Journal
SCIENCE
Volume 357, Issue 6347, Pages 181-184Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aal3357
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Funding
- European Research Council
- Lloyd's Register Foundation
- Graphene Flagship
- Royal Society
- Engineering and Physical Sciences Research Council
- Marie Curie program SPINOGRAPH
- Russian Science Foundation
- National University of Science and Technology (MISiS)
- EPSRC [EP/N010345/1, EP/K005014/1] Funding Source: UKRI
- Russian Science Foundation [17-12-01393] Funding Source: Russian Science Foundation
- Engineering and Physical Sciences Research Council [EP/N010345/1] Funding Source: researchfish
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Cyclotron motion of charge carriers in metals and semiconductors leads to Landau quantization and magneto-oscillatory behavior in their properties. Cryogenic temperatures are usually required to observe these oscillations. We show that graphene superlattices support a different type of quantum oscillation that does not rely on Landau quantization. The oscillations are extremely robust and persist well above room temperature in magnetic fields of only a few tesla. We attribute this phenomenon to repetitive changes in the electronic structure of superlattices such that charge carriers experience effectively no magnetic field at simple fractions of the flux quantum per superlattice unit cell. Our work hints at unexplored physics in Hofstadter butterfly systems at high temperatures.
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