INSTITUTE OF SOLID STATE PHYSICS
RUSSIAN ACADEMY OF SCIENCES

SPECIALITY 01.04.07 -ˆà CONDENSED MATTER PHYSICS

Approved by Scientific Council of Institute of Solid State Physics,
Russian Academy of Sciences
28 February, 2005

Chairman
Prof. V.V.Kveder

Proceedings No.4ˆàˆà

ADMISSION EXAMINATION PROGRAM
SPECIALITY 01.04.07 - CONDENSED MATTER PHYSICS

1. General Physics

1. Mechanics

Main kinematic characteristics of particle motion

2. Electricity and Magnetics
3. Optics and Acoustics
4. Quantum Mechanics and Structure of Matter
5. Thermodynamics and Statistical Physics

1. Bonding Forces in Solids

Atomic electron structure. Chemical bond and valence. Types of bonding force in condensed matter: Van der Waals bond, ionic bond, covalent bond, metallic bond.
Chemical bond and short-range order. Structure of matter with unidirectional interaction. Samples of close packed arrangement crystal structures: BCC, FCC, HCPˆàˆà , CsClòÀÓ, NaCl-types , CaTiO₃ perovskite -type structure.

Main properties of covalent bond. Covalent bond structure of matter. Selenium-type structure. Hybridization of atomic orbits in molecules and crystals. Diamond- and graphite-type structure.

2. Solid State Symmetry

Crystalline and amorphous solids. Translational invariance. Basis and crystalline structure. Unit cell. Wigner-Seitz cell. Bravais lattice. Angle, direction and plane notations in crystals. Reciprocal lattice and its properties. Brillouin zone.

Elements of crystal symmetry: rotations, reflections, inversion, inversion rotation, translation. Symmetry transformation operations. Group theory, symmetry groups. Possible orders of rotation axes in crystals. Spatial and point groups (crystal classes). Classification of Bravais lattices.

3. Defects in Solids

Point defects, their formation and diffusion. Vacancies and interstitial atoms. Frenkel pairs and Schottky defects.

Linear defects. Edge and screw dislocations. Role of dislocations in plastic deformation.

4. Crystal Diffraction

Wave propagation in crystals. X-ray, neutron and electron diffraction in crystals. Elastic and inelastic scattering. Bragg reflection. Atomic and structural factors. Diffraction on amorphous materials.

5. Lattice Vibrations

Crystal lattice vibrations. Equations of atomic motion. Simple and complex one-dimensional atomic chains. Elastic wave dispersion law. Acoustical and optical vibrations. ˆàVibration quantization. Phonons. Electron-phonon interaction.

6. Thermal Properties of Solids

Heat capacity of solids. Lattice heat capacity. Heat capacity of electrons. Temperature dependence of lattice and electron heat capacity. Classical specific heat theory. Law of equalized distribution of energy by degrees of freedom in classical physics. Limits of validity of classical theory.

Einstein and Debye quantum theory of specific heats. Limiting cases of high and low temperatures. Thermal expansion of solids, its physical origin. Anharmonic vibrations.

Lattice and electron heat conductivity. Wiedemann-Franz law for electron heat capacity and heat conductivity.

7. Electron Properties of Solids

Electron properties of solids: main experimental factors. Conductivity, Hall effect, thermal electromotive force, optical absorption. Problems of explanation by classical Drude-Lorentz theory.

Main approximations of zone theory. Born òÀÓKarman boundary conditions. Bloch theorem. Bloch functions. Quasi-impulse. Brillouin zones. Energy zones. Bragg electron reflection during crystal motion. Band energy spectrum. Tight binding electron approximation. Interaction of allowed band width with overlap of atomic wave ˆàfunctions. Dispersion law. Tensor of inverse effective mass.

Almost free-electron approximation. Bragg electron reflection. Electron filling of energy zones. Fermi surface. State density. Metals, dielectrics and semiconductors. Semimetals.

8. Magnetic Properties of Solids.

Magnetization and susceptibility. Diamagnets, paramagnets and ferromagnets. Curie- and Curie-Weiss laws. Paramagnetism and diamagnetism of electron conductivity.

Ferromagnetism nature. Phase transition into ferromagnetic state. Role of exchange interaction. Curie point and susceptibility of ferromagnets. Ferromagnetic domains. Reasons for domain occurrence. Bloch and Neel domain boundaries.

Anti-ferromagnets. Magnetic structure. Neel point. Anti-ferromagnets susceptibility. Ferromagnets. Magnetic structure of ferromagnets. Spin waves, magnons. Motion of magnetic moment in constant and variable fields. Electron paramagnetic resonance. Nuclear magnetic resonance.

9. Optical and Magnetooptical Properties of Solids

Complex permeability and optical constants. Absorption and reflection ratios. Kramers-Kronig relation.

Light absorption in semiconductors (interband and impurity absorption, free carrier and lattice absorption). Determination of main semiconductor properties by optical experiments.

Magnetooptical effects: (Faraday, Voigtˆà and Kerr effects).

Penetration of high frequency field into conductor. Normal and anomalous skin effects. Skin layer thickness.

10. Superconductivity

Superconductivity. Critical temperature. High temperature superconductors. Meissner effect. Critical field and critical current. Types I and II superconductors. Their magnetic properties. Abrikosov vortices. Magnetic field penetration depth in sample. Josephson effect.

Cooper pairing. Coherence length. Energy gap.