Статья

Observing Atomic Collapse Resonances in Artificial Nuclei on Graphene

Yang WangDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USADillon WongDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USAA. V. ShytovSchool of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UKVictor W. BrarDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USASangkook ChoiDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USAQiong WuDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USAHsin‐Zon TsaiDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USAWilliam ReganDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USAAlex ZettlDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USARoland KawakamiDepartment of Physics and Astronomy, University of California at Riverside, Riverside, CA 92521, USASteven G. LouieDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USALeonid LevitovDepartment of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USAMichael F. CrommieDepartment of Physics, University of California at Berkeley, Berkeley, CA 94720, USA

2013en

ABI

Аннотация

Relativistic quantum mechanics predicts that when the charge of a superheavy atomic nucleus surpasses a certain threshold, the resulting strong Coulomb field causes an unusual atomic collapse state; this state exhibits an electron wave function component that falls toward the nucleus, as well as a positron component that escapes to infinity. In graphene, where charge carriers behave as massless relativistic particles, it has been predicted that highly charged impurities should exhibit resonances corresponding to these atomic collapse states. We have observed the formation of such resonances around artificial nuclei (clusters of charged calcium dimers) fabricated on gated graphene devices via atomic manipulation with a scanning tunneling microscope. The energy and spatial dependence of the atomic collapse state measured with scanning tunneling microscopy revealed unexpected behavior when occupied by electrons.

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Идентификаторы

DOI: 10.1126/science.1234320

Цитирования и источники

Цитирований: 6Использованных источников: 0

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