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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Metallic Solids

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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.
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Twisted Bilayer Materials as a Promising Platform for Solid-State Qubits.

Zhigang Song1, Yidan Wang2, Péter Udvarhelyi3

  • 1Harvard University, John A. Paulson School of Engineering and Applied Sciences, Cambridge, Massachusetts 02138, USA.

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This summary is machine-generated.

Twisted bilayer materials offer a novel platform for qubits, overcoming challenges in scalability and identical preparation found in current quantum technologies. These materials provide uniform, localized states suitable for quantum computing, communication, and sensing applications.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Qubits are essential for quantum computing, communication, and sensing.
  • Current qubit platforms face challenges in scalability and identical preparation.
  • Developing stable, scalable, and uniform qubits is a significant hurdle.

Purpose of the Study:

  • To introduce twisted bilayer materials as a promising platform for scalable and uniform qubits.
  • To investigate the potential of moiré superlattices in twisted bilayer materials for qubit applications.
  • To explore the advantages of these novel qubits over existing solid-state systems.

Main Methods:

  • Large-scale first-principles calculations were performed.
  • Analysis focused on the electronic states within moiré superlattices.
  • Consideration of existing experimental techniques for qubit manipulation.

Main Results:

  • Moiré superlattices in twisted bilayer materials exhibit identical and localized electronic states.
  • These states are analogous to the discrete energy levels of alkali atoms.
  • The proposed qubits demonstrate inherent scalability and uniformity.

Conclusions:

  • Twisted bilayer materials present a viable and advantageous platform for next-generation qubits.
  • The tunability and natural patterns of these materials facilitate qubit development.
  • This approach offers significant improvements over conventional solid-state qubit systems for quantum technologies.