Der «Wunderstoff» Graphen – eine zweidimensionale, nur eine Atomlage dünne Bienenwabenstruktur aus Kohlenstoffatomen – hat zahlreiche herausragende Eigenschaften. Dazu gehören etwa enorme mechanische Widerstandsfähigkeit und ausserordentliche elektronische und optische Eigenschaften. Dass er sogar magnetisch sein kann, konnte ein Team
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