General Theory for Longitudinal Nonreciprocal Charge Transport

Area of Science:

• Condensed Matter Physics
• Materials Science
• Solid-State Physics

Background:

• Longitudinal nonreciprocal charge transport (NCT) is crucial for advanced two-terminal rectification devices.
• Existing materials exhibiting NCT often require high magnetic fields or specific temperatures, limiting practical applications.
• A theoretical framework for discovering room-temperature NCT materials is currently lacking.

Purpose of the Study:

• To develop a theory for longitudinal nonreciprocal charge transport (NCT) in crystalline materials.
• To guide the discovery of new materials exhibiting NCT at room temperature and low magnetic fields.
• To identify mechanisms and material candidates for next-generation rectification devices.

Main Methods:

• Semiclassical Boltzmann transport theory was employed.
• Symmetry analysis was used to classify magnetic point groups concerning NCT.
• Symmetry-adapted Hamiltonian analysis identified novel NCT mechanisms.

Main Results:

• A comprehensive theory for longitudinal NCT in crystalline materials was established.
• The 122 magnetic point groups were classified based on their NCT potential.
• A previously unrecognized mechanism driving NCT was uncovered.
• First-principles prediction of room-temperature NCT in multiferroic ϵ-Fe_{2}O_{3} without external magnetic fields.

Conclusions:

• The developed theory provides a pathway for discovering materials with intrinsic longitudinal NCT.
• The findings advance fundamental understanding of charge transport in magnetic materials.
• This research aids in the design of novel semiconductor diodes and rectification devices.