鉄基超伝導体におけるマジョラナ結合状態の証拠
Dongfei Wang1,2, Lingyuan Kong1,2, Peng Fan1,2
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China.
まとめ
研究者らは,超伝導体内のマジョラーナ結合状態 (MBS) を発見し,量子コンピューティングの重要なステップとなりました. これらの状態は渦中核で観察され 高温で強力な量子情報処理を可能にします
科学分野:
- 凝縮物質物理学
- 量子材料について
- 超伝導性
背景:
- マジョラーナ・バインド状態 (MBS) は,非アベルの統計により,故障耐性量子計算における可能性のために求められる.
- 二次元のトポロジカルな超伝導体は,渦の中でのゼロエネルギーモードとしてMBSをホストすると予測されています.
研究 の 目的:
- FeTe0.55Se0.45の超伝導ディラク表面状態におけるMBSの存在と性質を実験的に調査する.
- 比較的高い温度でMBSを実現し,操作するための潜在的なプラットフォームを探求する.
主な方法:
- FeTe0.55Se0.45の超伝導ディラック表面状態を検出するためにスキャニングトンネルスペクトロスコーピー (STS) を利用した.
- 異なる磁場,温度,トンネリングバリア条件下で渦の中核で観測されたゼロバイアスのピークを分析した.
主要な成果:
- 渦の中心から離れるときに 分裂しない 安定したピークを観測した
- 異なる実験条件下でのピークの行動は,非トポロジカルな状態とは異なる,ほぼ純粋なMBSへのトンネリングを強く示唆しています.
結論:
- 実験的証拠は,鉄ベースの超伝導体FeTe0.55Se0.45におけるMBSの識別を支持する.
- この材料は,アクセス可能な温度でMBSの実現と操作のための有望なプラットフォームを提供し,量子コンピューティングの研究を進めています.
関連する概念動画
Superconductor
1.8K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.8K
The Evidence for Evolution
48.3K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
48.3K
Types Of Superconductors
1.6K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.6K
Ions as Acids and Bases
26.6K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.6K
Lewis Acids and Bases
48.4K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
48.4K
Weak Base Solutions
25.3K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
25.3K


