التفاصيل البيبلوغرافية
| العنوان: |
Exciton-polaron Rydberg states in monolayer MoSe2 and WSe2. |
| المؤلفون: |
Liu, Erfu, van Baren, Jeremiah, Lu, Zhengguang, Taniguchi, Takashi, Watanabe, Kenji, Smirnov, Dmitry, Chang, Yia-Chung, Lui, Chun Hung |
| المصدر: |
Nature Communications; 10/21/2021, Vol. 12 Issue 1, p1-8, 8p |
| مصطلحات موضوعية: |
RYDBERG states, POLARONS, MONOMOLECULAR films, EXCITED states, BORON nitride, TRANSITION metals, REDSHIFT |
| مستخلص: |
Exciton polaron is a hypothetical many-body quasiparticle that involves an exciton dressed with a polarized electron-hole cloud in the Fermi sea. It has been evoked to explain the excitonic spectra of charged monolayer transition metal dichalcogenides, but the studies were limited to the ground state. Here we measure the reflection and photoluminescence of monolayer MoSe2 and WSe2 gating devices encapsulated by boron nitride. We observe gate-tunable exciton polarons associated with the 1 s–3 s exciton Rydberg states. The ground and excited exciton polarons exhibit comparable energy redshift (15~30 meV) from their respective bare excitons. The robust excited states contradict the trion picture because the trions are expected to dissociate in the excited states. When the Fermi sea expands, we observe increasingly severe suppression and steep energy shift from low to high exciton-polaron Rydberg states. Their gate-dependent energy shifts go beyond the trion description but match our exciton-polaron theory. Our experiment and theory demonstrate the exciton-polaron nature of both the ground and excited excitonic states in charged monolayer MoSe2 and WSe2. An exciton polaron is a quasiparticle composed of an exciton dressed with an electron-hole cloud, and this concept has been used to explain the ground excitonic states in charged monolayer transition metal dichalcogenides. Here the authors present experimental and theoretical evidence of exciton-polaron Rydberg states in monolayer MoSe2 and WSe2. [ABSTRACT FROM AUTHOR] |
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