The Schottky effect or field enhanced thermionic emission is a phenomenon in condensed matter physics named after Walter H. Schottky. In electron emission devices, especially electron guns, the thermionic electron emitter will be biased negative relative to its surroundings. This creates an electric field of magnitude F at the emitter surface. Without the field, the surface barrier seen by an escaping Fermi-level electron has height W equal to the local work-function. The electric field lowers the surface barrier by an amount ΔW, and increases the emission current. It can be modeled by a simple modification of the Richardson equation, by replacing W by (W − ΔW). This gives the equation where J is the emission current density, T is the temperature of the metal, W is the work function of the metal, k is the Boltzmann constant, qe is the Elementary charge, ε0 is the vacuum permittivity, and AG is the product of a universal constant A0 multiplied by a material-specific correction factor λR which is typically of order 0.5. Electron emission that takes place in the field-and-temperature-regime where this modified equation applies is often called Schottky emission. This equation is relatively accurate for electric field strengths lower than about 108 V m−1. For electric field strengths higher than 108 V m−1, so-called Fowler–Nordheim (FN) tunneling begins to contribute significant emission current. In this regime, the combined effects of field-enhanced thermionic and field emission can be modeled by the Murphy–Good equation for thermo-field (T-F) emission. At even higher fields, FN tunneling becomes the dominant electron emission mechanism, and the emitter operates in the so-called "cold field electron emission (CFE)" regime. Thermionic emission can also be enhanced by interaction with other forms of excitation such as light. For example, excited Cs-vapours in thermionic converters form clusters of Cs-Rydberg matter which yield a decrease of collector emitting work function from 1.5 eV to 1.0–0.7 eV. Due to long-lived nature of Rydberg matter this low work function remains low which essentially increases the low-temperature converter’s efficiency. (Wikipedia).
Schrödinger Equation : its impact on the electron and the atom
The Schrödinger Equation is fundamental to the quantum behaviour of the atom, and quantum mechanics in general. But what is it all about? In this video I discuss what it means, without delving too deeply in the mathematics, and how it helps understand the nature of the electron in the atom
From playlist New here? A selection of what I do
Teach Astronomy - Doppler Effect
http://www.teachastronomy.com/ The Doppler Effect is the shift of wavelength or frequency of a source of waves due to the motion of that source of waves. Doppler Effect is most familiar in terms of sound waves. As a source of sound, such as a siren, approaches you, the pitch or frequency
From playlist 06. Optics and Quantum Theory
The 10 Most Important Physics Effects
A count-down of the 10 most important effects in physics that you should all know about: 10: The Doppler Effect (for sound and light) 9. The (real!) Butterfly Effect 8. The Meissner-Ochsenfeld Effect The video is from here: https://www.youtube.com/watch?v=Rokoid75KxI 7. The Aharonov-
From playlist Physics
Dealing with Schrodinger's Equation - The Hamiltonian
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From playlist Quantum Mechanics
Imagine you are standing in the middle of a road and a car is coming towards you. The driver sounds the horn so that nothing unpleasant happens, and you hear the horn very loudly, at a high pitch, and step out of the way. However, as the car moves away from you, the sound of the horn seems
From playlist Theory to Reality
AWESOME Physics demonstration. Coriolis effect (explained)!!!
The Coriolis effect refers to the apparent deflection of objects (such as airplanes, wind, missiles, and ocean currents) moving in a straight path relative to the Earth's surface. Its strength is proportional to the speed of the Earth's rotation at different latitudes. For example, a plane
From playlist MECHANICS
Molecularly Controlled Semiconductor Interfaces by Ayelet Vilan
Modern Trends in Electron Transfer Chemistry: From Molecular Electronics to Devices URL: https://www.icts.res.in/discussion-meeting/MTETC2016 DATES: Thursday 28 Jan, 2016 - Friday 29 Jan, 2016 VENUE : Madhava Lecture Hall, ICTS Bangalore DESCRIPTION: The meeting aims to introduce stud
From playlist Modern Trends in Electron Transfer Chemistry: From Molecular Electronics to Devices
Lec 19 | MIT 3.091SC Introduction to Solid State Chemistry, Fall 2010
Lecture 19: Point & Line Defects Instructor: Donald Sadoway View the complete course: http://ocw.mit.edu/3-091SCF10 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 3.091SC Introduction to Solid State Chemistry, Fall 2010
Lec 19 | MIT 3.091 Introduction to Solid State Chemistry
Defects in Crystals: Point Defects, Line Defects, Interfacial Defects, Voids View the complete course at: http://ocw.mit.edu/3-091F04 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 3.091 Introduction to Solid State Chemistry, Fall 2004
Mod-01 Lec-38 Defects in Solids - Point Defects
Condensed Matter Physics by Prof. G. Rangarajan, Department of Physics, IIT Madras. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist NPTEL: Condensed Matter Physics - CosmoLearning.com Physics Course
Mod-03 Lec-07 Defects in crystalline solids
Advanced ceramics for strategic applications by Prof. H.S. Maiti,Department of Metallurgy and Material Science,IIT Kharagpur.For more details on NPTEL visit http://nptel.ac.in
From playlist IIT Kharagpur: Advanced Ceramics for Strategic Applications | CosmoLearning.org Materials Science
Physics - Ch 66 Ch 4 Quantum Mechanics: Schrodinger Eqn (17 of 92) How to Use Schrod. Eqn: 2
Visit http://ilectureonline.com for more math and science lectures! In this video I will show how to use the Schrodinger's equation, part 2/2. Next video in this series can be seen at: https://youtu.be/kO9JZgVXqyU
From playlist PHYSICS 66.1 QUANTUM MECHANICS - SCHRODINGER EQUATION
Tobias Weich: Resonance chains on Schottky surfaces
Find this video and other talks given by worldwide mathematicians on CIRM's Audiovisual Mathematics Library: http://library.cirm-math.fr. And discover all its functionalities: - Chapter markers and keywords to watch the parts of your choice in the video - Videos enriched with abstracts, b
From playlist SPECIAL 7th European congress of Mathematics Berlin 2016.
Magnetocrystalline anisotropy in Ce-compounds by Arumugam Thamizhavel
Program The 2nd Asia Pacific Workshop on Quantum Magnetism ORGANIZERS: Subhro Bhattacharjee, Gang Chen, Zenji Hiroi, Ying-Jer Kao, SungBin Lee, Arnab Sen and Nic Shannon DATE: 29 November 2018 to 07 December 2018 VENUE: Ramanujan Lecture Hall, ICTS Bangalore Frustrated quantum magne
From playlist The 2nd Asia Pacific Workshop on Quantum Magnetism
The Doppler Effect explained visually
A concise visual explanation to better understand the physics behind the Doppler effect. For more videos, subscribe to the YouTube channel : https://www.youtube.com/ScienceClicEN And if you liked this video, you can share it on social networks ! To support me on Patreon : http://www.patr
From playlist Movement
Schottky Diode Part 1 - Band Diagram
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From playlist Electronics I: Semiconductor Physics and Devices
Physics - Ch 66 Ch 4 Quantum Mechanics: Schrodinger Eqn (1 of 92) The Wave Equation
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain the Schrodinger equation used to describe the properties of motion, energy, and positions of small particles behaving more like photons than “real” particles. Next video in this series can be
From playlist PHYSICS 66.1 QUANTUM MECHANICS - SCHRODINGER EQUATION
Schottky Diode Part 2 - Depletion Region and Capacitance
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From playlist Electronics I: Semiconductor Physics and Devices
Day 19 Point defects in metals and ceramics
0:00 reading quiz 3:46 learning objectives and review of vacancies, self-interstitials 9:00 point defects in ceramics, Schottky vs Frenkel defects 11:28 energetic driving forces for and against vacancy formation 16:08 thermal expansion related to vacancy formation and lattice expansion 21:
From playlist Introduction to Materials Science and Engineering Fall 2017
An attempt at illustrating the Aharonov-Bohm effect
This is a first attempt at illustrating the Aharonov-Bohm effect, which is a non-local effect in quantum mechanics. In classical electrodynamics, the physically relevant quantities are the electric and magnetic fields. They can be expressed in terms of a scalar and a vector potential, but
From playlist Schrödinger's equation