Gunn effect
E708821
The Gunn effect is an electronic phenomenon in certain semiconductors where negative differential resistance leads to high-frequency oscillations and microwave generation under strong electric fields.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Gunn effect canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8021417 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Gunn effect Context triple: [Esaki–Tsu relation, relatedTo, Gunn effect]
-
A.
Segré–Silberberg effect
The Segré–Silberberg effect is a fluid dynamics phenomenon in which particles suspended in laminar flow through a circular tube migrate to stable equilibrium positions at a characteristic radial distance from the tube wall.
-
B.
Kapitza–Dirac effect
The Kapitza–Dirac effect is a quantum phenomenon in which a beam of particles, such as electrons or atoms, is diffracted by a standing wave of light, demonstrating the wave-particle duality of matter.
-
C.
Rubin–Ford effect
The Rubin–Ford effect is an observed large-scale motion of galaxies relative to the cosmic microwave background that provided early evidence for peculiar velocities and inhomogeneities in the universe’s expansion.
-
D.
de Sitter effect
The de Sitter effect is a relativistic phenomenon in celestial mechanics describing how general relativity alters the motion and precession of orbiting bodies in a gravitational field.
-
E.
Event Horizon
Event Horizon is a 1997 science fiction horror film about a rescue crew investigating a spaceship that disappeared into a black hole and returned with a malevolent presence.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Gunn effect Target entity description: The Gunn effect is an electronic phenomenon in certain semiconductors where negative differential resistance leads to high-frequency oscillations and microwave generation under strong electric fields.
-
A.
Segré–Silberberg effect
The Segré–Silberberg effect is a fluid dynamics phenomenon in which particles suspended in laminar flow through a circular tube migrate to stable equilibrium positions at a characteristic radial distance from the tube wall.
-
B.
Kapitza–Dirac effect
The Kapitza–Dirac effect is a quantum phenomenon in which a beam of particles, such as electrons or atoms, is diffracted by a standing wave of light, demonstrating the wave-particle duality of matter.
-
C.
Rubin–Ford effect
The Rubin–Ford effect is an observed large-scale motion of galaxies relative to the cosmic microwave background that provided early evidence for peculiar velocities and inhomogeneities in the universe’s expansion.
-
D.
de Sitter effect
The de Sitter effect is a relativistic phenomenon in celestial mechanics describing how general relativity alters the motion and precession of orbiting bodies in a gravitational field.
-
E.
Event Horizon
Event Horizon is a 1997 science fiction horror film about a rescue crew investigating a spaceship that disappeared into a black hole and returned with a malevolent presence.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
electronic phenomenon
ⓘ
transport phenomenon in semiconductors ⓘ |
| belongsToField |
semiconductor device physics
ⓘ
solid-state physics ⓘ |
| causes |
formation of high-field domains
ⓘ
propagating charge domains ⓘ |
| hasApplication |
electronic oscillators for communication systems
ⓘ
frequency generation without resonant circuits ⓘ laboratory microwave instrumentation ⓘ solid-state microwave sources ⓘ |
| hasConsequence |
domain transit-time oscillations
ⓘ
spatially inhomogeneous electric field distribution ⓘ |
| hasDiscoverer | J. B. Gunn NERFINISHED ⓘ |
| hasDiscoveryYear | 1963 ⓘ |
| hasFrequencyRange | microwave frequencies ⓘ |
| hasKeyParameter |
electron drift velocity-field characteristic
ⓘ
threshold electric field ⓘ |
| hasTypicalFrequencyRange | from a few GHz to tens of GHz ⓘ |
| isBasedOn |
intervalley electron transfer
ⓘ
transfer of electrons to higher-energy satellite valleys ⓘ |
| isDifferentFrom |
avalanche breakdown
ⓘ
tunnel diode negative resistance ⓘ |
| isExplainedBy | negative slope region of velocity–field curve ⓘ |
| isModeledBy | Ridley–Watkins–Hilsum theory NERFINISHED ⓘ |
| isNamedAfter | J. B. Gunn NERFINISHED ⓘ |
| isObservedUnder |
constant voltage bias
ⓘ
proper sample length and contact configuration ⓘ |
| isUtilizedIn |
Gunn diodes
NERFINISHED
ⓘ
local oscillators in receivers ⓘ microwave oscillators ⓘ microwave signal generators ⓘ radar speed guns ⓘ |
| leadsTo |
current oscillations
ⓘ
voltage oscillations ⓘ |
| occursIn |
certain compound semiconductors
ⓘ
gallium arsenide (GaAs) NERFINISHED ⓘ indium phosphide (InP) ⓘ other III-V semiconductors ⓘ |
| occursInDeviceRegion | bulk of the semiconductor ⓘ |
| requiresBias | dc bias above threshold field ⓘ |
| requiresCondition | strong electric field ⓘ |
| requiresMaterialProperty |
multi-valley conduction band
ⓘ
suitable intervalley energy separation ⓘ |
| requiresProperty | negative differential resistance ⓘ |
| resultsIn |
high-frequency oscillations
ⓘ
microwave generation ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Gunn effect Description of subject: The Gunn effect is an electronic phenomenon in certain semiconductors where negative differential resistance leads to high-frequency oscillations and microwave generation under strong electric fields.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.