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Odd-parity currents induced by dynamic deformations in graphene-like systems.
Kai Zhang1, Erhu Zhang, Huawei Chen
1School of Science, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China. School of Science, Xi'an Technological University, Xi'an 710021, People's Republic of China.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 13, 2016
Summary
This study explores current responses in graphene-like systems using reduced dimensional Dirac systems. Inter-valley scattering can create tunable, valley-polarized electric currents and topological currents via dynamic deformations.
Area of Science:
- Condensed matter physics
- Materials science
- Quantum mechanics
Background:
- Graphene and similar 2D materials exhibit unique electronic properties.
- Understanding current responses to external fields is crucial for electronic device applications.
- Topological properties in electronic systems offer novel functionalities.
Purpose of the Study:
- Investigate current responses in reduced (3+1)-dimensional Dirac systems.
- Analyze the impact of inter-pseudo-spin and inter-valley scattering on current generation.
- Explore the realization of valley-polarized and topological electric currents.
Main Methods:
- Utilized reduced (3+1)-dimensional Dirac systems.
- Derived current responses from (chiral) current-(chiral) current correlation functions.
- Employed dynamic deformations to generate chiral gauge fields.
Main Results:
- Inter-valley scattering can disrupt the topological nature of odd-parity currents.
- Achieved valley-polarized electric currents under specific conditions.
- Generated tunable vortex-like currents through dynamic deformations.
- Identified a linear dynamic deformation as a facile method for topological electric current realization.
Conclusions:
- Inter-valley scattering plays a key role in modulating topological properties and enabling valley polarization.
- Dynamic deformations offer a controllable pathway to generate exotic current profiles, including vortex-like and topological currents.
- The findings provide a more manageable approach to realizing topological electric currents in graphene-like systems.
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