arXiv subjects

V. G. Karpov

Publications and source records attributed to V. G. Karpov.

20 records · Page 2Linked to original sources

arXiv2011

Electric field induced nucleation: An alternative pathway to metallic hydrogen

Electric field induced nucleation is introduced as a possible mechanism to realize a metallic phase of hydrogen. Analytical expressions are derived for the nucleation probabilities of both thermal and quantum nucleation in terms of material parameters, temperature, and the applied field. Our results show that the insulator-metal transition can be driven by an electric field within a reasonable temperature range and at much lower pressures than the current paradigm of P > 400 GPa. Both static and oscillating fields are considered and practical implementations are discussed.

cond-mat.mtrl-sci↗

arXiv2011

Thermodynamics of second phase conductive filaments

We present a theory of second phase conductive filaments in phase transformable systems; applications include threshold switches, phase change memory, and shunting in thin film structures. We show that the average filament parameters can be described thermodynamically. In agreement with the published data, the predicted filament current voltage characteristics exhibit negative differential resistance vanishing at high currents where the current density becomes a bulk material property. Our description is extendible to filament transients and allows for efficient numerical simulation.

cond-mat.mtrl-sci↗