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Research Article | Open Access

Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer grapheme

Eva A. A. Pogna1, Xianchong Miao2, Driele von Dreifus3, Thonimar V. Alencar4, Marcus V. O. Moutinho5, Pedro Venezuela6, Cristian Manzoni7, Minbiao Ji2( ), Giulio Cerullo7( ), Ana Maria de Paula3( )
Istituto di Nanoscienze CNR-NANO, Laboratory NEST, Piazza San Silvestro 12, Pisa 56127, Italy
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte-MG 31270-901, Brazil
Departamento de Física, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Ouro Preto-MG 35400-000, Brazil
Núcleo Multidisciplinar de Pesquisas em Computação - NUMPEX-COMP, Campus Duque de Caxias, Universidade Federal do Rio de Janeiro, Duque de Caxias-RJ 25265-970, Brazil
Instituto de Física, Universidade Federal Fluminense, UFF, Niterói-RJ 24210-346, Brazil
IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, Milano 20133, Italy
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Graphical Abstract

Abstract

Van der Waals heterostructures obtained by artificially stacking two-dimensional crystals represent the frontier of material engineering, demonstrating properties superior to those of the starting materials. Fine control of the interlayer twist angle has opened new possibilities for tailoring the optoelectronic properties of these heterostructures. Twisted bilayer graphene with a strong interlayer coupling is a prototype of twisted heterostructure inheriting the intriguing electronic properties of graphene. Understanding the effects of the twist angle on its out-of-equilibrium optical properties is crucial for devising optoelectronic applications. With this aim, we here combine excitation-resolved hot photoluminescence with femtosecond transient absorption microscopy. The hot charge carrier distribution induced by photo-excitation results in peaked absorption bleaching and photo-induced absorption bands, both with pronounced twist angle dependence. Theoretical simulations of the electronic band structure and of the joint density of states enable to assign these bands to the blocking of interband transitions at the van Hove singularities and to photo-activated intersubband transitions. The tens of picoseconds relaxation dynamics of the observed bands is attributed to the angle-dependence of electron and phonon heat capacities of twisted bilayer graphene.

Keywords

twisted bilayer graphenetransient absorption microscopyhot-photoluminescencevan der Waals heterostructuresoptoelectronic propertiesvan Hove singularities

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Nano Research
Volume 14 Issue 8,
August 2021
Pages 2797-2804
DOI: 10.1007/s12274-021-3288-0
Cite this article:
Pogna EAA, Miao X, von Dreifus D, et al. Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer grapheme. Nano Research, 2021, 14(8): 2797-2804. https://doi.org/10.1007/s12274-021-3288-0
Topics:
Electronic propertiesOptical propertiesSemiconductor quantum wellsVan der Waals forces

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Received: 15 July 2020
Revised: 06 December 2020
Accepted: 07 December 2020
Published: 16 January 2021
© The Author(s) 2021

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