Two-photon absorption within layered Bi<sub>2</sub>Te<sub>3</sub> topological insulators and the role of nonlinear transmittance therein

Qiao, Jian‐Tian; Chuang, M.J.; Lan, Jia‐Chi; Lin, Yuan-Yao; Sung, Wei-Heng; Fan, Rong; Wu, Mengyu; Lee, Chi-Yang; Chen, Chun‐Hu; Liu, Hong; Lee, Chao-Kuei

doi:10.1039/c9tc01885a

Cited by 26 publications

(15 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 2PA coefficient of MXene is relatively small in comparison to that of some other 2D materials such as 2D TMDs, Bi 2 Te 3 , and graphene. [ 2d,16 ] The 2PA coefficient (≈0.2 cm W −1 ) of graphene is enhanced by the excitonic Fano resonance at the saddle point. [ 2d ] Meanwhile, additional bands arising from the interlayer interactions in the bilayer graphene enhance the second‐order extinction.…”

Section: Figurementioning

confidence: 99%

Two‐Photon Absorption in Monolayer MXenes

Wang

Bennett

Zhang

et al. 2020

Advanced Optical Materials

View full text Add to dashboard Cite

an NLO effect where an electron absorbs two photons simultaneously and is excited from the ground state via a virtual state. 2PA generally occurs when the gap between the ground and excited states is larger than the energy of one photon but smaller than the energy of two photons. Hence, one-photon absorption (1PA) dominates when light interacts with a small bandgap semiconductor or gapless metal. Interestingly, 2PA instead of 1PA can be the dominant optical transition process in narrow bandgap materials under the right circumstances, but it is a challenge to experimentally observe this unusual optical phenomenon in bulk materials. This phenomenon, however, becomes possible in 2D materials thanks to their interesting electronic structures. Giant 2PA was reported in gapless bilayer graphene with four bands under the irradiation of 780 and 1100 nm photons. [2a] This 2PA could happen because the two-photon transitions are enhanced due to the additional bands arising from the interlayer interactions in the bilayer system, which are absent from monolayer graphene. To date, bilayer graphene is the only gapless semimetal in which the unconventional 2PA has been observed experimentally. The question remains whether or not it is possible to observe 2PA in a material, which does not have a similar electronic structure to that of bilayer graphene or conventional semiconductors.Two-photon absorption (2PA) is a nonlinear optical (NLO) effect that typically occurs in a conventional semiconductor whose bandgap is larger than the energy of one excited photon but smaller than the energy of two photons. In this work, the experimental observation of strong 2PA in gapless MXene monolayers is reported. This phenomenon is verified by a nonlinear transmission method and ultrafast dynamic studies based on a wavelengthdegenerate, non-collinear pump-probe technique. The unconventional 2PA is attributed to the structures of the MXene energy bands near the Fermi level, which favors two-photon transitions and suppresses one-photon transitions due to parallel band absorption effects. These results, as well as the measured NLO parameters including the 2PA coefficient, absorption crosssection, excited carrier lifetimes, and third-order NLO susceptibility, provide a systematic understanding of the unusual NLO effect in MXenes and may be applied in advanced photonic and optoelectronic devices.Light-matter interactions in 2D materials have been in the spotlight of recent optics research because of the novel applications in nanoelectronics, valleytronics, photovoltaics, and nanophotonics that they will potentially enable. [1] In the field of nonlinear optics (NLO), some 2D nanosheets, such as graphene and monolayer MoS 2 , have been experimentally observed to exhibit strong two-photon absorption (2PA). [2] This interesting NLO phenomenon has a wide range of applications in optical limiting, all-optical switching, logic, [3] storage memory, [4] and 3D lithography and printing. [5] 2PA isThe ORCID identification number(s) for the author(s) of thi...

show abstract

Section: Figurementioning

confidence: 99%

Two‐Photon Absorption in Monolayer MXenes

Wang

Bennett

Zhang

et al. 2020

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…30 To search for a feasible solution to improve the oversaturation problem, Qiao et al explored the optical nonlinearity of Bi 2 Te 3 by using the z -scan technique. 31 Single-photon absorption (SPA) and large two-photon absorption (TPA) were observed. Inspired by the concept of heterostructures, Wang's and Mu's group successfully demonstrated a mode-locking fiber laser using the fabricated graphene/Bi 2 Te 3 heterostructures as a saturable absorber.…”

Section: Introductionmentioning

confidence: 99%

Evolution of optical nonlinearity within a graphene/Bi₂Te₃ heterostructure

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the last decade, with the discovery of topological insulators (Cava et al, 2013;Kou et al, 2013;Zhao et al, 2013;Shen and Cha, 2014;Wang et al, 2014;Luo et al, 2015;Zhou et al, 2015;Liu et al, 2016;Chen et al, 2017a;Loïc and Izmaylov, 2017;Pan et al, 2017;Pielnhofer et al, 2017;Politano et al, 2017;Andrey et al, 2018;Hu et al, 2018Hu et al, , 2019Gao et al, 2019;Mal et al, 2019;Qiao et al, 2019;Narimani et al, 2020), topologically non-trivial materials have attracted significant interest in the chemistry, physics, and materials science communities. Recently, studies have increasingly focused on topological semimetals/metals (Bin et al, 2018;Chenguang et al, 2018;Zhou et al, 2018;He et al, 2019He et al, , 2020Jin et al, 2019aJin et al, , 2020bLi et al, 2019;Qie et al, 2019;Xie et al, 2019;Yi et al, 2019;Zhong et al, 2019;Ma and Sun, 2020;Meng et al, 2020b;Wang et al, 2020a,c,d;Yang and Zhang, 2020;Zhang et al, 2020;Zhao et al, 2020) with non-trivial band topology.…”

Section: Introductionmentioning

confidence: 99%

Realization of Opened and Closed Nodal Lines and Four- and Three-fold Degenerate Nodal Points in XPt (X = Sc, Y, La) Intermetallic Compound: A Computational Modeling Study

2020

Front. Chem.

View full text Add to dashboard Cite

Realizing rich topological elements in topological materials has attracted increasing attention in the fields of chemistry, physics, and materials science. Topological semimetals/metals are classified into three main types: nodal-point, nodal-line, and nodal-surface types with zero-, one-, and two-dimensional topological elements, respectively. This study reports that XPt (X = Sc, Y, La) intermetallic compounds are topological metals with opened and closed nodal lines, and triply degenerate nodal points (TNPs) when the spin-orbit coupling (SOC) is ignored. Based on the calculated phonon dispersions, one can find that ScPt and YPt are dynamically stable whereas LaPt is not. When SOC is added, the one-dimensional nodal line and zero-dimensional TNPs disappear. Interestingly, a new zero-dimensional topological element, that is, Dirac points with 4-fold degenerate isolated band crossings with linear band dispersion appear. The proposed materials can be considered a good platform to realize zero-and one-dimensional topological elements in a single compound and to study the relationship between zero-and one-dimensional topological elements.

show abstract

Two-photon absorption within layered Bi₂Te₃ topological insulators and the role of nonlinear transmittance therein

Abstract: In this study, strong two-photon absorption (TPA) in a layered bismuth telluride (Bi2Te3) topological insulator (TI) is observed and investigated by the Z-scan method under excitation with a femtosecond laser pulse at a wavelength of 1056 nm.

Cited by 26 publications

References 50 publications

Two‐Photon Absorption in Monolayer MXenes

Two‐Photon Absorption in Monolayer MXenes

Evolution of optical nonlinearity within a graphene/Bi₂Te₃ heterostructure

Realization of Opened and Closed Nodal Lines and Four- and Three-fold Degenerate Nodal Points in XPt (X = Sc, Y, La) Intermetallic Compound: A Computational Modeling Study

Contact Info

Product

Resources

About

Two-photon absorption within layered Bi2Te3 topological insulators and the role of nonlinear transmittance therein

Abstract: In this study, strong two-photon absorption (TPA) in a layered bismuth telluride (Bi2Te3) topological insulator (TI) is observed and investigated by the Z-scan method under excitation with a femtosecond laser pulse at a wavelength of 1056 nm.

Cited by 26 publications

References 50 publications

Two‐Photon Absorption in Monolayer MXenes

Two‐Photon Absorption in Monolayer MXenes

Evolution of optical nonlinearity within a graphene/Bi2Te3 heterostructure

Realization of Opened and Closed Nodal Lines and Four- and Three-fold Degenerate Nodal Points in XPt (X = Sc, Y, La) Intermetallic Compound: A Computational Modeling Study

Contact Info

Product

Resources

About

Two-photon absorption within layered Bi₂Te₃ topological insulators and the role of nonlinear transmittance therein

Evolution of optical nonlinearity within a graphene/Bi₂Te₃ heterostructure