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Related Concept Videos

The Hall Effect01:30

The Hall Effect

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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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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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Phase Diagram01:19

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5.8K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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Non-centrosymmetric topological phase probed by non-linear Hall effect.

Naizhou Wang1, Jing-Yang You2, Aifeng Wang3

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Researchers discovered a new non-centrosymmetric topological phase in ZrTe5 using the non-linear Hall effect. This finding offers a new way to study and control quantum geometry in materials by examining crystal symmetries.

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ZrTe5non-linear Hall effecttopological insulator

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Geometry

Background:

  • Non-centrosymmetric topological materials exhibit unique properties compared to centrosymmetric ones.
  • Probing local quantum geometry in these materials presents significant challenges.
  • The non-linear Hall (NLH) effect is a promising tool for investigating local quantum geometry.

Purpose of the Study:

  • To report a novel non-centrosymmetric topological phase in ZrTe5.
  • To utilize the NLH effect to probe local quantum geometry in this material.
  • To investigate the role of crystal symmetries in this phase.

Main Methods:

  • Angle-resolved and temperature-dependent non-linear Hall (NLH) effect measurements.
  • Theoretical calculations to support experimental findings.
  • Analysis of symmetry breaking in ZrTe5.

Main Results:

  • Identification of a non-centrosymmetric topological phase in ZrTe5.
  • Experimental evidence of inversion and ab-plane mirror symmetries breaking below 30 K.
  • Confirmation of results through theoretical calculations.

Conclusions:

  • ZrTe5 hosts a new non-centrosymmetric topological phase.
  • The NLH effect effectively probes local quantum geometry in this material.
  • This work provides a platform for controlling quantum geometry via crystal symmetries.