Experiments during Wintersemester 2018
E-Mail: r.walter (at) pi4.uni-stuttgart.de
Room: 1.909 Tel.: 64871
Quantum Analogs is an acoustical experiment designed to explain wave mechanics. The basis of the experiment is the analogy between the mathematical description of an electron in a potential (Schrödinger equation) und the behavior of ordinary sound waves in air (Helmholtz equation). The major advantage of acoustical experiments hereby is that sound-phenomena appear on an accessible time and length scale for humans. The experimental setup allows to investigate acoustical analogies with one- and three-dimensional quantum mechanical systems. Acoustical analogues to the hydrogen atom and hydrogen molecule and the dispersion in one-dimensional acoustical semiconductors are examined.
Schrödinger equation, hydrogen atom, hydrogen molecule, Bragg condition, band gap, reciprocal space, dispersion relation, Brillouin zone, reduced zone scheme
Institute: 1. Physikalisches Institut
E-Mail: ievgen.voloshenko (at) pi1.physik.uni-stuttgart.de
Room: 1.518 Tel.: 64865
In the last 20 years atomic force microscopy has become next to scanning electron microscopy the second standard method for high-resolution microscopy. With a resolution in the nanometer range it surpasses diffraction-limited optical microscopes by a factor of 1000. Its greatest advantage compared to other high-resolution methods is that is does neither requires vacuum nor comple sample preparation.
In the lab you will learn the handling of the AFM with calibration samples and “everyday life samples”. The obtained pictures will then be edited and analyzed with an image processing software. Methods like 2-D Fourier filtering and the quantitative roughness analysis are the most important.
E-Mail: guo (at) pi5.physik.uni-stuttgart.de
Room: 1.934 Tel.: 64862
Optical pumping allows to probe atomic phenomena such as resonant light absorption, nuclear spin energy levels, Zeemann splitting and Rabi oscillations. The fundamental idea of optical pumping is to use polarized light to create an energy population distribution that is different from the Boltzmann distribution at a given temperature. In the experimental setup gaseous Rubidium is pumped, which has a hydrogen-like electronic configuration but consists of two isotopes with different nuclear spins leading to manifold lines.
E-Mail: mehmet-ali.nebioglu (at) pi1.physik.uni-stuttgart.de
Room: 1.550 Tel.: 64813
Ultrasonic methods play an important role in non-destructive materials testing and medical diagnostics. Propagation, reflection, attenuation and dispersion of soundwaves in liquids and solids are investigted in the experiment. Pulse-echo techniques are used at various frequencies for the characteriztion of material defects in test samples, to examine the sound velocities of longitudinal and transverse sound waves in solids and to determine the dispersion of lamb waves in thin plates.
Room: U 1.807
E-Mail: guilherme.gorgen-lesseux (at) pi1.physik.uni-stuttgart.de
Room: 1.543 Tel.: 64867