Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer graphene
We investigate the electrical transport properties of the minivalley polarized state proposed recently in slightly doped Bernal bilayer graphene (BLG) in large electric displacement fields. By minimizing the Hartree-Fock (HF) energy functional, we first confirm the appearance of minivalley polarized...
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American Physical Society
2025-01-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.7.013109 |
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| author | Yuelin Shao Xi Dai |
| author_facet | Yuelin Shao Xi Dai |
| author_sort | Yuelin Shao |
| collection | DOAJ |
| description | We investigate the electrical transport properties of the minivalley polarized state proposed recently in slightly doped Bernal bilayer graphene (BLG) in large electric displacement fields. By minimizing the Hartree-Fock (HF) energy functional, we first confirm the appearance of minivalley polarized phase. At the low carrier doping regime, the one-pocket state will be stabilized where only one of the trigonal-wrapping-induced Fermi pockets near the atomic-valley center is filled. Then we study the electrical transport of the one-pocket state by solving the Boltzmann equation. We find that the valley polarization could be easily flopped by an in-plane electrical field, which will lead to hysteresis loop in the direct current (DC) I-V curves. Such irreversible current responses in the DC limit will directly induce strong nonlinear and nonreciprocal alternating current (AC) responses, which has been already observed in the recent experiments on BLG. |
| format | Article |
| id | doaj-art-e08a941eb2554518a8f3004891f2769c |
| institution | Kabale University |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-e08a941eb2554518a8f3004891f2769c2025-01-29T15:01:45ZengAmerican Physical SocietyPhysical Review Research2643-15642025-01-017101310910.1103/PhysRevResearch.7.013109Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer grapheneYuelin ShaoXi DaiWe investigate the electrical transport properties of the minivalley polarized state proposed recently in slightly doped Bernal bilayer graphene (BLG) in large electric displacement fields. By minimizing the Hartree-Fock (HF) energy functional, we first confirm the appearance of minivalley polarized phase. At the low carrier doping regime, the one-pocket state will be stabilized where only one of the trigonal-wrapping-induced Fermi pockets near the atomic-valley center is filled. Then we study the electrical transport of the one-pocket state by solving the Boltzmann equation. We find that the valley polarization could be easily flopped by an in-plane electrical field, which will lead to hysteresis loop in the direct current (DC) I-V curves. Such irreversible current responses in the DC limit will directly induce strong nonlinear and nonreciprocal alternating current (AC) responses, which has been already observed in the recent experiments on BLG.http://doi.org/10.1103/PhysRevResearch.7.013109 |
| spellingShingle | Yuelin Shao Xi Dai Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer graphene Physical Review Research |
| title | Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer graphene |
| title_full | Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer graphene |
| title_fullStr | Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer graphene |
| title_full_unstemmed | Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer graphene |
| title_short | Giant high-order nonlinear and nonreciprocal electrical transports induced by valley flipping in Bernal bilayer graphene |
| title_sort | giant high order nonlinear and nonreciprocal electrical transports induced by valley flipping in bernal bilayer graphene |
| url | http://doi.org/10.1103/PhysRevResearch.7.013109 |
| work_keys_str_mv | AT yuelinshao gianthighordernonlinearandnonreciprocalelectricaltransportsinducedbyvalleyflippinginbernalbilayergraphene AT xidai gianthighordernonlinearandnonreciprocalelectricaltransportsinducedbyvalleyflippinginbernalbilayergraphene |