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# Solid State Physics

### Overview

This course is designed to introduce the structure, electronic, and other fundamental properties of solids to the students. It is supposed to be the fundamental course on solid state physics, covering in details the representation of crystal structure, symmetries in solid, x-ray diffraction, bonding, transport properties, electronic structure, vibration of the lattice, outline of magnetism, and superconductivity. We will carefully develop the concepts in logical steps and solve problems, resulting in a concrete understanding of the topics. While a course covering these topics is mandatory in almost every university around the world for the Physics students, Chemistry and Electrical Engineering students interested in research of condensed matter physics may benefit from the course.INTENDED AUDIENCE : BSc third year, MSc first year PREREQUISITES : One should have some idea of quantum mechanics, statistical mechanics, vector algebra & calculus, and simple geometry.

### Syllabus

Module -1 : Structure of solids, Symmetry, Bravais lattices, Unit cell, Miller indices, Simple crystal structure, Reciprocal lattice, Laue equations and Bragg’s law, Brillouin Zones, Diffraction of x-rays, Atomic scattering and structure factors.
Module-2 : Bonding in solids, van der Waals and Repulsive interactions, Lennard Jones potential, Cohesive energy and compressibility, Ionic crystals, Madelung constant, Covalent crystals, Metals, atomic and ionic radii.
Module-3 : The Drude theory of metals: DC electrical conductivity of a metal; Hall effect and magnetoresistance; AC electrical conductivity of a metal and propagation of electromagnetic radiation in a metal; Thermal conductivity of a metal, The Sommerfeld theory of metals: Density of states; Fermi-Dirac distribution; Specific heat, thermal, and electrical conductivity of degenerate electron gases.
Module-4 : Free electron theory, Kronig-Penney Model, Crystal lattices: Periodic potential, Band theory, Tight binding, Classification of metals, insulators and semiconductors, Symmetry of energy bands, Density of state, Fermi surface.
Module-5 : Vibrations of one dimensional monoatomic and diatomic chain, Normal modes and Phonons, Phonon spectrum, Long wavelength acoustic phonons and elastic constants, specific heat capacity, Density of states, thermal expansion and conductivity, Phonons: Vibrational Properties, normal modes, acoustic and optical phonons.
Module-6 : Dia-, Para-, and Ferromagnetism, origin of magnetism, Langevin's theory of paramagnetism, Weiss Molecular theory
Module-7 : Superconductivity: Phenomenological description, BCS theory, thermodynamics, London equation, type-I and type-II superconductors, flux quantization, electron tunneling, Josephson effect.

### Taught by

Prof. Amal Kumar Das

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