Výsledky vyhledávání - "Gérald Bastard"

Topological band structure in InAs/GaSb/InAs triple quantum wells

Autor: S. Schmid, Fabian Hartmann, Gérald Bastard, Fauzia Jabeen, Manuel Meyer, Sven Höfling

Publikováno v: Physical Review B. 104

We present gate voltage and temperature dependent transport measurements of InAs/GaSb/InAs triple quantum wells (TQWs) with a designed hybridization gap energy of 4 meV comparable to its traditional double quantum well counterpart. Gate voltage depen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d176aeb2ae99ac5583c30f9bbe6c3c06
https://doi.org/10.1103/physrevb.104.085301

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Phonon-assisted exciton and trion conversion efficiency in transition metal Dichalcogenides

Autor: Gérald Bastard, Sihem Jaziri, Sabrine Ayari, Robson Ferreira

Photoluminescence spectra, shows that monolayer Transition-metal dichalcogenides (MLTMDCs), possess charged exciton binding energies, conspicuously similar to the energy of optical phonons. This enigmatic coincidence has offered opportunities to inve

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Laser Level Selection in Terahertz Quantum Cascade Lasers

Autor: Maximilian Beiser, Hermann Detz, Aaron Maxwell Andrews, Karl Unterrainer, Sebastian Schönhuber, Martin A. Kainz, Gottfried Strasser, M. Giparakis, Werner Schrenk, Benedikt Limbacher, Gérald Bastard

Publikováno v: 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID).

The active region of a terahertz quantum cascade laser with two optical transitions is studied. The population of upper laser states, which correspond to 3.4 and 3.8 THz, are investigated at different operating temperatures and in a strong magnetic f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::26b9bf76c2df3a1eaf2e0bf9079249fc
https://doi.org/10.1109/rapid.2019.8864249

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Optical tuning of the charge carrier type in the topological regime of InAs/GaSb quantum wells

Autor: L. Worschech, S. Schmid, Fabian Hartmann, Martin Kamp, Sven Höfling, P. Pfeffer, Gérald Bastard, E. Batke, Georg Knebl

The work was supported by the DFG (project Ka2318/5-1) and the Elite Network of Bavaria within the graduate program “Topological Insulators”. We study the optical tunability of the charge carrier type in InAs/GaSb double quantum wells with its ty

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::662953d2bb655a9437c6cf66d111bf21
https://hdl.handle.net/10023/15511

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Tunable Dirac interface states in topological superlattices

Autor: G. Springholz, T. Phuphachong, Yves Guldner, Badih A. Assaf, L. A. de Vaulchier, G. Bauer, Gérald Bastard, G. Krizman, Robson Ferreira

Relativistic Dirac fermions are ubiquitous in condensed matter physics. Their mass is proportional to the material energy gap and the ability to control and tune the mass has become an essential tool to engineer quantum phenomena that mimic high ener

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Avoided level crossing at the magnetic field induced topological phase transition due to spin-orbital mixing

Autor: L. A. de Vaulchier, G. Bauer, Robson Ferreira, G. Springholz, Yves Guldner, Badih A. Assaf, Milan Orlita, G. Krizman, Thanyanan Phuphachong, Gérald Bastard

Publikováno v: Physical Review B: Condensed Matter and Materials Physics (1998-2015)
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 98 (16)
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2018, 98 (16), ⟨10.1103/PhysRevB.98.161202⟩
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In 3D topological insulators, an effective closure of the bulk energy gap with increasing magnetic field expected at a critical point can yield a band crossing at a gapless Dirac node. Using high-field magnetooptical Landau level spectroscopy on the

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