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Related Concept Videos

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.0K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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2.0K
Bonding in Metals02:32

Bonding in Metals

46.1K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Flat Bands and Temperature-Driven Phase Transition in Quasi-One-Dimensional Zigzag Chains.

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Researchers discovered flat bands in a 1D zigzag lattice, a breakthrough for one-dimensional systems. This finding opens new avenues for exploring strongly correlated electron behaviors and topological properties in reduced dimensions.

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Flat bands in two-dimensional (2D) materials are known for strong correlation effects.
  • The existence of flat bands in one-dimensional (1D) systems has been challenging to achieve.
  • 1D systems are crucial for fundamental physics and potential technological applications.

Purpose of the Study:

  • To propose and experimentally realize a 1D system hosting flat bands.
  • To investigate the electronic properties and phase transitions in this novel 1D material.
  • To explore the potential for studying strongly correlated electron behaviors and topological properties in 1D.

Main Methods:

  • Theoretical proposal of a 1D zigzag lattice.
  • Experimental realization using CuTe chains on Cu(111).
  • Confirmation via tight-binding model, first-principles calculations, and angle-resolved photoemission spectroscopy (ARPES).

Main Results:

  • Successful identification of flat bands in the 1D zigzag lattice.
  • Discovery of a temperature-driven phase transition around 250 K.
  • Observation of Tomonaga-Luttinger liquid behavior with spin-charge separation.

Conclusions:

  • The 1D zigzag lattice serves as a viable platform for hosting flat bands.
  • This system exhibits unique electronic properties and phase transitions relevant to condensed matter physics.
  • The findings pave the way for exploring 1D strongly correlated and topological phenomena.