INFORMATION STORAGE BY CHANGING THE VALENCE STATE OF A SEMI-CONDUCTOR CRYSTAL

摘要

An information storage system includes a semi-conductor crystal having deep level donors and multi-valent particles dispersed through it. Information is written into the system by subjecting the crystal to electro-magnetic radiation and thereby causing reciprocal changes in the valence states of the respective donors and multi-valent particles. Information is read by subjecting the crystal to radiation that is absorbed by ions in one of the valence states.