تقرير
The unconventional two-parameter quantum valley pumping in graphene with a topological line defect
| العنوان: | The unconventional two-parameter quantum valley pumping in graphene with a topological line defect |
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| المؤلفون: | Ren, C D, Cui, L, Lu, W T, Tian, H Y, Wang, S K |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Quantum Gases |
| الوصف: | Based on the Keldysh Green's function method, we report an unconventional two-parameter quantum pumping in graphene with a line defect. It is found that different from the conventional sinusoidal relation, the pumped current in this device is cosinusoid dependence on the phase difference between the two pumping potentials, which adopts its positive/nagative maximum value at while tends to zero at . This phenomenon is related to the peculiar valley tunneling characteristics across the line defects and the exchange of valley indices on both sides of the line defect. Moreover, the pumped currents from the two valleys will flow in opposite directions along the line defect, indicating that the controllable valley current can be pumped out in the line defect without the application of strain field in graphene. Comment: 10 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2111.11686 |
| رقم الأكسشن: | edsarx.2111.11686 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |