Bulletin of the American Physical Society
2006 APS March Meeting
Monday–Friday, March 13–17, 2006; Baltimore, MD
Session U3: Nanomechanical Architecture of Strained Thin Films |
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Sponsoring Units: DCMP Chair: Max Lagally, University of Wisconsin-Madison Room: Baltimore Convention Center Ballroom I |
Thursday, March 16, 2006 8:00AM - 8:36AM |
U3.00001: Precise semiconductor nanotubes and nanocorrugated quantum systems: concept, fabrication and properties Invited Speaker: Physics and technology of several new classes of nanostructures, namely, variously shaped semiconductor, metal, dielectric and hybrid nanoshells, are overviewed. Previously, we discoved that ultrathin epitaxial heterofilms (down to two monolayers in thickness in the case of InGaAs/GaAs) can be controllably released from substrates and rolled up under the action of internal stresses into various cylindrical micro- and nanotubes, scrolls, rings, helices, etc. [1]. In this way, nanotubes with minimum diameter of 2-nm can be obtained. The fabricated nanoshells offer much promise as building blocks for nanoelectronic and nanomechanic devices, their fabrication technology being fully compatible with the well-established integrated-circuit technology [2]. Experimental and theoretical results concerning the quantum processes in the fabricated micro - and nanoshells are reported, including ballistic and tunnel transport in bent waveguides, magnetotransport, bending-induced formation of deep quantum wells and quantum dots molecules [3]. New results on the formation of spatially periodic nanostructures, nanocorrugated systems, shells with 1-nm minimum radius of curvature, building blocks for nanodevices and new nanocomposite materials are described. The present report outlines the cornerstone stages in the development of this fabrication technology for semiconductor and metal nanoobjects, including: directional rolling of films, super-critical drying of nanoshells, passivation of electron states in them, etc. Benefits offered by the new approach in the creation of 3D ordered nanoobject arrays, as well as challenges met in the development of the original nano- and molecular technology are discussed. \begin{enumerate} \item V.Ya. Prinz et al., Physica E 6, 828 (2000). \item V.Ya. Prinz, Physica E 23 260; 24, 54 (2004). \item V. M. Osadchii and V. Ya. Prinz, Phys. Rev. B 72, 033313 (2005). \end{enumerate} [Preview Abstract] |
Thursday, March 16, 2006 8:36AM - 9:12AM |
U3.00002: Nanomechanical Architecture of Strained Bi-layer Thin Films: From Design Principles to Fabrication Invited Speaker: Controlled and consistent fabrication of different classes and shapes of nanostructures (as opposed to simply stochastic self-assembly) will be a requirement if nanotechnology expects to achieve its promised impact on society. We illustrate by both theory and computation the design principles of an emerging nanofabrication approach based on the \textit{nanomechanical architecture} of strained bi-layer thin films, which are further confirmed by experiments through fabrication of a variety of nanostructures, including nanotubes, nanorings, nanodrills, and nanocoils. This approach demonstrates the possibility of fabricating nanostructures with an unprecedented level of control over their size, geometry, and uniformity, based on \textit{a priori} designs. It possesses also an unparallel level of versatility for making nanostructures with combinations of different materials. By combined multi-scale modeling and simulations from first-principles calculation, to molecular dynamics simulation, and to continuum mechanics modeling, we demonstrate how mechanical bending of nanoscale thin films differs from that of macroscopic thin films. For example, we show that surface stress will even play a more dominant role than misfit strain in bending a film that is down a few monolayers thick. *This work is supported by DOE and NSF. [Preview Abstract] |
Thursday, March 16, 2006 9:12AM - 9:48AM |
U3.00003: Nonochannel networks, light emission and waveguidung of micro- and nanotubes, and ultra-compact coils Invited Speaker: Quite generally, thin solid films can be partially released from a substrate surface by selective underetching and form into various 3D micro- and nano-objects [1-3]. Here, we show that such released layers form into complex nanochannel networks, which can be fluid-filled and emptied within fractions of a second. Furthermore, we demonstrate that single material layers roll-up into micro- and nanotubes. In particular, we show that all-Si tubes can be fabricated. Quantum emitters such as InAs/GaAs quantum dot heterostructures are integrated into the wall of rolled-up microtubes, and we study the emission and the waveguiding properties of such ``quantum dots in a tube'' [4]. Finally, metal/semiconductor bilayers are rolled up into microtubes. This technique opens the way to realize and integrate ultra-compact coils, transformers and capacitors on a single chip [5]. I am grateful to my collaborators Y. Mei, R. Songmuang, C. Mendach, C. Deneke, D. Thurmer, F. Cavallo, and A. Rastelli (all Max-Planck-Institut fuer Festkoerperforschung Stuttgart, Germany) \newline \newline [1] O. G. Schmidt and K. Eberl, Nature 410, 168 (2001) \newline [2] O. G. Schmidt et al., Advanced Materials 13, 756 (2001) \newline [3] V. Ya. Prinz et al., Physica E 6, 828 (2000) \newline [4] S. Mendach et al., Appl. Phys. Lett. (submitted) \newline [5] O. G. Schmidt et al., IEEE J. Selected Topics Quantum Electronics 8, 1025 (2002) [Preview Abstract] |
Thursday, March 16, 2006 9:48AM - 10:24AM |
U3.00004: Fabrication and Applications of Tubular Semiconductor Membranes Invited Speaker: We present transport measurements on curved semiconductor membranes. The aim is to investigate geometric potentials in low dimensional electron systems. We have conducted first studies on topography dependant electron transport in complete tubes, using built in strain between lattice mismatched semiconductors. We will discuss the processing details in SiGe and InGaAs strained layers. Initial studies reveal two regimes of electron transport which are probed by a varying perpendicular magnetic field. At low magnetic field, we see an increase in electron scattering along curved regions due to an increase in electron scattering. At high magnetic field, we find a linear increase in resistance of the curved region as compared to planar regions. Finally, we will give an outlook into possible applications in nano-electromechanical systems. [Preview Abstract] |
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