Negative Microwave Conductivity in Solids.
Final rept. Sep 71-Mar 76,
CORNELL UNIV ITHACA N Y SCHOOL OF ELECTRICAL ENGINEERING
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The feasibility of obtaining bulk negative conductivity from a superlattice induced by a high intensity acoustic wave at 3 and 9 GHz in InSb was analyzed and tested. The result was negative due to excessive coupling of acoustic energy to the electron distribution. Technology for fabricating ultrafine gratings and surface superlattices by ion implantation has been perfected. An analysis of surface wave electromagnetic propagation to utilize the surface superlattice has been done. Single crystal ReO3 was examined for possible negative mass effects. New mechanisms for vapor growth of large single crystals of ReO3 were developed and the dc conductivity Hall effect, heat capacity, and magnetic susceptibility were measured. A Monte Carlo analysis of electron transport in superlattices was begun and led to successful studies supported by other grants of transient conduction behavior of GaAs and InP. A paper feasibility study of an electron interference technique for fabricating gratings in the range of 300-3000A has been made. Author
- Solid State Physics
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