Landau–Pomeranchuk–Migdal effect
E334544
The Landau–Pomeranchuk–Migdal effect is a quantum electrodynamics phenomenon in which high-energy electrons and photons in dense media experience suppressed bremsstrahlung and pair production due to multiple scattering.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Landau–Pomeranchuk–Migdal effect canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3175508 — 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: Landau–Pomeranchuk–Migdal effect Context triple: [Lev Landau, knownFor, Landau–Pomeranchuk–Migdal effect]
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A.
Shubnikov–de Haas effect
The Shubnikov–de Haas effect is a quantum oscillatory phenomenon in the electrical resistance of conductors and semiconductors subjected to strong magnetic fields at low temperatures, used to probe their electronic structure and Fermi surface.
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B.
de Haas–van Alphen effect
The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
-
C.
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.
-
D.
Szilard–Chalmers effect
The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
-
E.
Lifshitz–Kosevich formula
The Lifshitz–Kosevich formula is a key theoretical expression in solid-state physics that describes how the amplitude of quantum oscillations in metals depends on temperature, magnetic field, and electronic properties.
- 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: Landau–Pomeranchuk–Migdal effect Target entity description: The Landau–Pomeranchuk–Migdal effect is a quantum electrodynamics phenomenon in which high-energy electrons and photons in dense media experience suppressed bremsstrahlung and pair production due to multiple scattering.
-
A.
Shubnikov–de Haas effect
The Shubnikov–de Haas effect is a quantum oscillatory phenomenon in the electrical resistance of conductors and semiconductors subjected to strong magnetic fields at low temperatures, used to probe their electronic structure and Fermi surface.
-
B.
de Haas–van Alphen effect
The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
-
C.
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.
-
D.
Szilard–Chalmers effect
The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
-
E.
Lifshitz–Kosevich formula
The Lifshitz–Kosevich formula is a key theoretical expression in solid-state physics that describes how the amplitude of quantum oscillations in metals depends on temperature, magnetic field, and electronic properties.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
physical phenomenon
ⓘ
quantum electrodynamics effect ⓘ |
| affectsParticle |
high-energy electrons
ⓘ
high-energy photons ⓘ |
| affectsProcess |
bremsstrahlung
ⓘ
electron–positron pair production ⓘ |
| appliesTo |
electrons
ⓘ
high-Z materials ⓘ photons ⓘ |
| category |
quantum interference phenomena
ⓘ
radiation processes in matter ⓘ |
| consequence |
modification of electromagnetic shower development
ⓘ
suppression of bremsstrahlung ⓘ suppression of pair production ⓘ |
| dependsOn |
formation length of radiation
ⓘ
scattering length in the medium ⓘ |
| describedIn | quantum electrodynamics textbooks ⓘ |
| energyRegime | ultra-high energies ⓘ |
| field |
astroparticle physics
ⓘ
high-energy physics ⓘ particle physics ⓘ quantum electrodynamics ⓘ |
| hasAbbreviation | LPM effect ⓘ |
| influences |
design of high-energy calorimeters
ⓘ
interpretation of ultra-high-energy cosmic ray data ⓘ radiation length at very high energies ⓘ |
| isSuppressionOf | standard Bethe–Heitler radiation rate ⓘ |
| namedAfter |
Arkady Migdal
ⓘ
Isaak Pomeranchuk ⓘ Lev Landau ⓘ |
| occursIn | dense media ⓘ |
| physicalMechanism | multiple scattering of charged particles ⓘ |
| predictionBy |
Isaak Pomeranchuk
ⓘ
Lev Landau ⓘ |
| refinementBy | Arkady Migdal ⓘ |
| regime | long formation zone compared to mean free path ⓘ |
| relatedConcept |
Bremsstrahlung
ⓘ
surface form:
Bethe–Heitler cross section
cosmic ray air showers ⓘ dielectric suppression of radiation ⓘ electromagnetic cascades ⓘ |
| scaleDependsOn |
material radiation length
ⓘ
medium density ⓘ |
| theoreticalBasis |
coherence over multiple scattering centers
ⓘ
quantum interference of radiation amplitudes ⓘ |
| usedIn | Monte Carlo simulations of particle showers ⓘ |
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: Landau–Pomeranchuk–Migdal effect Description of subject: The Landau–Pomeranchuk–Migdal effect is a quantum electrodynamics phenomenon in which high-energy electrons and photons in dense media experience suppressed bremsstrahlung and pair production due to multiple scattering.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.