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Casimir-Polder Interaction between an Atom and an Infinite Boundary in a Thermal Bath

Author: ZuoWuYing
Tutor: YuHongWei
School: Hunan Normal University
Course: Theoretical Physics
Keywords: Vacuum Fluctuation Radiation reaction Spontaneous excitation Level shift correction Unruh Effect
CLC: O412.1
Type: Master's thesis
Year: 2010
Downloads: 33
Quote: 0
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Abstract


Vacuum fluctuations and radiation reaction is considered to be caused by spontaneous emission and energy level of the physical origin of the movement, but they do exist uncertainty. Spontaneous emission and energy levels of both the mobile can be interpreted as the result of vacuum fluctuations can also be interpreted as the result of the radiation reaction can also be interpreted as a combination of both. Dalibard, Dupont-Roc and Cohen-Tannoudji (DDC) proposed symmetrical sort of atomic and field operators in the interaction Hamiltonian method can eliminate this uncertainty, and the vacuum fluctuations and radiation reaction independent physical significance. Placed on a plane of the conductor in free space, the plane of the conductor be vacuum fluctuations produce modified, and lead to some interesting quantum phenomena, such as Casimir and Casimir-Polder force, quantum light cone fluctuations of atomic radiation properties in cavity correction. Casimir-Polder force not only in the theoretical study of great significance, and are becoming increasingly important in the practical applications of nanoscience, chemical identification of surface atoms, biomimetic dry adhesive. The case of the electromagnetic field of the stationary atom Casimir-Polder force accelerated atomic and thermal library compared, it was found accelerate the atom is not exactly the same in the Unruh temperature thermal library still atomic. In order to explore the above conclusion still holds in the case of the scalar field, we will calculate the Casimir-Polder interaction between stationary atoms and planar boundary in this case hot library. First, consider an infinity near the plane of the conductor accelerated two-level atom situation and discuss in detail the z, respectively, to meet up close the distance between the low-acceleration and high acceleration limit ground state atoms and the plane of the conductor, the middle-distance and long-distance conditions when boundary amendment to the Atomic Energy class mobile. Secondly, we study when the atom is in a stationary library Unruh temperature thermal conductor boundary correction level shifts of the ground state atoms. In the limit of low temperature and high temperature were also taken into account the distance between the ground state atoms and conductor plane z meet up close, the boundary conditions of the middle-distance and long-distance amendment to the Atomic Energy level mobile. Inertial frame to accelerate atomic level moving amendment thermal reservoir atomic energy level mobile correction for comparison, the following conclusions: low acceleration limit (low temperature limit), both at close range, in the distance when the lead is consistent both in the distance, but the thermal correction term; completely different. High acceleration limit (high temperature limit), accelerate the atomic energy levels of the atoms and the Unruh temperature thermal reservoir mobile correction in the case of various distances showed inconsistent. Therefore, the uniformly accelerated atoms in free space as in the inertial atom in a thermal reservoir, but when the space in the presence of the border, the uniformly accelerated atoms, not the library and Unruh temperature thermal atoms consistent performance

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