Engineering Point-Defect States in Monolayer WSe₂

Chendong Zhang; Cong Wang; Feng Yang; Jing-Kai Huang; Lain-Jong Li; Wang Yao; Wei Ji; Chih-Kang Shih

doi:10.1021/acsnano.8b07595

journal article·2019-02-11

Engineering Point-Defect States in Monolayer WSe₂

Chendong Zhang, Cong Wang, Feng Yang, Jing-Kai Huang, Lain-Jong Li, Wang Yao, Wei Ji, Chih-Kang Shih

ACS Nano

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Source abstract

Abstract

Defect engineering is a key approach for tailoring the properties of the emerging two-dimensional semiconductors. Here, we report an atomic engineering of the W vacancy in monolayer WSe2 by single potassium atom decoration. The K decoration alters the energy states and reshapes the wave function such that previously hidden midgap states become visible with well-resolved multiplets in scanning tunneling spectroscopy. Their energy levels are in good agreement with first-principle calculations. More interestingly, the calculations show that an unpaired electron donated by the K atom can lead to a local magnetic moment, exhibiting an on–off switching by the odd–even number of electron filling. Experimentally the Fermi level is pinned above all defect states due to the graphite substrate, corresponding to an off state. The close agreement between theory and experiment in the off state, on the other hand, suggests the possibility of gate-programmable magnetic moments at the defects.

Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics and Technology, Wuhan University, Wuhan 430072, China

Department of Physics, University of Texas at Austin, Austin, Texas 78712, United States

Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-Nano Devices, Renmin University of China, Beijing 100872, China

Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia

Department of Physics and Center of Theoretical and Computational Physics, University of Hong Kong, Hong Kong, China

Funding

Welch Foundation · Research Grants Council, University Grants Committee · Ministry of Science and Technology of the People's Republic of China · Ministry of Education of the People's Republic of China · Renmin University of China · Division of Emerging Frontiers in Research and Innovation · Air Force Office of Scientific Research · King Abdullah University of Science and Technology · Croucher Foundation · National Natural Science Foundation of China · Division of Materials Research · Chinese Academy of Sciences

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