Tunneling Definition and 247 Threads

I read that the mass of the Higgs boson is such that we may be living in an unstable vacuum state, and if a region of the universe tunnels to a lower energy vacuum state, and eventually the whole universe would be in that lower energy state (ending life on earth). Do physicists have guesses...

Homework Statement A beam of particles of energy E = 9 eV strikes on a step potential and 25% of the beam's particles is reflected back. What is the height of the step potential? (A) 4 eV (B) 8 eV (C) 3 eV (D) 1 eV (E) 5 eV Homework Equations √(R) = [√(E)-√(E-U)]/[√(E)-√(E_U)] The Attempt...

In my research, I've always seen variable range and nearest neighbor hopping referred to as tunneling processes. However, I've also read papers that differentiate tunneling and hopping as two different transport mechanisms. Can someone clear this up for me? Given the context, what exactly is...

I recently found an interesting read on the mysteries of quantum mechanics, here : Don't know about you, but I am personally confused by this result. How can a photon travel faster than itself? If it can travel faster than itself, than what does that mean for the universal speed limit? My...

Hi, We now electrons do tunnel and for example FE happens because of this. However, is it true to scale up this effect for non-subatomic particles? For example, is it OK to say, if you are behind a wall and hit yourself to the wall, there is a chance that you might Tunnel and see yourself on...

Hi everyone Homework Statement I have to calculate the probablity that someone can tunnel a wall with a car. I have the mass of the car and the velocity and I know that the wall is 20 cm wide. But I have troubles estimating the potential of the wall. Homework Equations - The...

If an election can tunnel through atomic structures, or move through atomic barriers even when they don't have enough energy, could it be possible to create fusion through tunneling, even without sufficient energy, sufficient relative to standard energy levels needed? I am thinking that it...

Hi, My friends! According to quantum mechanics books ,a particle has some probability hop through the potential even when the potential is large than kinetic energy. They all explain the phenomenon by solving Schrodinger equation. Indeed, the wavefunction doesn't equal 0 behind the potential...

Hi, I am a physics student but still a layman in QM. I got a task to explain Quantum tunneling and I did my researchs for 3 days (I have read almost all threads here regarding to the topic). I found many different interpretations but I believe the Schrodinger's Equation is the correct answer...

It involves quantum tunneling, both of us know very little about physics but I watched a video on youtube about a guy explaining quantum tunneling, from what I underdstand a particle can, with enough energy pass right through other solid surfaces? So I said that if you had a penny, and shot it...

Would a water wave leak just like an electron with a barrier?

I recently took an exam in which the professor asked the following question: Suppose an object of mass 2 grams were incident on a rectangular barrier of height 20 cm and width 2.0 cm. What is the probability that the object will quantum mechanically tunnel and appear on the other side? I...

When the STM becomes unstable(large variations in the current), what procedures should I take in order to fix it? I am new to the STM, but after a few month`s experience I notice that one of the main problems is stabilizing it. When the tunneling current becomes unstable, I`ve tried to...

Alexander Vilenkin has a model of cosmic origins which describes the universe coming into being as a quantum tunneling event. The problem that I see with this, is that this requires the universe to be closed. However, we know the universe is probably flat with a margin of error of less than 1%...

Homework Statement I am given a metal-oxide-semiconductor device. I apply a positive voltage (30 V) on to the metal. Theoretically, the electrons should tunnel through the oxide. I want to calculate the oxide thickness for only 5% of electrons tunneling through the oxide. Homework Equations...

What is the barrier field in fowler-nordheim tunneling?i'm having a hard time understanding it please help.

A quantum particle can tunnel through a barrier and we can describe why this is so by the uncertainty principle. However, there is something I want to clarify about the reasoning behind this. I believe the argument goes like this: Imagine the quantum particle never entered the barrier and we...

Hello. Okay, so there are some theories like string theory that say that there are extra dimensions of space that we cannot see. Extra dimensions if they exist would allow more degrees of freedom in movement. This website demonstrate how barriers insurmountable in a lower dimension would be...

We have some material with metal atoms inserted in substrate.Maybe by dopping. Electric current is able to move only be quantum tunneling jumping from atom to atom. Could we obtain superconductor in this way?

In this paper ("Molecular Vibration Spectra by Inelastic Electron Tunneling" by J. Lambe & R.C. Jaklevic Phy.Rev. Vol 165, Article 3), the author showed that when external voltage is applied across a metal-insulator-metal, the current passing through the insulator is shown to be: I(V) =...

Homework Statement The edge of a nucleus can be roughly modeled as a square potential barrier. An alpha particle in an unstable nucleus can be modeled as a particle with a specific energy, bouncing back and forth between these square potential barrier. Consider a nucleus of radius r and an...

Homework Statement A proton's energy is 1.30 MeV below the top of a 14.0 fm-wide energy barrier, What is the probability that the proton will tunnel through the barrier? Homework Equations η=\frac{\hbar}{\sqrt{2m(U_{0}-E)}} P_{tunneling}=e^{\frac{-2w}{η}}The Attempt at a Solution I have...

It's on page 4 (this isn't homework, just something I stumbled upon, it's also in Griffith's 8.17):http://www.physics.udel.edu/~msafrono/425/Lecture%2018.pdf . Can someone help me understand this solution? What exactly is happening...are there particles at h/2 that are smashing against the...

Imagine we have material with very low heat conductivity in which metal nanoparticles are embedded and distance between each those nanoparticles is 1 nm.When we heat one side of such material,will electrons tunnel to the colder side?Is it possible some usefull energy generate in this way?

You know how every particle has a non zero probability of being anywhere, but what about outside the particles Hubble sphere? In other words, does is there exist a nonzero probability that a particle can travel at superluminal speeds across the universe?

Dear forum members How to block tunneling current? Apart from barrier dimensions like height and thickness are there any other options? Say barrier geometry or chemical property, maybe some magnetic impurity to induce Kondo effect and scatter the tunneled electrons. Thank you in advance Dilema

If you know how a single electron transistor works, can you please explain to me what the tunneling junctions are necessary for? I mean, if we would remove the two tunneling junctions and connect the drain, the source and the island into one long wire, wouldn't still it be possible to create a...

Hi, In case of alpha decay from Uranium atoms, i thought the barrier is the strong nuclear force, but i had seen many textbooks saying that it is electrical barrier, and i did rethink the subject and i imagined it as a barrier that have electrical force from one side and strong nuclear force...

I was reading "The physics of superheroes", and it mentioned The Flash being able to increase his kinetic energy to tunnel though walls. I tried to find out how fast he would have to go, assuming he is vibrating (as shown in the actual comic) so will have several tries at trying to tunnel though...

Can anyone break down "quantum interference" in the tunneling transport through aromatic organic molecules? The Math is a little fuzzy, but with a few seminal reference or a conceptual description i might be able to wrap my mind lips around this knowledge pop! haha. any help would be appreciated.

A beam of 11 eV electrons is directed towards a barrier of potential Vo = 3.8 eV. Compute the width of the barrier for which the reflection is maximized (Note: this is NOT asking for when reflection is 100%). Transmission probability for E > Vo: T = [ 1 + (Vo²*sin²(βa))/(4E*(E - Vo)) ]^(-1)...

Hi All, I'm sure this question has a trivial answer but for the life of me I've no idea :\ I am calculating (numerically because I am lazy and it scales/ports better to other cases) the phase shift of a particle in the non-rel Schrodinger equation tunneling through a potential step. This...

Hello :) , Does anyone know some good paper or book from were it's possible to learn physics behind of work of resonant tunneling diode(RTD)? In last semester I had course in ˝microelectronics and nanoelectronics˝ and we studied basic principle on which RTD works, and it was very interesting...

The wavefunction associated with a free particle must be continuous at the barrier and will show an exponential decay inside the barrier. Why it shows an exponential decay inside the barrier? After coming out of the barrier, there is reduced probability for the particle. When there is no loss of...

Hi, I am a student who's learning about quantum mechanics. I was reading about the RTD (Resonant tunneling diode) and I got the general idea. However, I was looking at a I vs V graph and came up with a question. Since Resistance = V/I, the inverse slope of the I vs V graph has to be the...

Homework Statement A 1.1 eV electron has a 10-4 probability of tunneling through a 2.4 eV potential barrier. What is the probability of a 1.1 eV proton tunneling through the same barrier Homework Equations eq 1) T= [1 + V02 sinh2(kL)/4E(V0-E)]-1 or if (kL)>>1 we use eq 2) T=...

Tunneling equation...have all the pieces, just can't figure out the calculation! Hi, I have an example from my book on Tunneling. All the parts of the equation are given, including the answer...put I keep comming up with the inccorect answer. Maybe someone can clarify how to calculate...

1. Let 11.0-eV electrons approach a potential barrier of height 3.8 eV. 2. (a) For what barrier thickness is there no reflection? (b) For what barrier thickness is the reflection a maximum? 3. For part (a) I tried using kL=npi where k=sqrt(2m(E-V))/hbar, because this is where the Probability...

When we want to show quantum behavior (like tunneling or double slit) of a large object like a buckyball molecule, what do we need to watch out for in an experiment? Is it the following? a, that all constituents of the object (the single atoms of the buckyball) are described by one coherent...

I have always been curious about what would happen to the gravity at the center of the earth. After some googling I found some neat stuff. So IF it was possible to endure the heat and pressure to get there (impossible) it would feel weightless. So that answered my question but then I read it...

Homework Statement Two copper conducting wires are separated by an insulating oxide layer. This layer acts as a square barrier of height 10 eV. Estimate the transmission coefficient for penetration by 7 eV electrons (a) if the layer thickness if 5 nm and (b) if the layer thickness is 1 nm...

So i was messing around with a wax prism and a microwave emitter. So I have an emitter and a detector and the microwaves are being shot straight across to the detector. But when I place a Wax prism in between it stops getting the signal . But then when we place a second wax prism next to it, it...

Taken from an entirely empirical standpoint, the true nature of Consciousness should be the Chinese room argument, that it is nothing but an illusion created by the interactions of billions of neurons, electrical and chemical signals. Supposedly this would disprove "The Human Soul" and...

Hello, I'm following an introductory course in modern physics. So I understand there's a chance the particle appears on the right side of the barrier, and this has been experimentally verified. Now I was wondering: can the particle also appear in the barrier? If so: is this directly...

Hey there, I'm pursuing a degree in Msc. Nanoscale science, and I've been studying about Scanning tunneling microsopes that use Quantum tunneling to study the surface struture of materials. My question is: What is the maximum distance between the surface that's been studied, and the STM tip...

Alright, so there's definitely a lot of Sci-Fi hype about Entanglement. I'm sort of hoping the experts on the subject can set this straight. Question: Could it actually be used to transfer information instantly from one point to another, seemingly providing FTL communication? And second, does...

How close do two room temperature deuterium nuclei need to be to each other to have a one-in-a-quintillion chance of "tunneling" into each other so that the nuclear forces bind them together despite the repulsive effect of the positively-charged protons?

I've heard that Sun is not hot enough to sustain thermonuclear fusion at the level we observe. Instead, the solar output relies on quantum tunneling of protons through their natural repulsive barrier. Might this same effect be useful in obtaining controlled thermonuclear fusion? It seems to me...

So I've been reading up on some quantum tunneling. It seems as though everything I read on it only conveys an elementary view on the matter, as if their target audience was the general public. I am here to gain a more sophisticated understanding of this concept. As I currently understand...

Howdy, Can anyone explain qualitatively (without using any maths) why a particle with a smaller mass has a greater probability of tunneling through a potential barrier than another particle with a larger mass but of the same total energy? Thanks