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- Ridley–Watkins–Hilsum_theory abstract "In solid state physics the Ridley–Watkins–Hilsum theory (RWH) explains the mechanism by which differential negative resistance is developed in a bulk solid state semiconductor material when a voltage is applied to the terminals of the sample. It is the theory behind the operation of the Gunn diode as well as several other microwave semiconductor devices, which are used practically in electronic oscillators to produce microwave power. It is named for British physicists B. K. Ridley, Tom Watkins and Cyril Hilsum who wrote theoretical papers on the effect in 1961.Negative resistance oscillations in bulk semiconductors had been observed in the laboratory by J. B. Gunn in 1962, and were thus named the "Gunn effect", but physicist Herbert Kroemer pointed out in 1964 that Gunn's observations could be explained by the RWH theory.In essence, RWH mechanism is the transfer of conduction electrons in a semiconductor from a high mobility valley to lower-mobility, higher-energy satellite valleys. This phenomenon can only be observed in materials that have such energy band structures.Normally, in a conductor, increasing electric field causes higher charge carrier (usually electron) speeds and results in higher current consistent with Ohm's Law. In a multi-valley semiconductor, though, higher energy may push the carriers into a higher energy state where they actually have higher effective mass and thus slow down. In effect, carrier velocities and current drop as the voltage is increased. While this transfer occurs, the material exhibits a decrease in current – that is, a negative differential resistance. At higher voltages, the normal increase of current with voltage relation resumes once the bulk of the carriers are kicked into the higher energy-mass valley. Therefore the negative resistance only occurs over a limited range of voltages.Of the type of semiconducting materials satisfying these conditions, gallium arsenide (GaAs) is the most widely understood and used. However RWH mechanisms can also be observed in indium phosphide (InP), cadmium telluride (CdTe), zinc selenide (ZnSe) and indium arsenide (InAs) under hydrostatic or uniaxial pressure.".
- Ridley–Watkins–Hilsum_theory wikiPageExternalLink milestones.html.
- Ridley–Watkins–Hilsum_theory wikiPageExternalLink milestones.html&date=2009-10-26+02:16:49.
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- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Cadmium_telluride.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Category:Electronic_engineering.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Charge_carrier.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Cyril_Hilsum.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Effective_mass_(solid-state_physics).
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Electric_field.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Electron_mobility.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Electronic_band_structure.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Electronic_oscillator.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Energy_band.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Gallium_arsenide.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Gunn_diode.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Herbert_Kroemer.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Indium_arsenide.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Indium_phosphide.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink J._B._Gunn.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Microwave.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Negative_resistance.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Ohms_Law.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Ohms_law.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Physica_Status_Solidi.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Physica_Status_Solidi_A.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Prentice_Hall.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Proceedings_of_the_IEEE.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Semiconductor.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Solid-state_physics.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Solid_state_physics.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLink Zinc_selenide.
- Ridley–Watkins–Hilsum_theory wikiPageWikiLinkText "Ridley–Watkins–Hilsum theory".
- Ridley–Watkins–Hilsum_theory hasPhotoCollection Ridley–Watkins–Hilsum_theory.
- Ridley–Watkins–Hilsum_theory wikiPageUsesTemplate Template:Cite_book.
- Ridley–Watkins–Hilsum_theory wikiPageUsesTemplate Template:Cite_journal.
- Ridley–Watkins–Hilsum_theory wikiPageUsesTemplate Template:Cite_web.
- Ridley–Watkins–Hilsum_theory wikiPageUsesTemplate Template:Physics-stub.
- Ridley–Watkins–Hilsum_theory wikiPageUsesTemplate Template:Reflist.
- Ridley–Watkins–Hilsum_theory subject Category:Electronic_engineering.
- Ridley–Watkins–Hilsum_theory comment "In solid state physics the Ridley–Watkins–Hilsum theory (RWH) explains the mechanism by which differential negative resistance is developed in a bulk solid state semiconductor material when a voltage is applied to the terminals of the sample. It is the theory behind the operation of the Gunn diode as well as several other microwave semiconductor devices, which are used practically in electronic oscillators to produce microwave power. It is named for British physicists B. K.".
- Ridley–Watkins–Hilsum_theory label "Ridley–Watkins–Hilsum theory".
- Ridley–Watkins–Hilsum_theory sameAs m.03mdqf2.
- Ridley–Watkins–Hilsum_theory sameAs Q7333030.
- Ridley–Watkins–Hilsum_theory sameAs Q7333030.
- Ridley–Watkins–Hilsum_theory wasDerivedFrom Ridley–Watkins–Hilsum_theory?oldid=650538924.
- Ridley–Watkins–Hilsum_theory isPrimaryTopicOf Ridley–Watkins–Hilsum_theory.