We investigate, in the paradigm of open quantum systems, the dynamics of quantum coherence of a circularly accelerated atom coupled to a bath of vacuum fluctuating massless scalar field in a spacetime with a reflecting boundary. The master equation that governs the system evolution is derived. It is found that the quantum coherence diminishes to zero with increasing centripetal acceleration and evolution time in the case without a boundary. However, the presence of a boundary will modify the quantum fluctuations of the scalar field, which results in the enhancement of quantum coherence near the boundary compared with that for the unbounded case. Particularly, when the atom is very close to the boundary, although the atom still interacts with the environment, it behaves as if it were a closed system as a consequence of the presence of the boundary, and the quantum coherence can be shielded from the effect of the vacuum fluctuating scalar field.PACS numbers: 03.65.Yz, 03.67.Mn, 03.65.Ta

The transient response of the lateral photovoltaic effect (LPE) was observed when Ti-SiO2-Si structure was irradiated by a 650 nm laser at room temperature. The lateral photovoltage (LPV) was measured by voltmeter, which is linearly dependent on the laser irradiation position. In this paper, we described the dynamic process of LPE when Ti-SiO2-Si was irradiated by laser. The LPE has high sensitivity of 59mV/mm and linearity of 0.9924, respectively. Furthermore, the experimental phenomenon is explained by the carrier diffusion theory. And a resistor-capacitor (RC) circuits model combines with traditional LPE is established to simulate the transient response. These results suggest that the Ti-SiO2-Si structure is a potential choice for optoelectronic devices applied in the sensors field.