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Scientists have successfully measured fractional charges (e/3) in graphene using an "antidot" device that simplifies conductance detection of quasiparticles. This breakthrough provides a cleaner experimental pathway for studying exotic quantum states and could extend to other van der Waals materials, advancing our understanding of topological phases without relying on complex measurement techniques.

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Scientists detect e/3 charge in graphene’s quantum Hall state

Quantum ZeitgeistAugust 15, 20266 min read

Scientists detected a charge of e/3 in graphene’s fractional quantum Hall effect, using “antidots” to measure quasiparticle charges via conductance.

Researchers at the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland, collaborating with scientists from the National Institute for Materials Science in Japan and the Rudolf Peierls Centre for Theoretical Physics, Parks Road, Oxford, UK, have directly measured a charge of e/3 in graphene using a novel antidot within a graphene sheet that isolates the fractional quantum Hall effect, allowing for straightforward conductance measurements of quasiparticle tunneling. The work reports fractional charges of q = e/3 at filling factors of 4/3, 5/3, and 7/3, alongside q = 2e/3 at 2/3 and q = 3e/5 at 3/5, while at ν = 8/3 they observe signatures of both e/3 and 2e/3 tunneling charge,…

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