected by their electrons structure in atoms. but I was wondering if micro-structure and the state of the grains have any effect...

19 September 2016 6,625 3 View

Generalization of angular momentum in 4 space-time dimensions; how to understand angular momentum of a black hole?

L= r x p is a 3 dimensional relation. In 4 dimensions r and p are 4 vectors and L is a 4x4 matrix. We want to discuss conservation laws related to angular momentum in 4 space time dimensions. Then...

12 September 2016 1,463 8 View

What is the reason for not getting a well stabillized DNA molecule in a molecular dynamics simulation?

Hi Friends, I have done a molecular dynamics simulation of a DNA molecule for 100ns in Gromacs with amber force field. I expected a well stabilized system but I got structures with small...

07 September 2016 9,117 9 View

Real analysis of quantum relativisticity in linear algebra?

[Fifth edition in Taiwan on 31/8/2016 at night] Dear colleagues, I have a though those two days as follows*: A molecular state converges to the asymptote (either toward nuclei or separating...

29 August 2016 5,981 0 View

How can I quantify the vehicular traffic along a provincial road network connecting several urban centers?

I've not expertise on traffic flow assessment, but I need a simple model to calculate the amount of traffic on road stretches connecting several nodes, possibly by using only data on population of...

19 August 2016 3,736 16 View

Hello friends, what is the easiest way to prepare input files for QM/MM calculations using ADF?

I was trying to submit a QM/MM job to ADF and I wanted to use pdb2adf utility in ADF, in order to make the proper input file, but somehow was not getting it right. I will be submitting a QM/MM...

17 August 2016 4,449 10 View

What is the energy density within non-relativistic quantum mechanics?

When googling for this topic, I don't get helpful results. In one article I have seen u=Re(psi* H psi). However, i), in stationary cases, the kinetic energy density, psi* T psi, becomes negative...

11 August 2016 7,640 8 View

Could the Higgs boson be an artefact?

I found that in the LHC there can occur some symmetric ordering of protons in the high magnetic field. An interesting formation would be 6-ring+3-ring+1 = 10 protons. When two 10-protons packets...

06 August 2016 1,918 6 View

Is it ok for perpendicular magnetic anisotropy (PMA), the film is either pollycrystalline of crystalline?

I do not have much knowledge about thin films. how a Polly-crystalline film can show magnetic anisotropy? why the pollycrystalline film is not good if the material show in-plane magnetic...

22 July 2016 4,988 7 View

Is there any published experimental evidence that the photon (radiation) exerts gravitational attraction?

Reference to the equivalence principle is not an answer. Use in the Einstein tensor is not experimental evidence, nor is use in the Friedmann-Robertson-Walker (FRW) model for cosmology. Argument...

17 July 2016 470 55 View

How Real is Wave-Function while Non-Linear Interactions Between the Photons?

The present work is motivated from the recent paper arxiv.org/pdf/1412.6213v2.pdf, which is also presented in the most famous journal "Nature". The main result is derived much simpler way.

13 July 2016 3,618 2 View

Particle without Wave Function?

Many mysteries and set of behaviors are based on particle and wave functions of energy. Here are few questions which might get raised for more deep down understanding and future applications of...

05 July 2016 6,108 21 View

Why there is no aberration of light sources on earth?

The orbital speed v of the planet Earth is about 30km per second to the east. The ratio v/c against the speed of light is 1/10000. As the light propagates independently from it's source there is...

03 July 2016 7,251 8 View

Can 'the collaps of a wavefunction' be understood as a computational breakdown due to Nature's limited computational resources?

Consider an electron entering a grain of salt (NaCl). In a quantum mechanical description of the process the wavefunction of the electron will see more and more ions in its range of influence and...

28 June 2016 4,249 44 View

In Quantum Computing, where is the extra information held?

In Quantum Computing, there is something known as the Holevo bound - which basically says that a q-bit cannot deliver more than a bit of information into our spacetime, although it can carry...

21 June 2016 7,139 12 View

Is this Intrepretation of the wave function possible?

I would like to put to the critic of the RG participants a hypothesis about the nature of the wave function (WF) - more specifically about WF collapse. According to it: the particle is a real...

20 June 2016 7,672 9 View

Help with isolating pellet after amplification?

I'm working with ETH-2-Gold phage and VCSM13 helper phage, I'm using TG1 as my host. I spin down the bacteria 10,000rpm for 30mins, then add 2ml of 20% w/v PEG6000 in 2.5M NaCl to 10ml of...

17 June 2016 8,444 6 View

How DFT with a given functional (here CAM-B3LYP) can reproduce correctly and coherently bond distances in different spin states ?

I have an octahedral iron complex

12 June 2016 10,011 1 View

The "realism" hypothesis in QM. Do we have an experiment that disproves it?

The realism hypothesis in QM says that results of measurements on quantum systems, are completely determined by subquantal parameters (hidden or detectable, local or non-local). These parameters...

12 June 2016 7,217 50 View

What is the mean field theory? how it can help in the study of quantum paraelectric?

i am studying about dielectric measurement at low temperature in quantum paraelectric..

11 June 2016 8,361 1 View

Why don't we have force operators in quantum mechanics?

Since, classically we define force as rate of change of momentum and by weyl rule we can map classical functions to quantum operators. Then, why is it that we don't often hear the word 'force...

09 June 2016 8,711 5 View

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