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Título:
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Excitons, trions and Rydberg states in monolayer MoS_2 revealed by low-temperature photocurrent spectroscopy
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Autores:
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Vaquero, Daniel ;
Clericò, Vito ;
Salvador Sánchez, Juan ;
Martín Ramos, Adrián ;
Díaz García, Elena ;
Domínguez-Adame Acosta, Francisco ;
Meziani, Yahya M ;
Díez, Enrique ;
Quereda, Jorge
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Tipo de documento:
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texto impreso
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Editorial:
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Nature, 2020-10-30
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Dimensiones:
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application/pdf
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Nota general:
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cc_by
info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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Exciton physics in two-dimensional semiconductors are typically studied by photoluminescence spectroscopy. However, this technique does not allow for direct observation of non-radiating excitonic transitions. Here, we use low-temperature photocurrent spectroscopy as an alternative technique to investigate excitonic transitions in a high-quality monolayer MoS_2 phototransistor. The resulting spectra presents excitonic peaks with linewidths as low as 8 meV. We identify spectral features corresponding to the ground states of neutral excitons (X^A_(1s) and X^B_(1s) and charged trions (T^A and T^B) as well as up to eight additional spectral lines at energies above the X^B_(1s) transition, which we attribute to the Rydberg series of excited states of X^A and X^B. The intensities of the spectral features can be tuned by the gate and drain-source voltages. Using an effective-mass theory for excitons in two-dimensional systems we are able to accurately fit the measured spectral lines and unambiguously associate them with their corresponding Rydberg states.
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En línea:
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https://eprints.ucm.es/id/eprint/63204/1/DiazGarciaE%2014%20LIBRE%2BCC.pdf
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