Superconducting pump manipulated by non-topologically quasi and topological interface states
We propose an adiabatic superconducting charge pump based on massive Dirac electrons. A superconductor is sandwiched in between two pumping sources, which are formed by introducing the time-dependent and out-of-phase staggered potentials in graphene as pumping parameters. The pump is shown to be cha...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ad149b |
| _version_ | 1827576119730110464 |
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| author | Zixuan Ding Sake Wang Mengyao Li Yongchun Tao Jun Wang |
| author_facet | Zixuan Ding Sake Wang Mengyao Li Yongchun Tao Jun Wang |
| author_sort | Zixuan Ding |
| collection | DOAJ |
| description | We propose an adiabatic superconducting charge pump based on massive Dirac electrons. A superconductor is sandwiched in between two pumping sources, which are formed by introducing the time-dependent and out-of-phase staggered potentials in graphene as pumping parameters. The pump is shown to be characterized by not only the topological interface state (TIS) but also the non-topologically quasi interface state (QIS). Hereafter, our attention is focused on the pumping currents $ I_{L}^{\textrm{NR}} $ and $ I_{L}^{\textrm{AR}} $ from the normal and Andreev reflections, respectively, which predominate by making the electron energy reside in the effective energy gap. It is found that modulating the energy E , superconductor length L _0 , and pumping source length $ L_\textrm{P} $ results in the considerable variation of competitive behaviors between $ I_{L}^{\textrm{NR}} $ and $ I_{L}^{\textrm{AR}} $ . In particular, the reversal effect of current direction can be realized by tuning $ L_\textrm{P} $ . More interestingly, the current-phase relationship exhibits the platform behaviors, which can be manipulated by $ L_\textrm{P} $ and the pumping strength. All the above pumping properties are attributed to the adiabatic evolution of TIS and non-topologically QIS, particularly the conversion between each other is the crucial origin. We also obtain the quantized pumping current by adjusting $ L_\textrm{P}$ and L _0 , and present the corresponding qualitative explanation through the pumping contour circled by the two parameters. In addition, we discuss the features of pumping current based on the armchair graphene as well. |
| first_indexed | 2024-03-08T21:06:33Z |
| format | Article |
| id | doaj.art-869063dd5f4f463bb30651bcb0c966b6 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-08T21:06:33Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-869063dd5f4f463bb30651bcb0c966b62023-12-22T11:58:55ZengIOP PublishingNew Journal of Physics1367-26302023-01-01251212303910.1088/1367-2630/ad149bSuperconducting pump manipulated by non-topologically quasi and topological interface statesZixuan Ding0Sake Wang1https://orcid.org/0000-0002-1004-4109Mengyao Li2https://orcid.org/0000-0001-6351-3098Yongchun Tao3https://orcid.org/0000-0001-5539-3815Jun Wang4https://orcid.org/0000-0002-6278-0677Department of Physics, Nanjing Normal University , Nanjing 210023, People’s Republic of ChinaCollege of Science, Jinling Institute of Technology , Nanjing 211169, Jiangsu, People’s Republic of ChinaCollege of Science, Nanjing Forestry University , Nanjing 210037, Jiangsu, People’s Republic of ChinaDepartment of Physics, Nanjing Normal University , Nanjing 210023, People’s Republic of ChinaDepartment of Physics, Southeast University , Nanjing 210096, People’s Republic of ChinaWe propose an adiabatic superconducting charge pump based on massive Dirac electrons. A superconductor is sandwiched in between two pumping sources, which are formed by introducing the time-dependent and out-of-phase staggered potentials in graphene as pumping parameters. The pump is shown to be characterized by not only the topological interface state (TIS) but also the non-topologically quasi interface state (QIS). Hereafter, our attention is focused on the pumping currents $ I_{L}^{\textrm{NR}} $ and $ I_{L}^{\textrm{AR}} $ from the normal and Andreev reflections, respectively, which predominate by making the electron energy reside in the effective energy gap. It is found that modulating the energy E , superconductor length L _0 , and pumping source length $ L_\textrm{P} $ results in the considerable variation of competitive behaviors between $ I_{L}^{\textrm{NR}} $ and $ I_{L}^{\textrm{AR}} $ . In particular, the reversal effect of current direction can be realized by tuning $ L_\textrm{P} $ . More interestingly, the current-phase relationship exhibits the platform behaviors, which can be manipulated by $ L_\textrm{P} $ and the pumping strength. All the above pumping properties are attributed to the adiabatic evolution of TIS and non-topologically QIS, particularly the conversion between each other is the crucial origin. We also obtain the quantized pumping current by adjusting $ L_\textrm{P}$ and L _0 , and present the corresponding qualitative explanation through the pumping contour circled by the two parameters. In addition, we discuss the features of pumping current based on the armchair graphene as well.https://doi.org/10.1088/1367-2630/ad149bsuperconducting charge pumpinterface stategraphene |
| spellingShingle | Zixuan Ding Sake Wang Mengyao Li Yongchun Tao Jun Wang Superconducting pump manipulated by non-topologically quasi and topological interface states New Journal of Physics superconducting charge pump interface state graphene |
| title | Superconducting pump manipulated by non-topologically quasi and topological interface states |
| title_full | Superconducting pump manipulated by non-topologically quasi and topological interface states |
| title_fullStr | Superconducting pump manipulated by non-topologically quasi and topological interface states |
| title_full_unstemmed | Superconducting pump manipulated by non-topologically quasi and topological interface states |
| title_short | Superconducting pump manipulated by non-topologically quasi and topological interface states |
| title_sort | superconducting pump manipulated by non topologically quasi and topological interface states |
| topic | superconducting charge pump interface state graphene |
| url | https://doi.org/10.1088/1367-2630/ad149b |
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