Coherent acoustic phonons in van der Waals nanolayers and heterostructures
Terahertz (THz) and sub-THz coherent acoustic phonons have been successfully used as probes of various quantum systems. Since their wavelength is in the nanometer range, they can probe nanostructures buried below a surface with nanometer resolution and enable control of electrical and optical proper...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
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American Physical Society
2018
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| Online Access: | https://eprints.nottingham.ac.uk/52869/ |
| _version_ | 1848798828408340480 |
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| author | Greener, Jake D.G. Akimov, Andrey V. Gusev, V. Kudrynskyi, Zakhar Beton, Peter H. Kovalyuk, Zakhar D. Taniguchi, Takashi Watanabe, Kenji Kent, A.J. Patanè, Amalia |
| author_facet | Greener, Jake D.G. Akimov, Andrey V. Gusev, V. Kudrynskyi, Zakhar Beton, Peter H. Kovalyuk, Zakhar D. Taniguchi, Takashi Watanabe, Kenji Kent, A.J. Patanè, Amalia |
| author_sort | Greener, Jake D.G. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Terahertz (THz) and sub-THz coherent acoustic phonons have been successfully used as probes of various quantum systems. Since their wavelength is in the nanometer range, they can probe nanostructures buried below a surface with nanometer resolution and enable control of electrical and optical properties on a picosecond time scale. However, coherent acoustic phonons have not yet been widely used to study van der Waals (vdW) two-dimensional (2D) materials and heterostructures. This class of 2D systems features strong covalent bonding of atoms in the layer planes and weak van der Waals attraction between the layers. The dynamical properties of the interface between the layers or between a layer and its supporting substrate are often omitted as they are difficult to probe. On the other hand, these play a crucial role in interpreting experiments and/or designing new device structures. Here we use picosecond ultrasonic techniques to investigate phonon transport in vdW InSe nanolayers and InSe/hBN heterostructures. Coherent acoustic phonons are generated and detected in these 2D systems and allow us to probe elastic parameters of different layers and their interfaces. In particular, our study of the elastic properties of the interface between vdW layers reveals a strong coupling over a wide range of frequencies up to 0.1 THz, offering prospects for high-frequency electronics and technologies that require control over the charge and phonon transport across an interface. In contrast, we reveal a weak coupling between the InSe nanolayers and sapphire substrates, relevant in thermoelectrics and sensing applications, which can require quasi-suspended layers. |
| first_indexed | 2025-11-14T20:25:58Z |
| format | Article |
| id | nottingham-52869 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:25:58Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-528692020-05-04T19:42:53Z https://eprints.nottingham.ac.uk/52869/ Coherent acoustic phonons in van der Waals nanolayers and heterostructures Greener, Jake D.G. Akimov, Andrey V. Gusev, V. Kudrynskyi, Zakhar Beton, Peter H. Kovalyuk, Zakhar D. Taniguchi, Takashi Watanabe, Kenji Kent, A.J. Patanè, Amalia Terahertz (THz) and sub-THz coherent acoustic phonons have been successfully used as probes of various quantum systems. Since their wavelength is in the nanometer range, they can probe nanostructures buried below a surface with nanometer resolution and enable control of electrical and optical properties on a picosecond time scale. However, coherent acoustic phonons have not yet been widely used to study van der Waals (vdW) two-dimensional (2D) materials and heterostructures. This class of 2D systems features strong covalent bonding of atoms in the layer planes and weak van der Waals attraction between the layers. The dynamical properties of the interface between the layers or between a layer and its supporting substrate are often omitted as they are difficult to probe. On the other hand, these play a crucial role in interpreting experiments and/or designing new device structures. Here we use picosecond ultrasonic techniques to investigate phonon transport in vdW InSe nanolayers and InSe/hBN heterostructures. Coherent acoustic phonons are generated and detected in these 2D systems and allow us to probe elastic parameters of different layers and their interfaces. In particular, our study of the elastic properties of the interface between vdW layers reveals a strong coupling over a wide range of frequencies up to 0.1 THz, offering prospects for high-frequency electronics and technologies that require control over the charge and phonon transport across an interface. In contrast, we reveal a weak coupling between the InSe nanolayers and sapphire substrates, relevant in thermoelectrics and sensing applications, which can require quasi-suspended layers. American Physical Society 2018-06-29 Article PeerReviewed Greener, Jake D.G., Akimov, Andrey V., Gusev, V., Kudrynskyi, Zakhar, Beton, Peter H., Kovalyuk, Zakhar D., Taniguchi, Takashi, Watanabe, Kenji, Kent, A.J. and Patanè, Amalia (2018) Coherent acoustic phonons in van der Waals nanolayers and heterostructures. Physical Review B . ISSN 2469-9969 (In Press) |
| spellingShingle | Greener, Jake D.G. Akimov, Andrey V. Gusev, V. Kudrynskyi, Zakhar Beton, Peter H. Kovalyuk, Zakhar D. Taniguchi, Takashi Watanabe, Kenji Kent, A.J. Patanè, Amalia Coherent acoustic phonons in van der Waals nanolayers and heterostructures |
| title | Coherent acoustic phonons in van der Waals nanolayers and heterostructures |
| title_full | Coherent acoustic phonons in van der Waals nanolayers and heterostructures |
| title_fullStr | Coherent acoustic phonons in van der Waals nanolayers and heterostructures |
| title_full_unstemmed | Coherent acoustic phonons in van der Waals nanolayers and heterostructures |
| title_short | Coherent acoustic phonons in van der Waals nanolayers and heterostructures |
| title_sort | coherent acoustic phonons in van der waals nanolayers and heterostructures |
| url | https://eprints.nottingham.ac.uk/52869/ |