Abstract We propose a new theoretical model of photorefractivity which consists of both electron and hole carriers with two deep traps and a shallow hole trap. The model predicts that,if the shallow trap accumulates a large density of charge carriers,the photoconductivity will be a sublinear (or superlinear) function of light intensity,and the space charge field will increase (or decrease) to a saturated value as the light intensity increases,depending on the sign of the dominant carrier. The comparison of this model with previous ones shows that it provides a more common description about the dependences of photoconductivi ty and space charge field on the light intensity.
Received: 24 June 1996
Revised: 06 January 1997
Accepted manuscript online:
PACS:
42.65.Hw
(Phase conjugation; photorefractive and Kerr effects)
Fund: Project supported by the National Natural Science Foundation of China and the Doctoral Foundation of the National Education Commission of China.
Cite this article:
LI YAN-QIU (李艳秋), LIU SHU-TIAN (刘树田), SUN WAN-JUN (孙万均), XU KE-BIN (许克彬), HONG JING (洪晶) THEORY OF PHOTOREFRACTIVE EFFECT FOR DOUBLE CARRIERS WITH TWO DEEP TRAPS AND A SHALLOW HOLE TRAP 1997 Acta Physica Sinica (Overseas Edition) 6 413
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
