二次元鉱物[Pb2BiS3][AuTe2]:単原子厚層の高移動性電荷载体である
Lei Fang1, Jino Im, Constantinos C Stoumpos
1†Department of Chemistry, ‡Department of Physics and Astronomy, and §Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|January 23, 2015
まとめ
自然に存在するブックホーナイト[Pb2BiS3][AuTe2]は,2次元 (2D) キャリアを単原子厚の層で宿している. この新しい2Dセミメタルは,高いキャリアモビリティとグラフェンに似た電子特性を示しています.
科学分野:
- 凝縮物質物理学 凝縮物質物理学
- マテリアルサイエンス 材料科学
- 固体化学 固体化学
背景:
- 二次元 (2D) 電子システムは,ユニークな物理現象と技術的可能性を備えています.
- 新しい2D素材の発見は,電子アプリケーションの進歩に不可欠です.
研究 の 目的:
- 自然に存在する鉱物ブックホーナイト[Pb2BiS3][AuTe2]の電子特性を調査する.
- 新しい2D電子現象のためのプラットフォームとしての潜在能力を探求する.
主な方法:
- [Pb2BiS3][AuTe2]サンプルを合成する.
- マグネトトランスポート測定.
- 理論的な電子構造の計算.
主要な成果:
- [Pb2BiS3][AuTe2]は,単原子厚の[AuTe2]層に限定された2Dキャリアを宿している.
- それは,補償された電子穴密度と高い穴の移動性 (∼1360 cm(2) / ((V s)) を有する多帯域半金属です.
- この材料は極度のアニソトロピー (∼10^4) とグラフェンのような電子特性 (線形分散,超高フェルミ速度) を表しています.
結論:
- バックホーナイト[Pb2BiS3][AuTe2]は,ユニークな電子特性を持つ有望な新しい2D素材です.
- その構造は,2Dシステムにおける新興電子行動の調査を容易にする.
- 弱い層間結合により,デバイス製造の際に簡単に割れることができます.
関連する概念動画
Metallic Solids
21.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
21.6K
Valence Bond Theory
11.9K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.9K
Ionic Crystal Structures
21.7K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
21.7K
The Electrical Double Layer
207
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
207
Hybridization of Atomic Orbitals I
69.7K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
69.7K
Crystal Field Theory - Tetrahedral and Square Planar Complexes
50.1K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
50.1K


