Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Wolfgang Hansen"'
Publikováno v:
APL Materials, Vol 12, Iss 5, Pp 051107-051107-8 (2024)
The crossover from quasi-two- to quasi-one-dimensional electron transport subject to transverse electric fields and perpendicular magnetic fields is studied in the diffusive to quasi-ballistic and zero-field to quantum Hall regime. In-plane gates and
Externí odkaz:
https://doaj.org/article/e720155b5b3a49a699d28a0997c4c9a0
Autor:
Jan-Niklas Toedt, Wolfgang Hansen
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
Abstract In this work we present a method to dynamically control the propagation of spin-wave packets. By altering an external magnetic field the refraction of the spin wave at a temporal inhomogeneity is enabled. Since the inhomogeneity is spatially
Externí odkaz:
https://doaj.org/article/327ff18e5b3f4636b4ca3a272784e052
Autor:
Christian Heyn, Leonardo Ranasinghe, Kristian Deneke, Ahmed Alshaikh, Carlos A. Duque, Wolfgang Hansen
Publikováno v:
Nanomaterials, Vol 13, Iss 5, p 857 (2023)
Strain-free GaAs cone–shell quantum structures (CSQS) with widely tunable wave functions (WF) are fabricated using local droplet etching (LDE) during molecular beam epitaxy (MBE). During MBE, Al droplets are deposited on an AlGaAs surface, which th
Externí odkaz:
https://doaj.org/article/d564565fdb704965a824353751722cfa
Autor:
Christian Heyn, Andreas Gräfenstein, Geoffrey Pirard, Leonardo Ranasinghe, Kristian Deneke, Ahmed Alshaikh, Gabriel Bester, Wolfgang Hansen
Publikováno v:
Nanomaterials, Vol 12, Iss 17, p 2981 (2022)
Strain-free GaAs quantum dots (QDs) are fabricated by filling droplet-etched nanoholes in AlGaAs. Using a template of nominally identical nanoholes, the QD size is precisely controlled by the thickness of the GaAs filling layer. Atomic force microsco
Externí odkaz:
https://doaj.org/article/daf774655ae54f9c9585aaec50d6e365
Autor:
Leonardo Ranasinghe, Christian Heyn, Kristian Deneke, Michael Zocher, Roman Korneev, Wolfgang Hansen
Publikováno v:
Nanomaterials, Vol 11, Iss 3, p 690 (2021)
Epitaxially grown quantum dots (QDs) are established as quantum emitters for quantum information technology, but their operation under ambient conditions remains a challenge. Therefore, we study photoluminescence (PL) emission at and close to room te
Externí odkaz:
https://doaj.org/article/9cc924d18014468fa21ceea57d0a42a3
Autor:
Christian Heyn, Roman Korneev, Michael Zocher, Wolfgang Hansen, Kristian Deneke, Leonardo Ranasinghe
Publikováno v:
Nanomaterials
Nanomaterials, Vol 11, Iss 690, p 690 (2021)
Volume 11
Issue 3
Nanomaterials, Vol 11, Iss 690, p 690 (2021)
Volume 11
Issue 3
Epitaxially grown quantum dots (QDs) are established as quantum emitters for quantum information technology, but their operation under ambient conditions remains a challenge. Therefore, we study photoluminescence (PL) emission at and close to room te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::957d1e0797e096e833be11c7dece0544
Publikováno v:
Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XV.
We give an overview on the present status of self-assembled quantum structure fabrication by using the local droplet etching (LDE) technique during semiconductor molecular-beam epitaxy (MBE). LDE functionalizes nanodroplets to drill spatially well se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cec937f65811f3997b4813fbe30dbbee
https://doi.org/10.1117/12.2295829
https://doi.org/10.1117/12.2295829
Publikováno v:
Physics of Quantum Rings ISBN: 9783319951584
We give an overview on various types of strain-free semiconductor quantum ring (QR) structures created in a self-assembled fashion with the local droplet etching (LDE) method. LDE is fully compatible with conventional molecular beam epitaxy (MBE) and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ee8f30c8af311fc88d3af29097ed203
https://doi.org/10.1007/978-3-319-95159-1_6
https://doi.org/10.1007/978-3-319-95159-1_6
Autor:
Tobias U. Schülli, Thomas F. Keller, Taras Slobodskyy, Christian Heyn, S. Fernandez, Marie-Ingrid Richard, Wolfgang Hansen, Vedran Vonk, Andreas Stierle
Publikováno v:
Physical Review Materials
Physical review materials 2(10), 106001 (2018). doi:10.1103/PhysRevMaterials.2.106001
Physical review materials 2(10), 106001 (2018). doi:10.1103/PhysRevMaterials.2.106001
Physical review materials 2(10), 106001 (2018). doi:10.1103/PhysRevMaterials.2.106001
Nanoholes, drilled in the (001) surface of AlGaAs by local Al droplet etching, are shown to consist of faceted inner walls. The most prominent facets of the in
Nanoholes, drilled in the (001) surface of AlGaAs by local Al droplet etching, are shown to consist of faceted inner walls. The most prominent facets of the in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca4e1e7ba3c4fa835e29e992dbb5aeb3
Autor:
Robert H. Blick, Wolfgang Hansen, Aune Koitmäe, Cornelius S. Bausch, Jann Harberts, Manuel Müller, Gabriele Loers
Publikováno v:
Langmuir : the ACS journal of surfaces and colloids. 34(4)
Here we present a designer’s approach to building cellular neuronal networks based on a biocompatible negative photoresist with embedded coaxial feedthroughs made of semiconductor microtubes. The diameter of the microtubes is tailored and adjusted
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe395f4331c61058cd607af1a192f45b
https://pubmed.ncbi.nlm.nih.gov/29261324
https://pubmed.ncbi.nlm.nih.gov/29261324