We report experimental evidence for the generation of ferroelectric polarization in an organic conductor -[bis(ethylenedithio)tetrathiafulvalene] 2 I 3 obtained by optical second-harmonic generation. The spontaneous polarization emerges along with a metal-to-insulator transition that is driven by the Wigner crystallization of electrons. The strong optical nonlinearity and its ultrafast photoresponse demonstrated by this study exemplify the nature of the ferroelectric polarization that originates from the electron ordering.

No abstract

This paper analyzesaluminum alloys that are used to form multilevel metallization in the submicron LSI/VLSI and magnetic alloys that are used for the production of magnetic disks of external storage devices with a large amount of memory. In addition characteristics of magnetron sputtering devices that can be used to form thinmetallization are given: magnetron sputtering device with a magnetic block rotated by cooling deionized water, which can significantly increase the effectiveness of sputtering; high-frequency magnetron device UMV 2,5 with magnetic system that formed on electromagnets with scanning magnetic field; magnetron sputtering device UVN MDE.P-1250-012 which can be used to form double-sided metallization; magnetron sputtering device based on URM.3.279.05 which can be used to form multilayer contact metallization.

This paper analyzes performance of bipolar transistors based on AlGaAs/GaAs heterostructures (HBT). Use of heterojunction as emitter junction allows radical improvement of its performance. Numerical simulation of HBT in ring oscillator mode showed that the delay of the BT with 1x2 µm emitter can be reduced to 8 ps at a maximum current of 105 A/cm2. HBT with one and two (emitter and collector) heterojunctions showed 24 ps delay at 9.1 mW and 17 ps at 40 mW.

No abstract