Flat-Band AC Transport in Nanowires
The electronic states in flat bands possess zero group velocity and null charge mobility. Recently, flat electronic bands with fully localized states have been predicted in nanowires, when their hopping integrals between first, second, and third neighbors satisfy determined relationships. Experiment...
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MDPI AG
2024-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/15/1/38 |
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| _version_ | 1841549114304626688 |
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| author | Vicenta Sánchez Chumin Wang |
| author_facet | Vicenta Sánchez Chumin Wang |
| author_sort | Vicenta Sánchez |
| collection | DOAJ |
| description | The electronic states in flat bands possess zero group velocity and null charge mobility. Recently, flat electronic bands with fully localized states have been predicted in nanowires, when their hopping integrals between first, second, and third neighbors satisfy determined relationships. Experimentally, these relationships can only be closely achieved under external pressures. In this article, we study the alternating current (AC) in such nanowires having nearly flat electronic bands by means of a new independent channel method developed for the Kubo–Greenwood formula including hopping integrals up to third neighbors. The results reveal a large AC conductivity sensitive to the boundary conditions of measurement, where the charge carriers resonate with the external electric field by oscillating around their localized positions. |
| format | Article |
| id | doaj-art-f7471be9473a46e0846efae7f1f0a485 |
| institution | Kabale University |
| issn | 2079-4991 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-f7471be9473a46e0846efae7f1f0a4852025-01-10T13:19:19ZengMDPI AGNanomaterials2079-49912024-12-011513810.3390/nano15010038Flat-Band AC Transport in NanowiresVicenta Sánchez0Chumin Wang1Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City 04510, MexicoInstituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Mexico City 04510, MexicoThe electronic states in flat bands possess zero group velocity and null charge mobility. Recently, flat electronic bands with fully localized states have been predicted in nanowires, when their hopping integrals between first, second, and third neighbors satisfy determined relationships. Experimentally, these relationships can only be closely achieved under external pressures. In this article, we study the alternating current (AC) in such nanowires having nearly flat electronic bands by means of a new independent channel method developed for the Kubo–Greenwood formula including hopping integrals up to third neighbors. The results reveal a large AC conductivity sensitive to the boundary conditions of measurement, where the charge carriers resonate with the external electric field by oscillating around their localized positions.https://www.mdpi.com/2079-4991/15/1/38flat bandAC conductivityKubo–Greenwood formulaindependent channel method |
| spellingShingle | Vicenta Sánchez Chumin Wang Flat-Band AC Transport in Nanowires Nanomaterials flat band AC conductivity Kubo–Greenwood formula independent channel method |
| title | Flat-Band AC Transport in Nanowires |
| title_full | Flat-Band AC Transport in Nanowires |
| title_fullStr | Flat-Band AC Transport in Nanowires |
| title_full_unstemmed | Flat-Band AC Transport in Nanowires |
| title_short | Flat-Band AC Transport in Nanowires |
| title_sort | flat band ac transport in nanowires |
| topic | flat band AC conductivity Kubo–Greenwood formula independent channel method |
| url | https://www.mdpi.com/2079-4991/15/1/38 |
| work_keys_str_mv | AT vicentasanchez flatbandactransportinnanowires AT chuminwang flatbandactransportinnanowires |