Interlayer Bound Wannier Excitons in Germanium Sulfide
We report a cathodoluminescence (CL) study of layered germanium sulfide (GeS) where we observe a sharp emission peak from flakes covered with a thin hexagonal boron nitride film. GeS is a material that has recently attracted considerable interest due to its emission in the visible region and its str...
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| Published in | Materials Vol. 13; no. 16; p. 3568 |
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| Language | English |
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| Abstract | We report a cathodoluminescence (CL) study of layered germanium sulfide (GeS) where we observe a sharp emission peak from flakes covered with a thin hexagonal boron nitride film. GeS is a material that has recently attracted considerable interest due to its emission in the visible region and its strong anisotropy. The measured CL peak is at ~1.69 eV for samples ranging in thickness from 97 nm to 45 nm, where quantum-confinement effects can be excluded. By performing ab initio ground- and excited-state simulations for the bulk compound, we show that the measured optical peak can be unambiguously explained by radiative recombination of the first free bright bound exciton, which is due to a mixing of direct transitions near the Γ-point of the Brillouin Zone and it is associated to a very large optical anisotropy. The analysis of the corresponding excitonic wave function shows a Wannier–Mott interlayer character, being spread not only in-plane but also out-of-plane. |
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| AbstractList | We report a cathodoluminescence (CL) study of layered germanium sulfide (GeS) where we observe a sharp emission peak from flakes covered with a thin hexagonal boron nitride film. GeS is a material that has recently attracted considerable interest due to its emission in the visible region and its strong anisotropy. The measured CL peak is at ~1.69 eV for samples ranging in thickness from 97 nm to 45 nm, where quantum-confinement effects can be excluded. By performing ab initio ground- and excited-state simulations for the bulk compound, we show that the measured optical peak can be unambiguously explained by radiative recombination of the first free bright bound exciton, which is due to a mixing of direct transitions near theΓ-point of the Brillouin Zone and it is associated to a very large optical anisotropy. The analysis of the corresponding excitonic wave function shows a Wannier–Mott interlayer character, being spread not only in-plane but also out-of-plane. We report a cathodoluminescence (CL) study of layered germanium sulfide (GeS) where we observe a sharp emission peak from flakes covered with a thin hexagonal boron nitride film. GeS is a material that has recently attracted considerable interest due to its emission in the visible region and its strong anisotropy. The measured CL peak is at ~1.69 eV for samples ranging in thickness from 97 nm to 45 nm, where quantum-confinement effects can be excluded. By performing ab initio ground- and excited-state simulations for the bulk compound, we show that the measured optical peak can be unambiguously explained by radiative recombination of the first free bright bound exciton, which is due to a mixing of direct transitions near the Γ-point of the Brillouin Zone and it is associated to a very large optical anisotropy. The analysis of the corresponding excitonic wave function shows a Wannier–Mott interlayer character, being spread not only in-plane but also out-of-plane. We report a cathodoluminescence (CL) study of layered germanium sulfide (GeS) where we observe a sharp emission peak from flakes covered with a thin hexagonal boron nitride film. GeS is a material that has recently attracted considerable interest due to its emission in the visible region and its strong anisotropy. The measured CL peak is at ~1.69 eV for samples ranging in thickness from 97 nm to 45 nm, where quantum-confinement effects can be excluded. By performing ab initio ground- and excited-state simulations for the bulk compound, we show that the measured optical peak can be unambiguously explained by radiative recombination of the first free bright bound exciton, which is due to a mixing of direct transitions near the Γ -point of the Brillouin Zone and it is associated to a very large optical anisotropy. The analysis of the corresponding excitonic wave function shows a Wannier–Mott interlayer character, being spread not only in-plane but also out-of-plane. |
| Author | Camilli, Luca Palummo, Maurizia Postorino, Sara Lee Cheong Lem, Laurent O. Sun, Jianbo Fiedler, Saskia |
| AuthorAffiliation | 3 Centre for Nano Optics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark; safi@mci.sdu.dk 5 Istituto Nazionale di Fisica Nucleare, via della Ricerca Scientifica 1, 00133 Roma, Italy 1 Dipartimento di Fisica, Università degli studi di Roma “Tor Vergata”, via della Ricerca Scientifica 1, 00133 Roma, Italy; sara.postorino@uniroma2.it 2 Department of Physics, Technical University of Denmark, Ørsteds Plads, 2800 Kgs. Lyngby, Denmark; jisun@dtu.dk 4 Australian National Fabrication Facility, Australian National University, Canberra 2601, ACT, Australia; u1077231@anu.edu.au |
| AuthorAffiliation_xml | – name: 3 Centre for Nano Optics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark; safi@mci.sdu.dk – name: 5 Istituto Nazionale di Fisica Nucleare, via della Ricerca Scientifica 1, 00133 Roma, Italy – name: 2 Department of Physics, Technical University of Denmark, Ørsteds Plads, 2800 Kgs. Lyngby, Denmark; jisun@dtu.dk – name: 1 Dipartimento di Fisica, Università degli studi di Roma “Tor Vergata”, via della Ricerca Scientifica 1, 00133 Roma, Italy; sara.postorino@uniroma2.it – name: 4 Australian National Fabrication Facility, Australian National University, Canberra 2601, ACT, Australia; u1077231@anu.edu.au |
| Author_xml | – sequence: 1 givenname: Sara orcidid: 0000-0002-5044-8730 surname: Postorino fullname: Postorino, Sara – sequence: 2 givenname: Jianbo orcidid: 0000-0001-9741-8726 surname: Sun fullname: Sun, Jianbo – sequence: 3 givenname: Saskia orcidid: 0000-0002-7753-0814 surname: Fiedler fullname: Fiedler, Saskia – sequence: 4 givenname: Laurent O. surname: Lee Cheong Lem fullname: Lee Cheong Lem, Laurent O. – sequence: 5 givenname: Maurizia orcidid: 0000-0002-3097-8523 surname: Palummo fullname: Palummo, Maurizia – sequence: 6 givenname: Luca orcidid: 0000-0003-2498-0210 surname: Camilli fullname: Camilli, Luca |
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| Snippet | We report a cathodoluminescence (CL) study of layered germanium sulfide (GeS) where we observe a sharp emission peak from flakes covered with a thin hexagonal... |
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| SubjectTerms | 2D materials Anisotropy Boron nitride Brillouin zones Cathodoluminescence density functional theory Emission Excitons Germanium Germanium sulfide Interlayers many body perturbation theory Optical properties Physical properties Radiative recombination Simulation Spectrum analysis Symmetry Wave functions |
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| Title | Interlayer Bound Wannier Excitons in Germanium Sulfide |
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