Hall effect Definition and 131 Threads

Hello fellow PFers! I have been trying to understand the Integer Quantum Hall Effect for quite a while. Many things seem to be understandable, however, I cannot create a satisfactory explanation of why IQHE (i.e. plateaux in the the Hall resistance R as a function of the magnetic field B)...

Can someone explain to me as simply as possible why the Laughlin states create energy gaps in the lowest landau level? I am trying to understand for a presentation why the Laughlin states correctly model the QHE effect when the filling factor is a odd fraction (1/3, 1/5, 1/7). As far as I...

A question on semiconductors. I need to determine the carrier concentration and type. I have worked out the type but its the conc. that is getting me. I have the conc., n, as: n = wBJ / eV w is the width of sample, B the mag. field, e is charge, and V the Hall...

One of the simple experiments for simply observing Hall effect was done. However, I have a problem with the experimental results (attached .xls) First the current in the solenoid was varied while the current in the Hall Probe was constant. Then the current in the Hall Probe was varied while...

Hi, I am doing research in Hall Mobility and Half-heusler compounds. I've taken some data on several samples now and I am kind of perplexed. We use a very stable magnetic field between -.6 Tesla and .6 Tesla to do the measurements. Currently we take data points at intervals of .1 tesla to...

My only problem with a basic conceptual understanding of the Quantum Hall Effect is the relation between longitudinal conductivity and resistivity when the magnetic field is such that the filling factor is an integer, and the Hall resistance is quantized. I fully understand the splitting of the...

I'm trying to use IC hall effect sensors for a school project *not homework, rather an ungraded research project*. Basically, we are trying to measure the magnetic field gradient inside of an experiment chamber. The chamber is surrounded by two huge copper coils that have about 1000A running...

Homework Statement http://img697.imageshack.us/img697/2317/img11l.jpg (a = 0.10 m and b = 0.16 m) i=3t^3 - 5t (i - ampéres t - seconds) Determine the voltage induced in the coil to the instant t = 3 sec. well as the current direction. Homework Equations Hall efect The...

Can someone explain the Hall Effect? If electrons are moving inside a magnetic field that is perpendicular to the wire, then perpendicular to both the wire and the magnetic field will be a resultant voltage? Why does this voltage arise?

Is the Hall Effect quantum physics?

hi what is Spin Hall effect and quantum hall effect? i can not find a good description on wikipedia.com do you have a good link or description? and another question: why in franck hertz experiment we use MERCURY instead of hydrogen? thanks

Could Anyons and Fractional quantum Hall effect create 2-D ribbons w/fractional electric charge (e/3) that combine to form fermions or bosons? Sundance Bilson-Thompson proposed a braiding model of 3's which could account for some particles of the standard model (i.e first generation fermions...

Hi, I am working with a solenoid and I am trying to measure the magnetic field that it can produce using a Hall Effect Sensor but I cannot seem to get any results from the sensor. Does anyone know how this is suppose to be done? Thanks.

Me and a friend are working on a research project that involves four-point electrical measurements. (Van der pauw) To do a hall effect measurement, the sample and probes have to have a strong magnetic field pass through. So we want some design ideas on constructing the mount that will have to be...

Homework Statement Show that the Hall voltage reverses sign if either the current or magnetic field direction is reversed, but the voltage offset reverses sign only if the current direction is reversed. Use the information to confirm the validity of equation see eq1 image Homework...

Homework Statement There is a metal bar was suspended by a spring between the ceiling and its top. Apply an electric field, from left right. Find out what happen with the bar after applying and magnetic field perpendicular to the electric filed and point out of page. 2. The attempt at a...

Homework Statement A thin metal film of length 1.00 cm, width of 0.250 cm, and thickness of 29.0 micrometers is used to measure the Hall effect. A current of 2.60 A is maintained along the length of the sample. The Hall voltage of 16.0 microVolts is detected across its width, when a magnetic...

Homework Statement metal strip 6.66 cm long, 1.11 cm wide, and 0.837 mm thick moves with constant velocity through a uniform magnetic field B = 1.55 mT directed perpendicular to the strip, as shown in Fig. 28-37. A potential difference of 2.99 µV is measured between points x and y across...

Can someone please pore some light on the entitled topic. Assume that i path an AC current through conductor. Dose it produces Hall effect? furthermore, assume that the conductor is non-symmetric, namely it is coating with another conducting thin film layer. Now is there any frequency under...

im thinking of the classic airplane problem. the one where the flying airplane develops a voltage across its wingspan. now this was posed to me as a motional emf problem and i bought it then but simultaneously thought that it seemed like a hall effect problem. so two questions now that i think...

Hey there. Trying to figure out how to find a hall voltage across a ribbon. I'm given J, B, and some other factor: R-sub-h OHM*meter/tesla. (no clue what this is... :redface: )I'm also told to assume the charge carriers are e-'s. I understand that the hall effect is used to determine which...

Using the leybold hall effect apparatus for silver http://www.leybold-didactic.com/phk/produkte.asp product ID: 58681. Dimensions l = 0.064m (distance between contact), breadth 0.02m, and thickness 5E-5 m micrometers. Resistivity of silver \rho = 1.89x10^{-8} \Omega m Resistance R =...

hi i am in a bit of a pickle and could do with some advice. i have a built, working, hall effect thruster (http://en.wikipedia.org/wiki/Hall_effect_thruster) but can't figure out how to measure the thrust it produces. any ideas? thanks stuart

As I understand it, a current flowing through a conducting strip in a magnetic field perpendicular to the current will drift to the side creating an electric field that corrects the currents motion and creates a potential difference across the conductor. Why then does a current carrying wire in...

I'm perplexed by semiclassical treatment of Hall effect. I'm referring to Aschroft Mermin text. At page 233 is my doubt: why is it necessary the introduction of w drift velocity vector and why does it take that form? :rolleyes:

If I move a strip of copper mechanically with my hand through a uniform magnetic field will their be a drift velocity? And if so will the drift velocity be in the same direction as the moving copper strip? What would the magnitude of the drift velocity be if this happens? Can you have a drift...

OK, we had Hall-effect equivalent for photons. And now there is Hall effect for phonons! http://physicsweb.org/articles/news/9/10/5/1 Zz.

Hi there, I am currently learning about the quantum hall effect and am a bit confused about the edge states picture and how this fits in with the rest of the theory. In most books/review texts the theory is dicussed from the point of view of an infinite 2D system the magneteic field collapses...

Hall Effect! Relocated Hey guys, I'm having a little confusion. Have spent too much time in trying to work through this. . . In performing the Hall Effect experiment, I took data of the Hall voltage versus Temperature. I performed this three times for different fixed B, magnetic fields. The...

Hall Effect! Hey guys, I'm having a little confusion. Have spent too much time in trying to work through this. . . In performing the Hall Effect experiment, I took data of the Hall voltage versus Temperature. I performed this three times for different fixed B, magnetic fields. The...

hello, here is my second message.(and my English is still very bad) I don't understand these 3 little experiments(we need Helmholtz coils and a Hall Effect probe) I know I have to draw a graph for each situation but I can't interpret the difference between the theory and the experiment...