Work

Atomic collapse of high-order singular potentials in graphene

Year: 2025

Type: article

Abstract: Artificial atoms in graphene hosting a series of quasi-bound states can serve as an excellent platform to explore atomic collapse and become a basis to design novel graphene nanodevices. We theoretically study behaviors of massless Dirac fermions in singular potentials with a general form of 1/r^γ. Different from the Coulomb potential that demands a supercritical charge Z > Zc, a high-order singular potential (γ > 1) is found to in principle induce atomic collapse with an infinitesimal charge Z. The energies of atomic collapse states (ACSs) within these potentials are arranged roughly as a power sequence. We also show that some special ACSs can exist even above the bulk Dirac point, which cannot appear in the Coulomb potential. These findings uncover the anomalies of massless Dirac fermions in diverse charge potentials and provide guidance for further experiments and graphene nanodevice applications.

Source: Physical review. B./Physical review. B

DOI: 10.1103/kxy7-ntsm

Authors: Yu-Chen Zhuang, Yue Mao, Qing-Feng Sun

Institution: Peking University

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China

Awards: G2218941694, G3955724869, G7883239182, G8589059293