
Academic Year:  2014/5 
Owning Department/School:  Department of Physics 
Credits:  6 
Level:  Intermediate (FHEQ level 5) 
Period: 
Semester 2 
Assessment Summary:  EX 100% 
Assessment Detail: 

Supplementary Assessment: 
PH20017  Mandatory Extra Work (where allowed by programme regulations) 
Requisites:  Before taking this unit you must (take PH10005 or take PH10053) and take PH10007 and take PH10008 and take PH20029 
Description:  Aims: The aims of this unit are to introduce students to the basic concepts and models of solid state physics, with an emphasis on crystalline, electronic and magnetic structure. Learning Outcomes: After taking this unit the student should be able to: * know the ways in which crystal structures are described formally and relate structures in real space to those in reciprocal space; * describe how Xray and neutron diffraction is related to the properties of the reciprocal lattice, and used in structural studies; * discuss why classical theories of electrons in solids fail, and why they have to be treated quantum mechanically; * explain the concept of density of states; * describe how allowed and forbidden energy bands arise as a result of crystal potentials and how the properties of electrons in allowed energy bands determine the electrical and optical behaviour; * appreciate the difference between metals, semiconductors and insulators; * discuss the factors that control the electrical conductivity of metals and semiconductors; * describe classical theories of diamagnetism, paramagnetism, and the ferromagnetic properties of materials; * describe how crystalline structures vibrate, and the associated theories of heat capacity. Skills: Numeracy T/F A, Problem Solving T/F A. Content: Crystal structures (5 hours): Translational symmetry; lattices and basis, Miller indices. Diffraction of waves in crystalline structures; Bragg law, the reciprocal lattice and Brillouin zones. Xray and neutron diffraction studies of crystal structures. Electrons in solids (7 hours): Classical Drude theory and its failures. The Hall effect. Quantum (Sommerfeld) theory. Density of states and the Fermi sphere. The effect of crystalline periodicity. Energy band diagrams and effective masses. The distinction between metals, semiconductors and insulators. Semiconductors (3 hours): Holes. Basic properties of intrinsic semiconductors; Hmodel of doped semiconductors, donors and acceptors. Magnetism (3 hours): Magnetic susceptibility. The origin of magnetic moments in solids. Classical models of diamagnetism and paramagnetism. Ferromagnetism and the exchange interaction. Lattice dynamics (4 hours): Optical and acoustic vibrations. Phonons. Classical and quantum theories of heat capacity. 
Programme availability: 
PH20017 is Compulsory on the following programmes:Department of Physics
PH20017 is Optional on the following programmes:Programmes in Natural Sciences
