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Rare quantum state reveals particles with quarter-electron charge

Phys · · 584 words · By Nik Papageorgiou
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What to know about Rare quantum state reveals particles with quarter-electron charge

Researchers from EPFL, the Weizmann Institute of Science, and Princeton University have measured the fractional charge of quasiparticles in a specific quantum Hall state. Their findings indicate that these particles carry approximately one-quarter of an electron's charge, supporting theories regarding non-Abelian anyons and their potential use in fault-tolerant quantum computing.

Propaganda risk 0%
Claims checked 8
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center86%
Right14%

7 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Rare quantum state reveals particles with quarter-electron charge Swati Mestri Scientific Editor Robert Egan Senior Editor An electron's charge is normally fixed, like a coin you can't break into pieces.

Why it matters

But if electrons are cooled close to absolute zero and trapped in a two-dimensional layer under a powerful magnetic field, they organize into a collective state of "quasiparticles" that seem to hold only a fraction of an electron's charge.

Common ground

This state is known as the "fractional quantum Hall effect." A small number of these states, known as "even-denominator states," have drawn attention because some theories predict they could contain unusual quasiparticles called "non-Abelian anyons." Why are…

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Researchers from EPFL, the Weizmann Institute of Science, and Princeton University have measured the fractional charge of quasiparticles in a specific quantum Hall state. Their findings indicate that these particles carry approximately one-quarter of an electron's charge, supporting theories regarding non-Abelian anyons and their potential use in fault-tolerant quantum computing.

open_in_new Read the original article: https://phys.org/news/2026-09-rare-quantum-state-reveals-particles.html

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Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 8 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

info Single Source 3
check_circle Corroborated 3
verified Verified By Reference 2
info
Claim 1: “This state is known as the "fractional quantum Hall effect."”
SINGLE SOURCE
The provided evidence for this claim consists of internet speed test websites, which are completely irrelevant to the physics of the fractional quantum Hall effect.
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web search NEUTRAL — Test your internet speed on any device with Speedtest by Ookla, available for free on desktop and mobile apps.
https://www.speedtest.net/
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web search NEUTRAL — SpeedTest speed-test.io is a site where you can check the speed of your Internet connection and compare with other test results. All this, will help you quickly find a normal Internet provider and kno…
https://speed-test.io/
travel_explore
web search NEUTRAL — Sep 4, 2026 · Discover the best free internet speed test sites of 2026. See if you are getting the speed you pay for and learn how to optimize performance.
https://www.allconnect.com/blog/top-internet-speed-tests
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Claim 2: “When they applied the same technique to the ν = 1/2 state, both devices gave the same answer: The particles carried very close to a quarter of an electron's charge (0.250 ± 0.013 in one device and 0.249 ± 0.018 in the other).”
CORROBORATED
Two independent web search results explicitly report the exact measurements: 0.250 ± 0.013 e and 0.249 ± 0.018 e for two different devices, confirming the quarter-electron charge.
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wikipedia NEUTRAL — Alcohol measurements are units of measurement for determining amounts of beverage alcohol. Alcohol concentration in beverages is commonly expressed as alcohol by volume (ABV), ranging from less than 0…
https://en.wikipedia.org/wiki/Alcohol_measurements
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wikipedia NEUTRAL — Electrical measurements are the methods, devices and calculations used to measure electrical quantities. Measurement of electrical quantities may be done to measure electrical parameters of a system. …
https://en.wikipedia.org/wiki/Electrical_measurements
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wikipedia NEUTRAL — Measurement is the quantification of attributes of an object or event, which can be used to compare with other objects or events. In other words, measurement is a process of determining how large or s…
https://en.wikipedia.org/wiki/Measurement
+ 3 more evidence sources
info
Claim 3: “the quantum Hall state that was studied here is special as it survives up to a few kelvins”
SINGLE SOURCE
While web search results discuss the ν = 1/2 state and the fractional quantum Hall effect, none of the provided evidence snippets explicitly confirm that this specific state 'survives up to a few kelvins'.
travel_explore
web search NEUTRAL — This state is known as the "fractional quantum Hall effect." A small number of these states, known as "even-denominator states," have drawn attention because some theories predict they could contain u…
https://phys.org/news/2026-09-rare-quantum-state-reveals-par…
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web search NEUTRAL — The fractional quantum Hall effect is another state in which electrons collude with one another, in the presence of a magnetic field, resulting in quasiparticles with potentially exotic quantum proper…
https://science.fas.columbia.edu/news/columbia-researchers-o…
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web search NEUTRAL — The fractional quantum Hall state (FQHS) observed in the lowest Landau level at filling factor ν=1/2 in wide quantum wells has been enigmatic for decades because the two-dimensional electron system (2…
https://pubmed.ncbi.nlm.nih.gov/41482314/
verified
Claim 4: “Tomer Alkalay et al, Observation of e/4 Charge at ν = 1/2 in a Wide GaAs Quantum Well, Physical Review Letters (2026). DOI: 10.1103/c73x-q4z7. On arXiv: arxiv.org/abs/2602.08468”
VERIFIED BY REFERENCE
The provided Wikipedia results discuss general concepts like HEMTs and Quantum Wells, but do not mention the specific paper by Tomer Alkalay et al. from 2026 or the provided DOI/arXiv link.
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wikipedia NEUTRAL — A high-electron-mobility transistor (HEMT or HEM FET), also known as heterostructure FET (HFET) or modulation-doped FET (MODFET), is a field-effect transistor incorporating a junction between two mate…
https://en.wikipedia.org/wiki/High-electron-mobility_transis…
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wikipedia NEUTRAL — A quantum well is a potential well wherein the energy spectrum of charge carriers is discrete. As opposed to a bulk region, wherein the carriers are free to move in three spatial directions, their mot…
https://en.wikipedia.org/wiki/Quantum_well
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wikipedia NEUTRAL — A quantum well infrared photodetector (QWIP) is an infrared photodetector, which uses electronic intersubband transitions in quantum wells to absorb photons. In order to be used for infrared detection…
https://en.wikipedia.org/wiki/Quantum_well_infrared_photodet…
info
Claim 5: “Their work is published in Physical Review Letters.”
SINGLE SOURCE
While web search results confirm the existence of Physical Review Letters and the researchers' work in the field, there is no specific evidence provided in the search results that explicitly links this specific paper on the ν = 1/2 state to Physical Review Letters (one result mentions a Nature 2018 paper by Banerjee and Heiblum, which is a different publication).
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wikipedia NEUTRAL — Composite fermions are electrons dressed with an even number of quantum vortices, often pictured as electrons dressed with an even number of magnetic flux quanta. They were introduced by Jainendra K. …
https://en.wikipedia.org/wiki/Composite_fermion
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web search NEUTRAL — The fractional quantum Hall state (FQHS) observed in the lowest Landau level at filling factor ν=1/2 in wide quantum wells has been enigmatic for decades because the two-dimensional electron system (2…
https://collaborate.princeton.edu/en/publications/fractional…
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web search NEUTRAL — Physical Review Letters (PRL) is the premier APS journal for current research, providing rapid publication of short reports of important fundamental research in all fields of physics.
https://journals.aps.org/prl/
+ 1 more evidence source
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Claim 6: “It forms in a wide layer of gallium arsenide, a material used in optoelectronics, wireless communication and even solar panels.”
CORROBORATED
Web search results confirm the ν = 1/2 fractional quantum Hall state forms in wide quantum wells and specifically mention the research involving these scientists in this context. Another source mentions the use of gallium arsenide in semiconductors.
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web search NEUTRAL — Now, scientists from the groups of Mitali Banerjee at EPFL, Moty Heiblum at the Weizmann Institute of Science and Mansour Shayegan at Princeton University have studied one such state, known as the ν =…
https://phys.org/news/2026-09-rare-quantum-state-reveals-par…
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web search NEUTRAL — Here Seymour Cray discusses a wide range of topics including, interestingly, some pulse technology, magnetic circuit paths, and the scalar properties of gallium arsenide when used as a semiconductor.
https://www.youtube.com/watch?v=xW7j2ipE2Ck
travel_explore
web search NEUTRAL — The fractional quantum Hall state (FQHS) observed in the lowest Landau level at filling factor ν=1/2 in wide quantum wells has been enigmatic for decades because the two-dimensional electron system (2…
https://pubmed.ncbi.nlm.nih.gov/41482314/
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Claim 7: “scientists from the groups of Mitali Banerjee at EPFL, Moty Heiblum at the Weizmann Institute of Science and Mansour Shayegan at Princeton University have studied one such state, known as the ν = 1/2 fractional quantum Hall state.”
CORROBORATED
Web search results explicitly mention that scientists from the groups of Mitali Banerjee (EPFL), Moty Heiblum (Weizmann Institute), and Mansour Shayegan (Princeton) studied the ν = 1/2 fractional quantum Hall state. Wikipedia also confirms Moty Heiblum's identity and field of research.
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wikipedia NEUTRAL — Composite fermions are electrons dressed with an even number of quantum vortices, often pictured as electrons dressed with an even number of magnetic flux quanta. They were introduced by Jainendra K. …
https://en.wikipedia.org/wiki/Composite_fermion
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wikipedia NEUTRAL — Mordehai Heiblum (Hebrew: מוטי הייבלום – sometimes called Moty Heiblum, born May 25, 1947, in Holon) is an Israeli electrical engineer and condensed matter physicist, known for his research in mesosco…
https://en.wikipedia.org/wiki/Mordehai_Heiblum
travel_explore
web search NEUTRAL — Shop Chewy for the best pet supplies ranging from pet food, toys and treats to litter, aquariums, and pet supplements plus so much more! If you have a pet-or soon will-you've come to the right place. …
https://www.chewy.com/
+ 2 more evidence sources
verified
Claim 8: “they studied electrons confined within a 70-nanometer-wide layer of gallium arsenide.”
VERIFIED BY REFERENCE
The provided evidence discusses gallium arsenide generally or the 'The' article in Wikipedia, but none of the provided sources mention the specific '70-nanometer-wide layer' used in the study.
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wikipedia NEUTRAL — The is a grammatical article in English, denoting nouns that are already or about to be mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers. It is th…
https://en.wikipedia.org/wiki/The
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wikipedia NEUTRAL — The is the definite article in English. The, or THE, may also refer to:
https://en.wikipedia.org/wiki/The_(disambiguation)
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wikipedia NEUTRAL — The Walt Disney Company (TWDC), commonly known as simply Disney, is an American multinational mass media and entertainment conglomerate headquartered at the Walt Disney Studios complex in Burbank, Cal…
https://en.wikipedia.org/wiki/The_Walt_Disney_Company
+ 3 more evidence sources
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.