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Graphene is a two-dimensional system composed of carbon atoms arranged in a single-layer hexagonal honeycomb lattice. Its band structure exhibits unique linear dispersion at low energies, with quasiparticles behaving like relativistic particles. This gives rise to numerous novel phenomena in graphene, such as Klein tunneling, Hall plateaus at half-integer quantized values, and specular Andreev reflection. Since the successful experimental fabrication of graphene in the early 21st century, it has attracted tremendous interest and sparked extensive follow-up research.

In this talk, I will briefly introduce graphene and present our recent research progress in this field. We will focus specifically on the regulation and evolution of valley states, collapsed states, and whispering-gallery modes in confined graphene systems. For example: (1) In bilayer graphene quantum dots, continuous tuning of the Berry phase and valley degree of freedom is achieved by applying a magnetic field; (2) In monolayer graphene, confined valley state regulation is realized through the combined effect of strain-induced pseudomagnetic fields and real magnetic fields; (3) In graphene quantum dots, we discovered the coexistence, mutual evolution, and hybridization of atomic collapsed states and whispering-gallery modes.

Sun Qingfeng is a Professor at the School of Physics, Peking University. He obtained his Bachelor of Science (1995) and Doctor of Philosophy (2000) degrees from Peking University. He conducted postdoctoral research at McGill University (Canada) from 2000 to 2003, and worked at the Institute of Physics, Chinese Academy of Sciences (CAS) from 2003 to 2013. Since 2013, he has been affiliated with Peking University. His research focuses on condensed matter theory, with a specialization in quantum transport in low-dimensional systems, including quantum dots, graphene, strongly correlated many-body systems and the Kondo effect, topological systems, Majorana fermions, and organic molecular systems. He has published over 300 SCI-indexed papers, including 24 in Physical Review Letters and more than 190 in Physical Review B, with an H-index of 48.

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