Exploration of physics of two-dimensional superstructures

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02566
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Nagoya University
• Principal Investigator: Kitaura Ryo 名古屋大学, 理学研究科, 特任准教授 (50394903)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 二次元半導体 / 結晶成長 / 光物性

Outline of Final Research Achievements

This study has discovered a new method for growing two-dimensional semiconductor crystals with nanoscale junction structures, which was previously assumed to be impossible. The technique used was organic metalorganic chemical vapor deposition (MOCVD), where high vapor pressure Mo and W precursors were supplied to the growth chamber sequentially. This resulted in the creation of junction widths ranging from sub-nanometers to a few nanometers on hexagonal boron nitride substrates. The same approach was successful in creating stacked structures with junction interfaces. Through first-principles calculations and spectroscopic measurements, the electronic states and optical properties of these new nanostructures were thoroughly examined and verified.

Free Research Field

ナノサイエンス

Academic Significance and Societal Importance of the Research Achievements

本研究の意義は、新たなナノ構造作製手法を開発したことにある。これによって、従来法では実現できなかったナノスケール二次元ヘテロ構造をデザインして実現可能となり、これによって構造のデザインに基づいてさまざまな機能・物性を引き出すことが可能となる。とくに、二次元構造中にナノスケールの局所構造を作り込むことが可能となることから、量子光源や量子ビットといった量子技術への展開も視野に入る。