- document
-
Smit, G.D.J. (author), Rogge, S. (author), Klapwijk, T.M. (author)We have measured electrical transport across epitaxial, nanometer-sized metal–semiconductor interfaces by contacting CoSi2 islands grown on Si(111) with the tip of a scanning tunneling microscope. The conductance per unit area was found to increase with decreasing diode area. Indeed, the zero-bias conductance was found to be ? 104 times larger...journal article 2002
- document
-
Shastin, V.N. (author), Zhukavin, R.K. (author), Orlova, E.E. (author), Pavlov, S.G. (author), Rümmeli, M.H. (author), Hübers, H.W. (author), Hovenier, J.N. (author), Klaassen, T.O. (author), Riemann, H. (author), Bradley, I.V. (author), Van der Meer, A.F.G. (author)Frequency-tunable radiation from the free electron laser FELIX was used to excite neutral phosphorus and bismuth donors embedded in bulk monocrystalline silicon. Lasing at terahertz frequencies has been observed at liquid helium temperature while resonant pumping of odd parity impurity states. The threshold was about two orders of magnitude...journal article 2002
- document
-
Mans, A. (author)Epitaxial films that are only several atoms layers thick exhibit interesting properties associated with quantum confinement. The electrons form standing waves, just like a violin string, clamped at both ends. In ultrathin lead films, this so-called `quantum size effect' (QSE) alters the physical properties of the film (such as the resistivity,...doctoral thesis 2005
- document
-
Kessels, M.J.H. (author), Bijkerk, F. (author), Tichelaar, F.D. (author), Verhoeven, J. (author)We developed and demonstrate an analysis method in which we calibrate the intensity scale of cross-sectional transmission electron microscopy (TEM) using Cu K? reflectometry. This results in quantitative in-depth density profiles of multilayer structures. Only three free parameters are needed to obtain the calibrated profiles, corresponding to...journal article 2005
- document
- Fischer, A.C. (author), Steinebach, O.M. (author), Timmermans, K.R. (author), Wolterbeek, H.T. (author) journal article 2007
- document
-
Sellier, H. (author), Lansbergen, G.P. (author), Caro, J. (author), Rogge, S. (author), Collaert, N. (author), Ferain, I. (author), Jurczak, M. (author), Biesemans, S. (author)The authors investigate the subthreshold behavior of triple-gate silicon field-effect transistors by low-temperature transport experiments. These three-dimensional nanoscale devices consist of a lithographically defined silicon nanowire surrounded by a gate with an active region as small as a few tens of nanometers down to 50×60×35?nm3....journal article 2007
- document
-
Lazic, I. (author), Ikonic, Z. (author), Milanovic, V. (author), Kelsall, R.W. (author), Indjin, D. (author), Harrison, P. (author)An electron transport model in n-Si/SiGe quantum cascade or superlattice structures is described. The model uses the electronic structure calculated within the effective-mass complex-energy framework, separately for perpendicular (Xz) and in-plane (Xxy) valleys, the degeneracy of which is lifted by strain, and additionally by size quantization....journal article 2007
- document
-
Zhukavin, R.K. (author), Shastin, V.N. (author), Pavlov, S.G. (author), Hübers, H.W. (author), Hovenier, J.N. (author), Klaassen, T.O. (author), Van der Meer, A.F.G. (author)Small signal gain measurements of optically excited terahertz silicon lasers are reported. Two types of lasers, Si:P and Si:Bi, were investigated. They were optically excited with radiation from a free electron laser or a CO2 laser. The experiments were performed with an oscillator-amplifier scheme where one sample serves as a laser while the...journal article 2007
- document
- Kalmanovitz, N.R. (author), Hoxha, I. (author), Jin, Y. (author), Vitkalov, S.A. (author), Sarachik, M.P. (author), Larkin, I.A. (author), Klapwijk, T.M. (author) journal article 2008
- document
-
Pavlov, S.G. (author), Hübers, H.W. (author), Böttger, U. (author), Zhukavin, R.K. (author), Shastin, V.N. (author), Hovenier, J.N. (author), Redlich, B. (author), Abrosimov, N.V. (author), Riemann, H. (author)Raman-type stimulated emission at frequencies between 5.0 and 5.2?THz as well as between 6.1 and 6.4?THz has been realized in silicon crystals doped by phosphorus donors. The Raman laser operates at around 5?K under optical excitation by a pulsed, frequency-tunable infrared free electron laser. The frequencies of the observed laser emission are...journal article 2008
- document
-
Brasser, H.J. (author), Krijger, G.C. (author), Wolterbeek, H.T. (author)Silicon is involved in numerous important structural and functional roles in a wide range of organisms, including diatoms, plants, and humans, but clear mechanisms have been discovered only in diatoms and sponges. Silicate availability influences metal concentrations within various cell- and tissue-types, but a mechanism has not been discovered...journal article 2008
- document
-
Zwanenburg, F.A. (author)The research in this thesis is motivated by an interest in quantum physics and by the prospect of new applications based on the spin of electrons or holes. This work focuses on confining single spins in quantum dots, which can serve as building blocks of a future quantum computer. Such a computer exploits the unique features of quantum mechanics...doctoral thesis 2008
- document
-
Weis, C.D. (author), Schuh, A. (author), Batra, A. (author), Persaud, A. (author), Rangelow, I.W. (author), Bokor, J. (author), Lo, C.C. (author), Cabrini, S. (author), Sideras-Haddad, E. (author), Fuchs, G.D. (author), Hanson, R. (author), Awschalom, D.D. (author), Schenkel, T. (author)The ability to inject dopant atoms with high spatial resolution, flexibility in dopant species, and high single ion detection fidelity opens opportunities for the study of dopant fluctuation effects and the development of devices in which function is based on the manipulation of quantum states in single atoms, such as proposed quantum computers....journal article 2008
- document
-
Pavlov, S.G. (author), Böttger, U. (author), Hovenier, J.N. (author), Abrosimov, N.V. (author), Riemann, H. (author), Zhukavin, R.K. (author), Shastin, V.N. (author), Redlich, B. (author), Van der Meer, A.F.G. (author), Hübers, H.W. (author)Stimulated Raman emission in the terahertz frequency range (4.8–5.1 THz and 5.9–6.5 THz) has been realized by optical excitation of arsenic donor centers in silicon at low temperatures. The Stokes shift of the observed laser emission is 5.42 THz which is equal to the Raman-active donor electronic transition between the ground 1s(A1) and the...journal article 2009
- document
-
Chen, P. (author), Salemink, H.W.M. (author), Alkemade, P.F.A. (author)Ion-beam-induced deposition (IBID) is a powerful technique for prototyping three-dimensional nanostructures. To study its capability for this purpose, the authors investigate the proximity effect in IBID of nanopillars. In particular, the changes in shape and dimension of pillars are studied when a second pillar is grown near an existing pillar....journal article 2009
- document
-
Zwanenburg, F.A. (author), Van Loon, A.A. (author), Steele, G.A. (author), Rijmenam, C.E.W.M. (author), Balder, T. (author), Fang, Y. (author), Lieber, C.M. (author), Kouwenhoven, L.P. (author)We report the realization of extremely small single quantum dots in p-type silicon nanowires, defined by Schottky tunnel barriers with Ni and NiSi contacts. Despite their ultrasmall size the NiSi–Si–NiSi nanowire quantum dots readily allow spectroscopy of at least ten consecutive holes, and additionally they display a pronounced excited-state...journal article 2009
- document
-
Brasser, H.J. (author)Silicon (Si) is omnipresent in nature, and it is involved in important but diverse roles in a broad range of organisms, including diatoms, higher plants and humans. Some organisms, like the diatoms, need high amounts of silicon, and master silicon chemistry to a high extend using several enzymes. Other organisms which need silicon as an...doctoral thesis 2009
- document
-
Verduijn, J. (author), Tettamanzi, G.C. (author), Lansbergen, G.P. (author), Collaert, N. (author), Biesemans, S. (author), Rogge, S. (author)In this letter, we describe the observation of the interference of conduction paths induced by two donors in a nanoscale silicon transistor, resulting in a Fano resonance. This demonstrates the coherent exchange of electrons between two donors. In addition, the phase difference between the two conduction paths can be tuned by means of a magnetic...journal article 2010
- document
-
Lansbergen, G.P. (author)-doctoral thesis 2010
- document
-
Johnson, B.C. (author), Tettamanzi, G.C. (author), Alves, A.D.C. (author), Thompson, S. (author), Yang, C. (author), Verduijn, J. (author), Mol, J.A. (author), Wacquez, R. (author), Vinet, M. (author), Sanquer, M. (author), Rogge, S. (author), Jamieson, D.N. (author)We demonstrate single dopant implantation into the channel of a silicon nanoscale metal-oxide-semiconductor field-effect-transistor. This is achieved by monitoring the drain current modulation during ion irradiation. Deterministic doping is crucial for overcoming dopant number variability in present nanoscale devices and for exploiting single...journal article 2010