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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
Summary
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.
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.
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