13,859 Hits in 3.8 sec

Transmission phase read-out of a large quantum dot in a nanowire interferometer [article]

Francesco Borsoi, Kun Zuo, Sasa Gazibegovic, Roy L. M. Op het Veld, Erik P. A. M. Bakkers, Leo P. Kouwenhoven, Sebastian Heedt
2020 arXiv   pre-print
In our two-path interferometer, we define a quantum dot in one branch and use the other path as a reference arm.  ...  Detecting the transmission phase of a quantum dot via interferometry can reveal the symmetry of the orbitals and details of electron transport.  ...  of a quantum dot defined in a nanowire.  ... 
arXiv:2006.14645v1 fatcat:tf2fajmnm5cinnfnag6vyqfjue

Fully Abstract Models of the Probabilistic lambda-calculus

Pierre Clairambault, Hugo Paquet, Michael Wagner
2018 Annual Conference for Computer Science Logic  
Using Leventis' theorem (probabilistic Böhm trees characterise observational equivalence), we derive a full abstraction result for the games model.  ...  Probabilistic Böhm trees and probabilistic strategies are shown to be related by a precise correspondence theorem, in the spirit of existing work for the pure λ-calculus.  ...  In particular the author defines a notion of probabilistic Böhm tree, and redevelops the Böhm theory of the λ-calculus in a probabilistic setting.  ... 
doi:10.4230/lipics.csl.2018.16 dblp:conf/csl/ClairambaultP18 fatcat:23jtwzvvgvd35baxkm2vcklazm

Aharonov-Bohm phase shift in an open electron resonator

D. S. Duncan, M. A. Topinka, R. M. Westervelt, K. D. Maranowski, A. C. Gossard
2001 Physical Review B (Condensed Matter)  
The application of a perpendicular magnetic field causes a shift in the peak positions, which is explained by the combined effects of electron trajectory bending and the Aharanov-Bohm phase shift.  ...  At higher temperatures, thermal smearing washes out the fine structure and only the primary peaks are resolvable.  ...  To explain our data, we must introduce the Aharonov-Bohm contribution to the phase in our calculation.  ... 
doi:10.1103/physrevb.64.033310 fatcat:tvygp74vubcs5lohg2m5w6mz3a

Strong Aharonov-Bohm oscillations in GaAs two-dimensional holes

B. Habib, E. Tutuc, M. Shayegan
2007 Applied Physics Letters  
We measured Aharonov-Bohm resistance oscillations in a shallow two-dimensional GaAs hole ring structure, defined by local anodic surface oxidation.  ...  The Aharonov-Bohm (AB) effect and related phenomenon in mesoscopic semiconductor structures have attracted much attention over the last years.  ...  We fabricated the ring structure via the LAO technique using an AFM.  ... 
doi:10.1063/1.2720711 fatcat:yphkusxwgrfj7n3nmhnxwvb2my

Investigations of the role of nonlinear couplings in structure formation and transport regulation: experiment, simulation, and theory

C Holland, P.H Diamond, S Champeaux, E Kim, O Gurcan, M.N Rosenbluth, G.R Tynan, N Crocker, W Nevins, J Candy
2003 Nuclear Fusion  
Understanding the physics of shear flow and structure formation in plasmas is a central problem for *  ...  Bohm or gyro-Bohm).  ...  The size of the i th pulse is defined as for h >> h c .  ... 
doi:10.1088/0029-5515/43/8/319 fatcat:w5wfbask3ngbhl2xvfcbwesqhi

Shock Physics in Warm Dense Matter–a quantum hydrodynamics perspective [article]

F. Graziani, Z. Moldabekov, B. Olson, M. Bonitz
2021 arXiv   pre-print
From the numerical hydrodynamic simulations we observe that the quantum Bohm pressure induces shear force which weakens the formation and strength of the shock.  ...  Our theoretical and numerical analysis allows us to identify characteristic dimensionless shock propagation parameters at which the effect of the Bohm force is important.  ...  is the fine structure constant.  ... 
arXiv:2109.09081v2 fatcat:icjen3c6snbrzdnuksw5djc34y

Interference in a quantum dot molecule embedded in a ring interferometer

Thomas Ihn, Martin Sigrist, Klaus Ensslin, Werner Wegscheider, Matthias Reinwald
2007 New Journal of Physics  
They define the ring structure connected to source and drain contacts as indicated in the figure.  ...  Excellent stability and full tunability of this structure fabricated with twolayer SFM-lithography turned out to be a key prerequisite for the success of the measurements.  ... 
doi:10.1088/1367-2630/9/5/111 fatcat:k5y74ed3m5evppl2ppgszwusbq

Bohm's Mysterious 'Quantum Force' and 'Active Information': Alternative Interpretation and Statistical Properties

Boon Leong Lan
2001 Zeitschrift fur Naturforschung A-A Journal of Physical Sciences  
force with out a source nor a mysterious active information that somehow guides a particle.  ...  25001 data values, and fitted stable den sity (dotted line).  ... 
doi:10.1515/zna-2001-0136 fatcat:dhkencrmvveppk3vad42ltiedq

On the Recursive Enumerability of Fixed-Point Combinators

Mayer Goldberg
2004 BRICS Report Series  
They used to define recursive functions and circular data structures by replacing recursion and circularity with self-application.  ...  For any j > 0 we define: C j ≡ C(j) Q j ≡ C j ,{C j }, j We use this structure to maintain all the terms that can be reached from C j via any finite number of βη-steps, so as we move from V j to V j+1  ... 
doi:10.7146/brics.v11i25.21850 fatcat:4bzusvmssjckxojgmcokkkjlem

On the Recursive Enumerability of Fixed-Point Combinators

Mayer Goldberg
2005 BRICS Report Series  
They are used to define recursive functions and circular data structures by replacing recursion and circularity with self-application.  ...  For any j > 0 we define: C j ≡ C(j) Q j ≡ C j ,{C j }, j We use this structure to maintain all the terms that can be reached from C j via any finite number of βη-steps, so as we move from V j to V j+1  ... 
doi:10.7146/brics.v12i1.21867 fatcat:fomn6lctfrgwfjy5dpwiktgsqm

The Aharonov–Bohm effect in a side-gated graphene ring

Magdalena Huefner, Françoise Molitor, Arnhild Jacobsen, Alessandro Pioda, Christoph Stampfer, Klaus Ensslin, Thomas Ihn
2010 New Journal of Physics  
We investigate the magnetoresistance of a side-gated ring structure etched out of single-layer graphene. We observe Aharonov-Bohm oscillations with about 5% visibility.  ...  The observed data can be well interpreted within existing models for 'dirty metals' giving a phase coherence length of the order of 1 micrometer at a temperature of 500mK.  ...  Electron beam lithography followed by reactive ion etching is used to define the structure.  ... 
doi:10.1088/1367-2630/12/4/043054 fatcat:qdp2cbzw5zb77eusg7ccndbokq

Angle-dependent magnetotransport in GaAs/InAs core/shell nanowires

Fabian Haas, Tobias Wenz, Patrick Zellekens, Nataliya Demarina, Torsten Rieger, Mihail Lepsa, Detlev Grützmacher, Hans Lüth, Thomas Schäpers
2016 Scientific Reports  
These are attributed to transport via angular momentum states, formed by electron waves within the InAs shell.  ...  At small tilt angles, when the magnetic field is aligned nearly parallel to the nanowire axis, we observe Aharonov-Bohm type h/e flux periodic magnetoconductance oscillations.  ...  We can model this behaviour via a simple approach.  ... 
doi:10.1038/srep24573 pmid:27091000 pmcid:PMC4835758 fatcat:qqpfd5dazveo3nxsrdt6japuzu

Beables, Primitive Ontology and Beyond: How Theories Meet the World [article]

Andrea Oldofredi
2021 arXiv   pre-print
Bohm and Bell's approaches to the foundations of quantum mechanics share notable features with the contemporary Primitive Ontology perspective and Esfeld and Deckert minimalist ontology.  ...  The principal aim of this essay is to spell out the relations as well as the main differences existing among such programs, which unfortunately remain often unnoticed in literature.  ...  In essence, Bohm stated that physical sciences and experimental data push us to a conception of nature composed by an infinity of different entities, which do not depend ontologically on a fixed set of  ... 
arXiv:2104.13859v1 fatcat:un62rcbwqfhibhk5tsi4ajz56m

Large transconductance oscillations in a single-well vertical Aharonov-Bohm interferometer

Vincenzo Piazza, Fabio Beltram, Werner Wegscheider, Chi-Te Liang, M. Pepper
2000 Physical Review B (Condensed Matter)  
Aharonov-Bohm (AB) interference is reported for the first time in the conductance of a vertical nanostructure based on a single GaAs/AlGaAs quantum well (QW).  ...  The pioneering work by Aharonov and Bohm had far-reaching fundamental implications as it pointed out the significance of potentials with respect to forces in quantum-mechanics [1] .  ...  Cr-Au nanogates are shown as bright regions and define a set of wires in the x direction. The Aharonov-Bohm ring is formed in the plane perpendicular to that of the image.  ... 
doi:10.1103/physrevb.62.r10630 fatcat:m27jt7cboje65g6vqfut46hlre

Metamorph: A Transformation Language for Semi-structured Data

Markus Michael Geipel, Christophe Böhme, Jan Hannemann
2015 D-Lib Magazine  
This data can be accessed via data dumps, through the web portal of the German National Library, or via SRU and OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) interfaces.  ...  This model of semi-structured data as a stream of events is similar to the Streaming API for XML (SAX) [14]. The events used by Metamorph are defined as Java interface shown in Listing 3.  ... 
doi:10.1045/may2015-boehme fatcat:fkoxpicj5jcbrozew5hhoxqrmq
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