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Strongly bound excitons confined in two-dimensional (2D) semiconductors are dipoles with a perfect in-plane orientation. In a vertical stack of semiconducting 2D crystals, such in-plane excitonic dipoles are expected to efficiently couple…

The coupling of light to electrical charge carriers in semiconductors is the foundation of many technological applications. Attosecond transient absorption spectroscopy measures simultaneously how excited electrons and the vacancies they…

Materials Science · Physics 2023-05-03 Z. Schumacher , S. A. Sato , S. Neb , A. Niedermayr , L. Gallmann , A. Rubio , U. Keller

The strong light-matter interaction in monolayer transition metal dichalcogenides (TMDs) is promising for nanoscale optoelectronics with their direct band gap nature and the ultra-fast radiative decay of the strongly bound excitons these…

Mesoscale and Nanoscale Physics · Physics 2019-05-27 Medha Dandu , Rabindra Biswas , Sarthak Das , Sangeeth Kallatt , Suman Chatterjee , Mehak Mahajan , Varun Raghunathan , Kausik Majumdar

Recent experimental advances in atomically thin transition metal dichalcogenide (TMD) metals have unveiled a range of interesting phenomena including the coexistence of charge-density-wave (CDW) order and superconductivity down to the…

Superconductivity · Physics 2016-08-31 Xiaoxiang Xi , Helmuth Berger , László Forró , Jie Shan , Kin Fai Mak

When exploring new materials for their potential in (opto)electronic device applications, it is important to understand the role of various carrier interaction and scattering processes. Research on transition metal dichalcogenide (TMD)…

Two-dimensional Transition-Metal Dichalcogenides (TMDs) are of great interest for second harmonic (SH) generation due to their large second-order susceptibility, atomically thin structure, and relaxed phase-matching conditions. TMDs are…

In bilayers of two-dimensional (2D) semiconductors with stacking arrangements which lack inversion symmetry charge transfer between the layers due to layer-asymmetric interband hybridisation can generate a potential difference between the…

Mesoscale and Nanoscale Physics · Physics 2021-07-01 F. Ferreira , V. V. Enaldiev , V. I. Fal'ko , S. J. Magorrian

The dynamics of the photoinduced commensurate to incommensurate charge density wave (CDW) phase transition in 4Hb-TaSe2 are investigated by femtosecond electron diffraction. In the perturbative regime the CDW reforms on a 150 ps timescale,…

Strongly Correlated Electrons · Physics 2015-06-11 N. Erasmus , M. Eichberger , K. Haupt , I. Boshoff , G. Kassier , R. Birmurske , H. Berger , J. Demsar , H. Schwoerer

Assembling transition metal dichalcogenides (TMDCs) at the two-dimensional (2D) limit is a promising approach for tailoring emerging states of matter such as superconductivity or charge density waves (CDWs). Single-layer (SL) VSe$_2$ stands…

Atomically thin vanadium diselenide (VSe2 ) is a two-dimensional transition metal dichalcogenide exhibiting attractive properties due to its metallic 1T-phase. With the recent development of methods to manufacture high-quality monolayer VSe…

Strongly Correlated Electrons · Physics 2021-05-14 Tae Gwan Park , Byoung Ki Choi , Junho Park , Jungdae Kim , Young Jun Chang , Fabian Rotermund

Recent development of ultrashort laser pulses allows for optical control of structural and electronic properties of complex quantum materials. The layered transition metal dichalcogenide MoTe2, which can crystalize into several different…

Materials Science · Physics 2019-05-29 M. Y. Zhang , Z. X. Wang , Y. N. Li , L. Y. Shi , D. Wu , T. Lin , S. J. Zhang , Y. Q. Liu , C. N. Wang , Q. M. Liu , J. Wang , T. Dong , N. L. Wang

Transition metal dichalcogenides (TMDCs) have demonstrated significant potential as versatile quantum materials for light absorption and emission. Their unique properties are primarily governed by exciton-photon interactions, which can be…

Ultrafast optical switching of materials properties is of great relevance both for future technological applications as well as gaining fundamental physical insights to microscopic couplings and nonequilibrium phenomena. Transition-metal…

Materials Science · Physics 2024-10-04 Till Domröse , Claus Ropers

Two-dimensional transition metal dichalcogenide (2D-TMD) monolayers, which reveal remarkable semiconductor properties, are the subject of active experimental research.Recently it has been shown experimentally that quantum yield in MoS2 and…

Materials Science · Physics 2020-01-29 Maksym V. Strikha , Anatolii I. Kurchak , Anna N. Morozovska

Recent progress in the synthesis of highly stable, eco-friendly, cost-effective transition metal-dichalcogenides (TMDC) quantum dots (QDs) with their broadband absorption spectrum and wavelength selectivity features have led to their…

Transition metal dichalcogenides (TMDs) are optically active layered materials providing potential for fast optoelectronics and on-chip photonics. We demonstrate electrically driven single-photon emission from localised sites in tungsten…

Two-dimensional (2D) layered transition metal dichalcogenides (TMDs) have emerged as promising materials for electronic, optoelectronic, and valleytronic applications. Recent work suggests drastic changes of the band gap and exciton binding…

Mesoscale and Nanoscale Physics · Physics 2017-08-02 Eric Parzinger , Martin Hetzl , Ursula Wurstbauer , Alexander W. Holleitner

Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) are good candidates for high-performance flexible electronics. However, most demonstrations of such flexible field-effect transistors (FETs) to date have been on…

Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) can withstand a large deformation without fracture or inelastic relaxation, making them attractive for application in novel strain-engineered and flexible…

Materials Science · Physics 2016-01-18 Junwen Li , Nikhil V. Medhekar , Vivek B. Shenoy

Recent developments in high-power ultrafast optical technology and emerging theoretical frameworks in strong-field quantum electrodynamics (SF-QED) are unveiling nuanced differentiations between the semi-classical and full quantum…