Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications
The research progress toward creating efficient light sources on graphene-based electronic-photonic integrated circuits has been relatively sluggish, mainly because of graphene’s zero-bandgap nature. Recently, strain-induced pseudo-magnetic fields in graphene have attracted particular interest due t...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis-Doctor of Philosophy |
| Language: | English |
| Published: |
Nanyang Technological University
2022
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/161423 |
| _version_ | 1826130057229238272 |
|---|---|
| author | Luo, Manlin |
| author2 | Nam Donguk |
| author_facet | Nam Donguk Luo, Manlin |
| author_sort | Luo, Manlin |
| collection | NTU |
| description | The research progress toward creating efficient light sources on graphene-based electronic-photonic integrated circuits has been relatively sluggish, mainly because of graphene’s zero-bandgap nature. Recently, strain-induced pseudo-magnetic fields in graphene have attracted particular interest due to their capability to mimic real magnetic fields and create energy gaps, emerging as a promising route to favor the realization of integrated graphene optoelectronic devices.
Theoretical and experimental work on generating strain-induced pseudo-magnetic fields in graphene has been demonstrated. In the meantime, scanning tunneling spectroscopy has repeatedly witnessed the pseudo-Landau levels in strained graphene and verified the existence of pseudo-magnetic fields. However, the effect of pseudo-magnetic fields has been rarely explored in graphene thus far. Moreover, previous attempts to experimentally achieve strain-induced pseudo-magnetic fields have mostly been limited to the nanometer scale, making it challenging to harness them in graphene-based optoelectronic applications.
In this thesis, we focus on investigating strain-induced pseudo-magnetic fields in graphene. Starting from fabricating highly strained graphene on nanopillars, we demonstrate how pseudo-magnetic fields change the optical properties of graphene. In the second part, we experimentally induce quasi- uniform pseudo-magnetic fields over an area that can be at the micrometer scale. The demonstrated platform allows customizing the strain distribution in a simple and reproducible way. Using theoretical simulations, we also present the possibility of creating an efficient graphene-based laser. Lastly, I strive to show that graphene holds the potential to act as a light source material by employing ultrafast photoluminescence measurement. Throughout this thesis, we discuss the realization and effect of strain-induced pseudo-magnetic fields in graphene that will help pave the way towards facilitating graphene-based light sources and completing graphene-based electronic-photonic integrated circuits. |
| first_indexed | 2024-10-01T07:50:38Z |
| format | Thesis-Doctor of Philosophy |
| id | ntu-10356/161423 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:50:38Z |
| publishDate | 2022 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1614232022-10-04T01:04:34Z Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications Luo, Manlin Nam Donguk School of Electrical and Electronic Engineering dnam@ntu.edu.sg Engineering::Nanotechnology The research progress toward creating efficient light sources on graphene-based electronic-photonic integrated circuits has been relatively sluggish, mainly because of graphene’s zero-bandgap nature. Recently, strain-induced pseudo-magnetic fields in graphene have attracted particular interest due to their capability to mimic real magnetic fields and create energy gaps, emerging as a promising route to favor the realization of integrated graphene optoelectronic devices. Theoretical and experimental work on generating strain-induced pseudo-magnetic fields in graphene has been demonstrated. In the meantime, scanning tunneling spectroscopy has repeatedly witnessed the pseudo-Landau levels in strained graphene and verified the existence of pseudo-magnetic fields. However, the effect of pseudo-magnetic fields has been rarely explored in graphene thus far. Moreover, previous attempts to experimentally achieve strain-induced pseudo-magnetic fields have mostly been limited to the nanometer scale, making it challenging to harness them in graphene-based optoelectronic applications. In this thesis, we focus on investigating strain-induced pseudo-magnetic fields in graphene. Starting from fabricating highly strained graphene on nanopillars, we demonstrate how pseudo-magnetic fields change the optical properties of graphene. In the second part, we experimentally induce quasi- uniform pseudo-magnetic fields over an area that can be at the micrometer scale. The demonstrated platform allows customizing the strain distribution in a simple and reproducible way. Using theoretical simulations, we also present the possibility of creating an efficient graphene-based laser. Lastly, I strive to show that graphene holds the potential to act as a light source material by employing ultrafast photoluminescence measurement. Throughout this thesis, we discuss the realization and effect of strain-induced pseudo-magnetic fields in graphene that will help pave the way towards facilitating graphene-based light sources and completing graphene-based electronic-photonic integrated circuits. Doctor of Philosophy 2022-09-01T01:21:41Z 2022-09-01T01:21:41Z 2022 Thesis-Doctor of Philosophy Luo, M. (2022). Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/161423 https://hdl.handle.net/10356/161423 10.32657/10356/161423 en This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University |
| spellingShingle | Engineering::Nanotechnology Luo, Manlin Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications |
| title | Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications |
| title_full | Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications |
| title_fullStr | Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications |
| title_full_unstemmed | Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications |
| title_short | Strain-induced pseudo-magnetic fields in graphene for novel optoelectronic applications |
| title_sort | strain induced pseudo magnetic fields in graphene for novel optoelectronic applications |
| topic | Engineering::Nanotechnology |
| url | https://hdl.handle.net/10356/161423 |
| work_keys_str_mv | AT luomanlin straininducedpseudomagneticfieldsingraphenefornoveloptoelectronicapplications |