21. One model that estimates the properties of an electron gas at absolute zero in metals is the Fermi gas. 22. As a result, band bending is moving upward and the two-dimensional electrons gas does not appear. 23. This expression can be derived from the chemical potential for an electron gas and from Poisson's equation. 24. But, at the quantum Hall transition, the electron gas delocalizes as can be observed in the laboratory. 25. Electron gas is inviscid, so its velocity does not depend on the distance to the walls of the conductor.26. Instead of energy transfer, some models consider the electronic stopping power as momentum transfer between electron gas and energetic ion. 27. This expression is based on the homogeneous electron gas and, thus, is not very accurate for most physical systems. 28. If the temperature is extremely low, the behavior of the electrons comes close to the quantum mechanical model of a free electron gas . 29. Some of these are inconsistent with the uniform electron gas approximation, however, they must reduce to LDA in the electron gas limit. 30. Some of these are inconsistent with the uniform electron gas approximation, however, they must reduce to LDA in the electron gas limit.
