WorldCat Identities

Helm, Manfred

Overview
Works: 55 works in 96 publications in 2 languages and 436 library holdings
Genres: Academic theses 
Roles: dgs, Other, Contributor
Classifications: TA1570, 530
Publication Timeline
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Most widely held works by Manfred Helm
Long wavelength infrared emitters based on quantum wells and superlattices( Book )

6 editions published between 1999 and 2000 in English and held by 102 WorldCat member libraries worldwide

"This book intends to give a state-of-the-art survey on long wavelength infrared semiconductor emitters, mainly based on quantum wells and superlattices Featuring contributions from the most prominent researchers in the field, this volume allows the reader to compare different types of mind-infrared lasers, as well as examine investigations on potential far-infrared/THz sources. This is an essential reference for researchers, engineers and graduate students who wish to obtain comprehensive knowledge about infrared semiconductor source and the most recent developments in this field."--Jacket
Scanning near-field infrared microspectroscopy on semiconductor structures by Rainer Jacob( )

1 edition published in 2011 in English and held by 19 WorldCat member libraries worldwide

Integration of III-V compound nanocrystals in silicon via ion beam implantation and flash lamp annealing by René Wutzler( )

2 editions published in 2017 in English and held by 19 WorldCat member libraries worldwide

The interplay between localization and magnetism in III-Mn-V dilute ferromagnetic semiconductors by Ye Yuan( )

3 editions published between 2017 and 2018 in English and held by 19 WorldCat member libraries worldwide

Terahertz quantum-cascade lasers for spectroscopic applications by Benjamin Malte Röben( )

1 edition published in 2018 in English and held by 18 WorldCat member libraries worldwide

Relaxation dynamics in photoexcited semiconductor quantum wells studied by time-resolved photoluminescence by Sabine Zybell( )

1 edition published in 2015 in English and held by 18 WorldCat member libraries worldwide

Supraleitung in Gallium-implantiertem Silizium by Richard Skrotzki( )

1 edition published in 2016 in German and held by 18 WorldCat member libraries worldwide

Das Diffusions- und Aktivierungsverhalten von Arsen und Phosphor in Germanium by Clemens Wündisch( )

1 edition published in 2016 in German and held by 17 WorldCat member libraries worldwide

Self organized formation of Ge nanocrystals in multilayers by Manuel Zschintzsch-Dias( )

1 edition published in 2012 in English and held by 17 WorldCat member libraries worldwide

Elektrische und strukturelle Eigenschaften von supraleitenden Schichten in Gallium-implantiertem Silizium und Germanium by Jan Fiedler( )

1 edition published in 2013 in German and held by 17 WorldCat member libraries worldwide

Zielstellung der Dissertation ist die detaillierte Analyse der Auswirkungen von supraleitenden Galliumausscheidungen auf das elektrische Transportverhalten hochdotierter Silizium- und Germaniumschichten. Dafür wird ein neues Verfahren zur Herstellung von supraleitenden Schichten in kommerziellen Silizium- und Germanium-Wafern mit Hilfe von Ionenimplantation und Kurzzeitausheilung entwickelt. Mittels Ionenimplantation durch eine dünne dielektrische Deckschicht wurden Galliumkonzentrationen weit über der Gleichgewichtslöslichkeit in die Silizium- und Germaniumsubstrate eingebracht. Kurzzeitausheilverfahren wurden verwendet, um die die Umverteilung des Galliums anzuregen. Die resultierende Galliumverteilung wurde analysiert und es konnte ein Modell entwickelt werden, welches die Ursache für die Ausbildung einer 10 nm dünnen Gallium-reichen Schichten an der Deckschicht/Halbleiter-Grenzfläche beschreibt. Übersteigt die Galliumkonzentration an der Grenzfläche den kritischen Wert von 15 at.%, können die Schichten bei Temperaturen unterhalb von 6 - 7 K supraleitend werden und zeigen damit eine ähnlich kritische Temperatur wie bereits untersuchte dünne amorphe Galliumfilme. Es wird somit erstmalig gezeigt, dass Gallium-reiche Ausscheidungen eine mit reinem Gallium vergleichbare kritische Temperatur haben. Der bisher häufig als Funktion der Schichtdicke erforschte Supraleiter-Isolator-Übergang konnte in den Schichten durch die Variation der Ausheilzeit hervorgerufen werden. Der normalleitende Schichtwiderstand ist als entscheidender Parameter für den Phasenübergang anzusehen. Da sich Gallium-reiche Ausscheidungen in Germanium wegen der geringen Differenz in Masse und Elektronenstruktur nur schwer nachweisen lassen, erfolgten die Strukturuntersuchungen hauptsächlich an Siliziumschichten. Die Ergebnisse dieses Modellsystems lassen sich zum großen Teil auf das Verhalten von Gallium in Germanium übertragen. Dieser Vergleich zeigt, dass außer der kritischen Temperatur alle elektrischen Eigenschaften der Gallium-reichen Schichten vom Substratmaterial abhängen. Supraleitung in Gallium-dotiertem Germanium wurde bisher nur bei Temperaturen unterhalb von 1 K beobachtet. Deshalb ist die kritische Temperatur ein geeigneter Parameter, um durch Dotierung hervorgerufene Supraleitung in Germanium von supraleitenden Ausscheidungen zu unterscheiden
Non-linear THz spectroscopy in semiconductor quantum structures by Martin Teich( )

1 edition published in 2014 in English and held by 17 WorldCat member libraries worldwide

Highly Mismatched GaAs(1-x)N(x) and Ge(1-x)Sn(x) Alloys Prepared by Ion Implantation and Ultrashort Annealing by Kun Gao( )

2 editions published between 2014 and 2015 in English and held by 17 WorldCat member libraries worldwide

Carrier Relaxation Dynamics in Graphene by Martin Mittendorff( )

2 editions published between 2014 and 2015 in English and held by 17 WorldCat member libraries worldwide

Infrared nanospectroscopy at cryogenic temperatures and on semiconductor nanowires by Denny Lang( )

1 edition published in 2019 in English and held by 4 WorldCat member libraries worldwide

Proceedings of the Fifth International Conference on Intersubband Transitions in Quantum Wells : held in Bad Ischl, Austria, 7-11 September 1999 by ITQW( Book )

1 edition published in 2000 in English and held by 4 WorldCat member libraries worldwide

Coherent Multidimensional Off-resonant THz Spectroscopy on Semiconductors by Carmine Somma( )

1 edition published in 2017 in English and held by 4 WorldCat member libraries worldwide

Novel Methods for Controlled Self-Catalyzed Growth of GaAs Nanowires and GaAs/AlxGa1-xAs Axial Nanowire Heterostructures on Si Substrates by Molecular Beam Epitaxy by Tina Tauchnitz( )

2 editions published between 2019 and 2020 in English and held by 4 WorldCat member libraries worldwide

THz pump-probe spectroscopy of the intersubband AC-Stark effect in a GaAs quantum well by Johannes Schmidt( )

2 editions published between 2019 and 2020 in English and held by 3 WorldCat member libraries worldwide

Hyperdoping Si with deep-level impurities by ion implantation and sub-second annealing by Fang Liu( )

1 edition published in 2018 in English and held by 3 WorldCat member libraries worldwide

Pump-probe spectroscopy of interminiband relaxation and electron cooling in doped superlattices( )

2 editions published between 2006 and 2007 in English and held by 3 WorldCat member libraries worldwide

 
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Audience level: 0.84 (from 0.65 for Pump-probe ... to 0.95 for Long wavel ...)

WorldCat IdentitiesRelated Identities
Long wavelength infrared emitters based on quantum wells and superlattices
Covers
Alternative Names
Manfred Helm austerriksk fysikar

Manfred Helm Austrian physicist

Manfred Helm físic austríac

Manfred Helm fisiceoir Ostarach

Manfred Helm físico austríaco

Manfred Helm fizikan austriak

Manfred Helm natuurkundige uit Oostenrijk

Manfred Helm österreichischer Physiker

Manfred Helm österrikisk fysiker

Manfred Helm østerriksk fysiker

Manfred Helm østrigsk fysiker

Languages
English (30)

German (3)