One-dimensional Physics Research Articles

Ground-state wave functionals for (1 + 1)-dimensional fermion field theories

We use path-integral methods to derive the ground-state wave functions of a number of two-dimensional fermion field theories and related systems in one-dimensional many-body physics. We derive the exact wave function for the Thirring-Luttinger and coset fermion models and apply our results to derive the universal behavior of the wave functions of the Heisenberg antiferromagnets and of the Sutherland model. We find explicit forms for the wave functions in the density and in the Grassmann representations. We show that these wave functions always have the Jastrow factorized form and calculated the exponent. Our results agree with the exponents derived from the Bethe ansatz for the Sutherland model and the Haldane-Shastri spin chain but apply to all the systems in the same universality class.

Optically driven photoconductive devices for power switching application. Part 2: Thermal modelling including heat sink

The removal of heat generated in power devices using a heat sink is increasingly important for packaging and reliability, particularly for the photoconductive circuit element (PCE) which can conduct a large current when used as a high power switch. The paper presents a thermal model for estimating the relationship between the temperature in a p+-i-n+ PCE and the required geometry of the heat sink under steady-state dark and illuminated operations. The model is based on a one-dimensional heat-transfer analysis and relevant semiconductor device physics. Given the bias condition, the geometry and the material for the PCE, and the material for the heat sink, the model can predict the area of the heat sink needed for a desired temperature in the device. Calculations for different semiconductor thicknesses, different metals (aluminum and copper), different semiconductors (Si and GaAs), different applied voltages, different levels of optical excitation and different device operations (turn-on and turn-off operations) are illustrated.

The one-dimensional physics of α-LiIO3

In order to draw the attention of international audience, this author writes up with new clarifications and in an integrated language the one-dimensional physics of α-LiIO3. The 1d accumulations of space charges along their passageways of the quasi 1d ionic flow in the c-direction give rise to the novel phenomena observed in the single crystal specimens under the action of a dc voltage.

Metallisch leitende Polymere ? Jagdgr�nde f�r Solitonen?

Polyacetylene is presented as the prototype of a metallic conducting polymer. The concepts of one-dimensional metal physics are illustrated and special attention is drawn to a structural defect called “soliton”. Electrical, magnetic, and optical experiments connected with solitons are discussed. The authors' opinion is expressed that present experimental results do not yet furnish strong evidence for the existence of solitons in polyacetylene, but that the soliton idea is a fruitful stimulus for further investigations and novel applications.

Physics in One Dimension

J Bernasconi and T Schneider (eds) 1981 Berlin: Springer ix + 368 pp price DM65 This volume which is the proceedings of the conference entitled 'Physics in one dimension', held at Fribourg in August 1980, contains the 26 invited papers and a small selection of the poster contributions. The particular value of this book is that it contains some very readable reviews from a wider range of topics in one-dimensional physics than is normally found in this field.

Injection of tritium pellets into a two-component tokamak reactor

This paper gives the results of a numerical study of the plasma physics parameters of a tokamak reactor into which the fuel components are fed by various methods: tritium in the form of solid pellets and deuterium in the form of high-energy neutrals by means of an injector. The study was carried out with the use of a one-dimensional space-time plasma physics model describing the energy and particle balances in the tokamak plasma. The authors have determined the dependences of the reactor parameters (Q, βφ etc.) on the tritium fuelling rate.

Effect of fuel pellet injection velocity on the energy parameters of a tokamak reactor

A numerical study of the effect produced on the performance of a tokamak reactor by injecting deuterium-tritium pellets is described. The research was carried out with a one-dimensional space-time plasma physics model describing the energy and particle balance in a tokamak reactor plasma subject to the combined effects of various transport processes, including anomalous processes. The energy parameters of the reactor are defined as functions of fuel consumption and the velocity and frequency of fuel pellet injection.