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Nonreciprocal responses from non-centrosymmetric quantum materials.
Yoshinori Tokura1,2, Naoto Nagaosa3,4
1RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan. tokura@riken.jp.
Nature Communications
|September 16, 2018
Summary
Quantum materials with broken inversion symmetry exhibit directional transport. Breaking time-reversal symmetry further enhances these nonreciprocal responses, crucial for functional topological materials.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Directional transport of quantum particles (electrons, photons, spins, phonons) occurs in materials lacking inversion symmetry.
- Nonreciprocal responses are amplified in noncentrosymmetric quantum materials by breaking time-reversal symmetry (magnetic field, magnetization).
Purpose of the Study:
- To review mechanisms, phenomena, and functions of nonreciprocal responses in noncentrosymmetric quantum materials.
- To highlight the role of quantum Berry phase, toroidal moment, and magnetoelectric monopole.
Main Methods:
- Review of existing literature on nonreciprocal phenomena in quantum materials.
- Analysis of mechanisms including broken inversion and time-reversal symmetries.
- Exploration of nonlinear regime responses.
Main Results:
- Nonreciprocal transport is observed in various quantum particles and currents.
- Magnetochiral effects and nonreciprocal spin transport emerge with broken time-reversal symmetry.
- Nonlinear phenomena like photocurrent and magnetoresistance are discussed.
Conclusions:
- Nonreciprocal responses are fundamental to noncentrosymmetric quantum materials.
- These effects are linked to topological properties and offer pathways for novel device functionalities.
- Understanding these mechanisms is key for developing advanced functional topological materials.
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