PHYSICS GROUP - II ( 3110018 )

Free electron theory (3 Question),  Density of states and energy band diagrams,  Kronig-Penny model (to introduce origin of band gap), Energy bands in solids,  E-k diagram, Direct and indirect bandgaps (1 Question),  Types of electronic materials: metals, semiconductors, and insulators,  Density of states, Occupation probability,  Fermi level, Effective mass, Phonons. (1 Question), 

Intrinsic and extrinsic semiconductors (1 Question),  Dependence of Fermi level on carrier-concentration and temperature (equilibrium carrier statistics) (1 Question),  Carrier generation and recombination, Carrier transport: diffusion and drift, p-n junction (1 Question),  Metal-semiconductor junction (Ohmic and Schottky), Semiconductor materials of interest for optoelect (1 Question), 

Optical transitions in bulk semiconductors: absorption, spontaneous emission, and stimulated emissio,  Joint density of states (1 Question),  Density of states for photons (1 Question),  Transition rates (Fermi's golden rule),  Optical loss and gain; Photovoltaic effect, Exciton (2 Question),  Drude model (1 Question), 

Four-point probe and Van Der Pauw measurements for carrier density (3 Question),  Resistivity and hall mobility,  Hot-point probe measurement, capacitance-voltage measurements,  Parameter extraction from diode I-V characteristics, DLTS,  band gap by UV-Vis spectroscopy, absorption/transmission (2 Question), 

Introduction of Superconductivity,  Properties of superconductor (2 Question),  Effect of magnetic field (1 Question),  Meissner effect,  Pressure effect,  Impurity effect,  Isotopic mass effect,  Penetration depth : Magnetic field (1 Question),  Josephson's junction and its application Application of superconductors (2 Question),