National Science Open (Jun 2023)
Real- and momentum-indirect neutral and charged excitons in a multi-valley semiconductor
- Huang Zhiheng,
- Li Yuhui,
- Bo Tao,
- Zhao Yanchong,
- Wu Fanfan,
- Li Lu,
- Yuan Yalong,
- Ji Yiru,
- Liu Le,
- Tian Jinpeng,
- Chu Yanbang,
- Zan Xiaozhou,
- Peng Yalin,
- Li Xiuzhen,
- Zhang Yangkun,
- Watanabe Kenji,
- Taniguchi Takashi,
- Sun Zhipei,
- Yang Wei,
- Shi Dongxia,
- Du Shixuan,
- Du Luojun,
- Zhang Guangyu
Affiliations
- Huang Zhiheng
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Li Yuhui
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Bo Tao
- ["Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China"]
- Zhao Yanchong
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Wu Fanfan
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Li Lu
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Yuan Yalong
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Ji Yiru
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Liu Le
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Tian Jinpeng
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Chu Yanbang
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Zan Xiaozhou
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Peng Yalin
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Li Xiuzhen
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Zhang Yangkun
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China"]
- Watanabe Kenji
- ["Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan"]
- Taniguchi Takashi
- ["International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan"]
- Sun Zhipei
- ["Department of Electronics and Nanoengineering, Aalto University, Tietotie 3, Espoo FI-02150, Finland","Quantum Technology Finland (QTF) Centre of Excellence, Department of Applied Physics, Aalto University, Aalto FI-00076, Finland"]
- Yang Wei
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China","Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China"]
- Shi Dongxia
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China","Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China"]
- Du Shixuan
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China","Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China"]
- Du Luojun
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China","Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China"]
- Zhang Guangyu
- ["Beijing National Laboratory for Condensed Matter Physics, Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China","School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China","Beijing Key Laboratory for Nanomaterials and Nanodevices, Beijing 100190, China","Songshan Lake Materials Laboratory, Dongguan 523808, China"]
- DOI
- https://doi.org/10.1360/nso/20220060
- Journal volume & issue
-
Vol. 2
Abstract
Excitons dominate the photonic and optoelectronic properties of a material. Although significant advancements exist in understanding various types of excitons, progress on excitons that are indirect in both real- and momentum-spaces is still limited. Here, we demonstrate the real- and momentum-indirect neutral and charged excitons (including their phonon replicas) in a multi-valley semiconductor of bilayer MoS2, by performing electric-field/doping-density dependent photoluminescence. Together with first-principles calculations, we uncover that the observed real- and momentum-indirect exciton involves electron/hole from K/Γ valley, solving the longstanding controversy of its momentum origin. Remarkably, the binding energy of real- and momentum-indirect charged exciton is extremely large (i.e., ~59 meV), more than twice that of real- and momentum-direct charged exciton (i.e., ~24 meV). The giant binding energy, along with the electrical tunability and long lifetime, endows real- and momentum-indirect excitons an emerging platform to study many-body physics and to illuminate developments in photonics and optoelectronics.
Keywords
- excitons
- real- and momentum-indirect exciton
- giant binding energy
- electrical tunability
- multi-valley semiconductor
