Quantum Theory

When two dissimilar metals come into contact the Fermi energy equalizes. Electrons flow from metal with higher Fermi energy to the lower one. But then they create charge difference and electron flow stops. But what happens when two intrinsic (non-doped) semiconductors come in contact? If electrons and holes in these materials have the same mobility, will holes flow from one material to another as well?

When Alain Aspect in 1982 (and others since and before) performed quantum mechanical experiments (such as entanglement) to test Bell's inequality, the results were in agreement with quantum theory and not local hidden variables. And the same agreement with quantum theory was obtained even when the entangled states had become separated by kilometer sized distances. The fact that the results were not affected by distance, doesn't this, ironically, suggest that quantum theory is not the explanation? Rather than support quantum entanglement, shouldn't such results suggest that the explanation - by some means - is through 'local hidden variables'? Since a local hidden …

I am not a physicist, nor even a scientist, but I would like to put forth an argument for an idea I have that is related to quantum entanglement. I believe that this is a testable/replicable concept. The concept requires, I think, several "leading" assumptions/questions, maybe as many as ten of them, to get everyone thinking on the same page, as it were. I will try to make the questions as plain and unambiguous as possible. I will ask the questions one at a time, evaluating responses and restating the assumption/question until there is consensus of what is meant. I would appreciate plain language responses, if possible. Question #1: I have read that it is now …

I've just worked out the attached analysis for a Stern Gerlach experiment including tracing out the environment. Have I done this correctly? Is the result for Sx correct? Many thanks for any help. Expectation values for paper-1.pdf

Can anyone muster, even a slight, non-joking, scientific theory that can explain as to how the car works? Use best of your knowledge in quantum physics or whatever is required to explain it.. ~EE

Now, I am only fourteen year old 8th grade student. However I was watching the The World of Quantum - Full Documentary HD 2014 on YouTube.com, and I got to 38.42 min. and wondered if the Quantum Entanglement or also referred to as "Spooky action" that is used to teleport a photon, could be used to teleport a electron? And then a after successful test would that electron still be negative? Because one of Isaac Newton's laws of physics state that "Every action has a equal and opposite reaction." Therefor would the electron still be negative or even a electron anymore? Please correct me if I am wrong using the "Reply" option or my email/gmail: email address removed Link to…

I heard about wormholes, I get they are shortcuts through spacetime, they are generally too unstable to use, and that they may be able to travel through time. What I don't understand is why they randomly punch holes in space time and how they do it. Is it simply a large amount of energy that creates them or some kind of gravitational anomaly? Another question is what happens if you're inside the wormhole when it collapse? Since matter can't be destroyed do you enter some kind of dimension we never thought of or do you just instantly get shot out the way you came? And how would someone make it stable or hasn't that been figured out yet? Thanks in advance

I would like to ask a question about (Eggert's?) Double Slit Experiment, but first I would like to check my understanding of the current interpretation. My understanding is that when electrons are fired individually at a double slit, the observed result is an inteference pattern similar to that observed when a wave passes through a double-slit. The conclusion inferred from this observed pattern is that the electron is actually in two places simultaneously (ie it passes through both slits at the same time) and consequently interferes with itself to produce the observed pattern. This is then used as the basis for Quantum Theory. Is my understanding correct? Th…

Assume there is multiple universes, is the dark matters(or energies) in our universe actually the matters(or energies) of another universe? According to quantum theory, is it possible to use quantum computer to communicate with other universes in future? Can we use LHC to test the correctness of questions above? Thanks all brothers and sisters for joining the discussion.

So I am more of a relativity guy, so I never ventured into the realm of quantum mechanics or the theory. I do know that it is an essential part in understanding the universe at the very small sized level. I also do know that it is related to research in time travel, teleportation and computers using a code more complex than the binary code. I also do now that is one of two theories that comes closest to the goal of science(in my eyes): to create a singular theory that describes everything in the universe. But that is all a vague idea and I want to get started on understanding this theory, so I wanted to see if you guys could help me out on getting started. I am only l…

Are electrons considered to be in a superposition of locations within its orbital when not being observed i.e. smeared out in the field in effect? When you measure it, the field becomes excited in a single location?

The Higgs Mechanism requires a field (the Higgs field). This field has been added to the Standard Model. Is the Higgs field a "new form" of an old idea (the eather)?

http://gizmodo.com/quantum-weeping-angel-effect-freezes-atoms-in-place-1730914717 As I read the article and I suddenly imagined something verry romantic and in some unclear sense reasonable. Does it mean this quantum zeno effect that When we watch over the night sky and see the stars we affect them someway even imenssevly undetectable and enourmosly unimportant ? May be the very few unique photons from their starlight reaching only very your eyes and nobody else ,or my eyes and nobody else as there are enought photons and directions of rays for any individual eyes may be for all over the world people, can affect in a very unique quantum way part of the starlife. And…

Apologies if this has been asked before but as this thought experiment doesn't have a title that I'd know of it's hard to search for it to see if it has been asked. We have a pair of entangled particles. They fly apart toward a different experiment each. Particle A is flying towards the classic double slit experiment which reveals the wave nature of light and the classic interference pattern. Particle B is flying towards another double slit experiment but this one has a detector on one of the slits so we can see which slit the particle went through. There are three ways we can perform this experiment. 1. Particle A reaches its experiment first and we g…

History of the "quantum of action" (1900-1927) / by Socratus / =====. a) In 1900 Planck united together two formulas ( Rayleigh–Jeansfor for long and Wien's for short wavelengths) and then divided them. He was himself very surprised when the result was found correct. And after that came . . . . : " . . . some weeks of the hardest work of my life . . ." The result was – quantum of action (as energy multiply time: h=Et) The coefficient (h) was neither in the Rayleigh–Jeansfor nor in the Wien's formulas. Planck took unit (h) as in some books are written: "intuitively, instinctively, phenomenologically" b) In 1905 Einstein introduced unit (h) in differen…

I thought about putting this in the pseudoscience forum, but I am pretty sure this is based on a decent lay understanding of quantum theory basics. I have a thought experiment on quantum entanglement and communication that I would like to present and get some feedback on. - Imagine a "transmitter" that consists of a bank or row of 27 boxes. - Think of these boxes as keys on a keyboard. - Each box contains a tiny linear accelerator, with a single particle in it, going around and around. - Each box is labeled for a letter of the alphabet, with the last box labeled "space." - Now imagine a "receiver" which consists of another row of 27 boxes. - Again, each box has a tiny l…

Hello to all ! In MOSFET at strong inversion electrons confined to triangular quantum well, electrons occupy only 1 or 2 lowest subbands. and the Van Dort model gives the quantum mechanical intrinsic carrier density in inversion channel via increased energy band-gap(ΔE). NQM = NCL× Exp(-ΔE/2kt) this carrier amount is very high. But density of states for inversion charges in subbads reduced from the higher 3-D density to the lower 2-D density. Then still HOW the above Van Dort's formula giving that high amount of charge..?

Hello everybody ! Recently i heard that, application of an electric field onto a quantum well tilts the quatum well and changes its 2-D density of states to 3-D bulk density. Is this true..? Can any body give some more information or reference on this..? Thanks for any Help.

I have heard so many times that subatomic particles are in no specific state until they are observed and about the double slit experiment. I have no doubt this is correct,but I don't understand 1- If it hasn't been observed yet, how would anyone know? And 2- What counts as an observer? A scientist who knows what they are looking for? A fly in the room that sees the experiment? A passing photon? Is it literally observation through sight apart from the other senses? How has this been proven if presumably any experiment would itself be an obervation?

Can anyone tell me why an electron when excited to a higher energy state will try to get to it's lowest energy state? I assume it has something to do with Coulomb Law. It is just a property of the electromagnetic field or is some deeper spacetime parameter involved?

Two statements seem contradictory, "the muon is not believed to have any sub-structure—that is, it is not thought to be composed of any simpler particles" and "Muon decay always produces at least three particles, which must include an electron of the same charge as the muon and two neutrinos of different types." If a particle decays, it must be composed of something that can decay, instead of having no substructure. What is really happening?

Can photons pass through glass unperturbed? Can the properties of the photon be altered if they do interact with an atom once re-emitted?

If entangled particles instantly effect their partners, (i.e. if one is observed spinning one way, the other will be spinning in the opposite direction), then would that mean theoretically that quantum computers could communicate over a distance without an internet connection?

I'm really not working in this area at all, so my thoughts might be right off, and if there is good reason, I'm quite happy to abandon this line of enquiry... anyway, on to my issue with gravitons. Firstly, by the equivalence principle if we imagine ourselves in a box which is being accelerated, we cannot tell whether it is being accelerated at 1g towards a planet which is below us, or accelerated at 1g by a rocket moving upwards (relative to the box) in free space - both cases in an otherwise empty universe. in my box I have a hypothetical 'graviton detector' which is good enough to detect gravitons from a planet (in reality no such thing could exist, because you'd n…