d is the width of the metal slab. Following is the derivation of Hall-effect: (at equilibrium, force is downwards due to magnetic field which is equal to upward electric force) Where, VH is Hall voltage. The Lorentz classical theory can’t explain the interaction theory and further the splitting of energy levels. It is a simple consequence of the motion of charged particles in a magnetic ﬁeld. Lecture 2 - Hall effect, a.c. conductivity Lecture 3 - Electromagnetic wave propagation in a metal, plasma frequency, thermal conductivity and thermoelectric effect Lecture 4 - The Sommerfeld model for electrons in a metal, the ideal quantum gas of fermions, ground state … The purpose of this book is to discuss and explain how modern ion and Hall thrusters work by describing the fundamental physics of these devices. Hall effect, development of a transverse electric field in a solid material when it carries an electric current and is placed in a magnetic field that is perpendicular to the current. An excellent, detailed but highly readable explanation can be found in "The Hall Effect Sensors; … Consider a rectangular slab that carries a current I in the X-direction. This makes the lower face negative. ,4th ed.NJ: Pearson/Prentice Hall, 2005, pp. Feedback . HALL effect - SemiConductors - and it's Applications - Engineering Physics 1. The original, classical Hall eﬀect was discovered in 1879 by Edwin Hall. The Michelson interferometer produces interference fringes by splitting a beam of monochromatic light so that one beam strikes a fixed mirror and the other a movable mirror. If both holes and electrons are conduction carriers, then a different derivation has to be done to solve for Hall coefficient. This is a challenging task requiring a basic knowledge of plasma physics, ion accelerators, cathodes, electrical The intensity pattern formed on a screen by diffraction from a square aperture. It is well established that the Hall-effect results from the interaction of charged particles, like electrons, in response to electric and magnetic fields. This demonstration shows Hall effect in semiconductor materials and shows how n-type and p-type semiconductors can be identified. Conduction by holes is studied later in Condensed Matter Physics. Intrinsic semiconductors: carrier concentration, derivation of electron concentration in conduction band, expression for hole concentration in valence band, intrinsic carrier Compton effect is defined as the result which is obtained when the X-rays are scattered on the material based on their increase in wavelength. Hall Effect definition. Sign in to view the content . Similarly the deficiency of electrons make the upper face positive. When the reflected beams are brought back together, an interference pattern results. Missed the LibreFest? Since the material has to be neutral, same amount of charge with opposite sign (-) appears on the other side of the slab (side \(B\)). ... Electromagnetic field theory has allowed a more refined interpretation of the physics responsible for the Hall effect. This effect is known as Hall effect. 3: Hall effect geometry again; the strip has a thickness δ, length l, and height h. Obtain the expression for Hall voltage in terms of Hall co-efficient (6 marks). The large number of interfering rays produces an interferometer with extremely high resolution, somewhat like the multiple slits of a diffraction grating increase its resolution. Source of this negative charge on side B is negatively charged dopant ions. c. Define Fermi factor. An external magnetic flux density (\(B_z\)) is applied in z direction, resulting a Lorentz force in –y direction for holes and electrons (due to negative charge of electrons). Hall Effect was named after Edwin Hall, its discoverer. Engineering Physics by Dr. Amita Maurya, Peoples University, Bhopal. This is somewhat similar to Fleming’s right hand rule. 1 – Photo of Edwin H. Hall – Discovered Hall Effect PrincipleIn 1879, he discovered that when a current carrying conductor/ semiconductor is placed perpendicularly to a magnetic field, a voltage is generated that could be measured at right angles to the current path. This looks like a completely classical derivation. Theory . If a material with a known density of charge carriers n is placed in a magnetic field and V is measured, then the field can be determined from Equation \ref{11.29}. •Solid-State Physics, 4ed, by H. Ibach and H. Luth, Springer-Verlag Another very popular book on the subject, with quite a bit of information in it. Hall Effect, Diffusion Gerhard Klimeck gekco@purdue.edu Klimeck –ECE606 Fall 2012 –notes adopted from Alam Outline 2 1) High Field Mobility effects 2) Measurement of mobility 3) Hall Effect for determining carrier concentration 4) Physics of diffusion 5) Conclusions REF: ADF, Chapter 5, pp. When a current carrying conductor I is placed in a transverse magnetic field B , an electric field E is induced in the conductor perpendicular to both I and B . For the Love of Physics - Walter Lewin - May 16, 2011 - Duration: 1:01:26. Electromagnetic principle has now further explained the science behind Hall Effect with a much better appreciation. Relation in (6) enables mobility measurements of majority carriers for single carrier materials. Flowing in the X-direction drawbacks of QFET, Hall effect physics involves a metal body contains! Physics - Walter Lewin - May 16, 2011 - Duration: 1:01:26 I flow the... 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