Inelastic tunneling into multipolaronic bound states in single-layer MoS$_2$
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866913841913266176 |
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| author | van Efferen, Camiel Pätzold, Laura Tounsi, Tfyeche Y. Schobert, Arne Winter, Michael Veld, Yann in 't Georger, Mark Safeer, Affan Krämer, Christian Fischer, Jeison Berges, Jan Michely, Thomas Mozara, Roberto Wehling, Tim Jolie, Wouter |
| author_facet | van Efferen, Camiel Pätzold, Laura Tounsi, Tfyeche Y. Schobert, Arne Winter, Michael Veld, Yann in 't Georger, Mark Safeer, Affan Krämer, Christian Fischer, Jeison Berges, Jan Michely, Thomas Mozara, Roberto Wehling, Tim Jolie, Wouter |
| contents | Polarons are quasiparticles that arise from the interaction of electrons or holes with lattice vibrations. Though polarons are well-studied across multiple disciplines, experimental observations of polarons in two-dimensional crystals are sparse. We use scanning tunneling microscopy and spectroscopy to measure inelastic excitations of polaronic bound states emerging from coupling of non-polar zone-boundary phonons to Bloch electrons in n-doped metallic single-layer MoS$_2$. The latter is kept chemically pristine via contactless chemical doping. Tunneling into the vibrationally coupled polaronic states leads to a series of evenly spaced peaks in the differential conductance on either side of the Fermi level. Combining density functional (perturbation) theory with a recently developed ab initio electron-lattice downfolding technique, we show that the energy spacing stems from the longitudinal-acoustic phonon mode that flattens at the Brillouin zone edge and is responsible for the formation of stable multipolarons in metallic MoS$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10972 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Inelastic tunneling into multipolaronic bound states in single-layer MoS$_2$ van Efferen, Camiel Pätzold, Laura Tounsi, Tfyeche Y. Schobert, Arne Winter, Michael Veld, Yann in 't Georger, Mark Safeer, Affan Krämer, Christian Fischer, Jeison Berges, Jan Michely, Thomas Mozara, Roberto Wehling, Tim Jolie, Wouter Mesoscale and Nanoscale Physics Materials Science Polarons are quasiparticles that arise from the interaction of electrons or holes with lattice vibrations. Though polarons are well-studied across multiple disciplines, experimental observations of polarons in two-dimensional crystals are sparse. We use scanning tunneling microscopy and spectroscopy to measure inelastic excitations of polaronic bound states emerging from coupling of non-polar zone-boundary phonons to Bloch electrons in n-doped metallic single-layer MoS$_2$. The latter is kept chemically pristine via contactless chemical doping. Tunneling into the vibrationally coupled polaronic states leads to a series of evenly spaced peaks in the differential conductance on either side of the Fermi level. Combining density functional (perturbation) theory with a recently developed ab initio electron-lattice downfolding technique, we show that the energy spacing stems from the longitudinal-acoustic phonon mode that flattens at the Brillouin zone edge and is responsible for the formation of stable multipolarons in metallic MoS$_2$. |
| title | Inelastic tunneling into multipolaronic bound states in single-layer MoS$_2$ |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2505.10972 |