In semiconductor physics, the band gap of a semiconductor can be of two basic types, a direct band gap or an indirect band gap. The minimal-energy state in the conduction band and the maximal-energy state in the valence band are each characterized by a certain crystal momentum (k-vector) in the Brillouin zone. If the k-vectors are different, the material has an "indirect gap". The band gap is called "direct" if the crystal momentum of electrons and holes is the same in both the conduction band and the valence band; an electron can directly emit a photon. In an "indirect" gap, a photon cannot be emitted because the electron must pass through an intermediate state and transfer momentum to the crystal lattice. Examples of direct bandgap materials include amorphous silicon and some III-V materials such as InAs and GaAs. Indirect bandgap materials include crystalline silicon and Ge. Some III-V materials are indirect bandgap as well, for example AlSb. (Wikipedia).
Physics 60 Optics: Double Slit Interference (14 of 25) Find Distance from Central Max to 1st Min
Visit http://ilectureonline.com for more math and science lectures! . In this video I will find the distances from the central maximum to the 1st minimum and to the intensity is ½ of the central maximum.
From playlist PHYSICS 60 INTERFERENCE OF LIGHT
Physics 60 Optics: Double Slit Interference (9 of 25) Phase Difference Path Length
Visit http://ilectureonline.com for more math and science lectures! . In this video I will explain the phase difference of 2 light rays coming through a double slit.
From playlist PHYSICS 60 INTERFERENCE OF LIGHT
Physics 60 Optics: Double Slit Interference (2 of 25) Phase Difference and Double Slit
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain how phase difference is created by light traveling through a double slit.
From playlist PHYSICS 60 INTERFERENCE OF LIGHT
Physics 60 Optics: Double Slit Interference (12 of 25) Find Distance, Intensity to Central Maximum
Visit http://ilectureonline.com for more math and science lectures! . In this video I will find the distance and the intensity (at half-way) from the central maximum to the 1st minimum.
From playlist PHYSICS 60 INTERFERENCE OF LIGHT
Physics 60 Optics: Double Slit Interference (5 of 25) Finding the Intensity of Interference Pattern
Visit http://ilectureonline.com for more math and science lectures! In this video I will calculate the intensity of an interference pattern at any point along the screen.
From playlist PHYSICS 60 INTERFERENCE OF LIGHT
Physics 60 Interference of Light (1 of 8) Path and Phase Difference: Introduction
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to find the intensity of double source interference pattern.
From playlist PHYSICS - OPTICS
Physics 60 Optics: Double Slit Interference (3 of 25) Constructive and Destructive Interference
Visit http://ilectureonline.com for more math and science lectures! In this video I will illustrate and explains how phase difference creates constructive and destructive interference.
From playlist PHYSICS 60 INTERFERENCE OF LIGHT
Solid State Physics in a Nutshell: Topic 10-1: Thermal & Optical Excitations
Today, we develop a description of thermal and optical excitations in intrinsic semiconductors. We consider both direct and indirect transitions.
From playlist CSM: Solid State Physics in a Nutshell | CosmoLearning.org Physics
Mod-01 Lec-37 Semiconductors (Continued)
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
Introduction to Solid State Physics, Lecture 11: Band Structure of Electrons in Solids
Upper-level undergraduate course taught at the University of Pittsburgh in the Fall 2015 semester by Sergey Frolov. The course is based on Steven Simon's "Oxford Solid State Basics" textbook. Lectures recorded using Panopto, to see them in Panopto viewer follow this link: https://pitt.host
From playlist Introduction to Solid State Physics
Reduction in Band Gap with Retention of Ferroelectricity through Heterovalent ... Rohit Kumar Rohj
DISCUSSION MEETING : APS SATELLITE MEETING AT ICTS ORGANIZERS : Ranjini Bandyopadhyay (RRI, India), Subhro Bhattacharjee (ICTS-TIFR, India), Arindam Ghosh (IISc, India), Shobhana Narasimhan (JNCASR, India) and Sumantra Sarkar (IISc, India) DATE & TIME: 15 March 2022 to 18 March 2022 VEN
From playlist APS Satellite Meeting at ICTS-2022
Mod-01 Lec-35 Electron Dynamics in a Periodic Solid
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
6. Crystal Bonding & Electronic Energy Levels in Crystals
MIT 2.57 Nano-to-Micro Transport Processes, Spring 2012 View the complete course: http://ocw.mit.edu/2-57S12 Instructor: Gang Chen License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 2.57 Nano-to-Micro Transport Processes, Spring 2012
Light and Optics 7_2 Interference
Out of phase waves lead to interference.
From playlist Physics - Light and Optics
Continuous Mott transitions in a model Hamiltonian system by N S Vidhyadhiraja
29 May 2017 to 02 June 2017 VENUE: Ramanujan Lecture Hall, ICTS Bangalore This program aims to bring together people working on classical and quantum systems with disorder and interactions. The extensive exploration, through experiments, simulations and model calculations, of growing cor
From playlist Correlation and Disorder in Classical and Quantum Systems
Physics 60 Optics: Double Slit Interference (33 of 35) Position of the 1st Min of 4-Slit
Visit http://ilectureonline.com for more math and science lectures! . In this video I will find the position of the first minimum of a 4-slit interference pattern. Next video in series: http://youtu.be/thAZvWhV3ew
From playlist PHYSICS 60 INTERFERENCE OF LIGHT
Mod-06 Lec-13 Electrical Conduction in Ceramics (Contd. )
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
Mod-01 Lec-24 Electrical, Magnetic and Optical Properties of Nanomaterials
Nanostructures and Nanomaterials: Characterization and Properties by Characterization and Properties by Dr. Kantesh Balani & Dr. Anandh Subramaniam,Department of Nanotechnology,IIT Kanpur.For more details on NPTEL visit http://nptel.ac.in.
From playlist IIT Kanpur: Nanostructures and Nanomaterials | CosmoLearning.org
Parallel Waveguides using Photonic Crystals (Periodic Band Gap Structure) - FDTD Animation
This is the second of the series for the waveguiding structures using the periodic band gap materials (The first one is at: http://www.youtube.com/watch?v=gZkFVco4kL4). Here, two simultaneous simulations are shown. In the right one, both excitations are in-phase (cosine-cosine) whereas
From playlist Electromagnetic Animations
16. Fermi Golden Rule and Relaxation Time Approximation
MIT 2.57 Nano-to-Micro Transport Processes, Spring 2012 View the complete course: http://ocw.mit.edu/2-57S12 Instructor: Gang Chen License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 2.57 Nano-to-Micro Transport Processes, Spring 2012