Anomalous Hall Effect in the Dirac Semimetal Cd_{3}As_{2} Probed by In-Plane Magnetic Field.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Transport Phenomena

Background:

• The anomalous Hall effect (AHE) is a transport phenomenon linked to Bloch wave function geometry, observable in both magnetic and nonmagnetic systems.
• Detecting field-induced AHE in nonmagnetic materials is challenging due to small band modulations from Zeeman and spin-orbit couplings compared to Lorentz forces.
• Time-reversal symmetry breaking via external fields is necessary for AHE in nonmagnetic systems.

Purpose of the Study:

• To quantitatively probe field-induced AHE in nonmagnetic Dirac semimetal Cd_{3}As_{2} films.
• To investigate the emergence of AHE with in-plane magnetic field rotation.
• To explore the role of electron density in modulating AHE.

Main Methods:

• Utilized Dirac semimetal Cd_{3}As_{2} thin films.
• Applied and rotated magnetic fields within the Hall deflection plane.
• Measured AHE on Cd_{3}As_{2} (112) planes, focusing on ultralow-electron-density films.

Main Results:

• Demonstrated quantitative probing of field-induced AHE in nonmagnetic Cd_{3}As_{2} films.
• Observed a distinct threefold symmetric AHE component upon in-plane magnetic field rotation.
• Found that the intrinsic AHE response is enhanced in ultralow-electron-density films.

Conclusions:

• Field-induced AHE in nonmagnetic systems can be effectively measured using in-plane field rotation.
• The study highlights the significance of geometric properties of Bloch wave functions in nonmagnetic AHE.
• Findings open avenues for researching Hall responses as orbital magnetization in nonmagnetic materials.