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Carbone MR, Mayers MZ, Reichman DR. Microscopic model of the doping dependence of linewidths in monolayer transition metal dichalcogenides. J Chem Phys 2020; 152:194705. [PMID: 33687247 DOI: 10.1063/5.0008730] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A fully microscopic model of the doping-dependent exciton and trion linewidths in the absorption spectra of monolayer transition metal dichalcogenides in the low temperature and low-doping regime is explored. The approach is based on perturbation theory and avoids the use of phenomenological parameters. In the low-doping regime, we find that the trion linewidth is relatively insensitive to doping levels, while the exciton linewidth increases monotonically with doping. On the other hand, we argue that the trion linewidth shows a somewhat stronger temperature dependence. The magnitudes of the linewidths are likely to be masked by phonon scattering for T ≥ 20 K in encapsulated samples in the low-doping regime. We discuss the breakdown of perturbation theory, which should occur at relatively low-doping levels and low temperatures. Our work also paves the way toward understanding a variety of related scattering processes, including impact ionization and Auger scattering in clean 2D samples.
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Affiliation(s)
- Matthew R Carbone
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - Matthew Z Mayers
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - David R Reichman
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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Plechinger G, Nagler P, Arora A, Granados Del Águila A, Ballottin MV, Frank T, Steinleitner P, Gmitra M, Fabian J, Christianen PCM, Bratschitsch R, Schüller C, Korn T. Excitonic Valley Effects in Monolayer WS 2 under High Magnetic Fields. NANO LETTERS 2016; 16:7899-7904. [PMID: 27960453 DOI: 10.1021/acs.nanolett.6b04171] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Transition-metal dichalcogenides can be easily produced as atomically thin sheets, exhibiting the possibility to optically polarize and read out the valley pseudospin of extremely stable excitonic quasiparticles present in these 2D semiconductors. Here, we investigate a monolayer of tungsten disulfide in high magnetic fields up to 30 T via photoluminescence spectroscopy at low temperatures. The valley degeneracy is lifted for all optical features, particularly for excitons, singlet and triplet trions, for which we determine the g factor separately. While the observation of a diamagnetic shift of the exciton and trion resonances gives us insight into the real-space extension of these quasiparticles, magnetic field-induced valley polarization effects shed light onto the exciton and trion dispersion relations in reciprocal space. The field dependence of the trion valley polarizations is in line with the predicted trion splitting into singlet and triplet configurations.
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Affiliation(s)
- Gerd Plechinger
- Institut für Experimentelle und Angewandte Physik, Universität Regensburg , D-93040 Regensburg, Germany
| | - Philipp Nagler
- Institut für Experimentelle und Angewandte Physik, Universität Regensburg , D-93040 Regensburg, Germany
| | - Ashish Arora
- Institute of Physics and Center for Nanotechnology, University of Münster , 48149 Münster, Germany
| | - Andrés Granados Del Águila
- High Field Magnet Laboratory (HFML-EMFL), Radboud University , Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Mariana V Ballottin
- High Field Magnet Laboratory (HFML-EMFL), Radboud University , Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Tobias Frank
- Institut für Theoretische Physik, Universität Regensburg , D-93040 Regensburg, Germany
| | - Philipp Steinleitner
- Institut für Experimentelle und Angewandte Physik, Universität Regensburg , D-93040 Regensburg, Germany
| | - Martin Gmitra
- Institut für Theoretische Physik, Universität Regensburg , D-93040 Regensburg, Germany
| | - Jaroslav Fabian
- Institut für Theoretische Physik, Universität Regensburg , D-93040 Regensburg, Germany
| | - Peter C M Christianen
- High Field Magnet Laboratory (HFML-EMFL), Radboud University , Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Rudolf Bratschitsch
- Institute of Physics and Center for Nanotechnology, University of Münster , 48149 Münster, Germany
| | - Christian Schüller
- Institut für Experimentelle und Angewandte Physik, Universität Regensburg , D-93040 Regensburg, Germany
| | - Tobias Korn
- Institut für Experimentelle und Angewandte Physik, Universität Regensburg , D-93040 Regensburg, Germany
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Zhu JL, Lin DL, Kawazoe Y. Energy levels of D0 and D- in graded quantum-well structures of GaAs/Ga1-xAlxAs under magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:16786-16791. [PMID: 9985808 DOI: 10.1103/physrevb.54.16786] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Gekhtman D, Cohen E, Ron A, Pfeiffer LN. Charged and neutral exciton phase formation in the magnetically quantized two-dimensional electron gas. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:10320-10323. [PMID: 9984813 DOI: 10.1103/physrevb.54.10320] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Manassen A, Cohen E, Ron A, Linder E, Pfeiffer LN. Exciton and trion spectral line shape in the presence of an electron gas in GaAs/AlAs quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:10609-10613. [PMID: 9984857 DOI: 10.1103/physrevb.54.10609] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Shields AJ, Pepper M, Simmons MY, Ritchie DA. Spin-triplet negatively charged excitons in GaAs quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:7841-7844. [PMID: 9979768 DOI: 10.1103/physrevb.52.7841] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zhu JL, Xu S. Binding and transition energies of off-center D- impurity states in quantum wells and magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:12175-12178. [PMID: 9975363 DOI: 10.1103/physrevb.50.12175] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zhu JL, Zhao JH, Xiong JJ. Dimensionality and potential-shape effects on D0 and D- ground states in quantum dots. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:1832-1838. [PMID: 9976372 DOI: 10.1103/physrevb.50.1832] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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