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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Related Experiment Video

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Determining Membrane Protein Topology Using Fluorescence Protease Protection FPP
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Topological Amorphous Metals.

Yan-Bin Yang1, Tao Qin2, Dong-Ling Deng1

  • 1Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, People's Republic of China.

Physical Review Letters
|September 7, 2019
PubMed
Summary
This summary is machine-generated.

Researchers discovered a novel topological amorphous metal phase in disordered systems. This exotic phase breaks traditional symmetry rules, offering new avenues for exploring topological phenomena in amorphous materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Topological Matter

Background:

  • Amorphous systems lack long-range order, posing challenges for traditional topological characterization.
  • Topological phases are typically studied in crystalline solids with preserved translational symmetry.

Purpose of the Study:

  • To investigate the possibility of exotic topological phases in amorphous systems.
  • To characterize a novel topological amorphous metal phase in three dimensions.

Main Methods:

  • Construction and exploration of a model Hamiltonian for amorphous systems.
  • Analysis of energy band and quantum transport properties.
  • Investigation of topological invariants beyond the first Chern number, such as the Bott index.

Main Results:

  • Identification of a topological amorphous metal phase in three-dimensional disordered systems.
  • Demonstration that this phase breaks translational symmetry, differing from Weyl semimetals.
  • Observation of topological properties manifested in the Bott index, Hall conductivity, and surface states.
  • Characterization of diffusive metal behavior in topological amorphous metals.

Conclusions:

  • Topological amorphous metals represent an exotic phase of matter in disordered systems.
  • Their topological properties require characterization using invariants like the Bott index.
  • Experimental realization is proposed using electric circuits, paving the way for exploring topological gapless phenomena in amorphous materials.