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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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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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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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1.0K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

934
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Spin-orbit-splitting-driven nonlinear Hall effect in NbIrTe4.

Ji-Eun Lee1,2,3,4, Aifeng Wang5,6, Shuzhang Chen5,7

  • 1Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.

Nature Communications
|May 10, 2024
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Summary
This summary is machine-generated.

Researchers discovered a room-temperature nonlinear Hall effect in NbIrTe4, driven by Berry curvature dipole tuned by temperature-dependent electronic band structure. This finding offers new routes for engineering exotic Hall effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • The nonlinear Hall effect (NLHE) is crucial for advanced electronic technologies.
  • Berry curvature dipole (BCD) is a key factor in NLHE, but its relationship with electronic band structure is not well understood.
  • Systematic studies are needed to clarify the interplay between BCD and NLHE.

Purpose of the Study:

  • To investigate the NLHE in NbIrTe4.
  • To understand the role of BCD and electronic band structure in temperature-dependent NLHE.
  • To explore potential for engineering non-trivial Hall effects.

Main Methods:

  • First-principles calculations.
  • Angle-resolved photoemission spectroscopy (ARPES) measurements.
  • Analysis of electronic band structure and Berry curvature dipole.

Main Results:

  • Observed NLHE in NbIrTe4 persisting above room temperature.
  • Demonstrated a sign change in Hall conductivity at 150 K.
  • Identified temperature-tuned BCD, arising from partial occupancy of spin-orbit split bands, as the cause of temperature-dependent NLHE.

Conclusions:

  • Established a direct correlation between BCD and electronic band structure in NbIrTe4.
  • Showcased temperature as a tuning parameter for BCD and NLHE.
  • Provided a pathway for designing and manipulating non-trivial Hall effects in transition-metal chalcogenides.