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Symmetries and optical transitions of hexagonal quantum dots in GaAs/AlGaAs nanowires

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Le temple d'Hathor à Dendara

Dendara, July 16, 54 BCE, began the reconstruction of the temple dedicated to the goddess Hathor. Founded under Ptolemy XII, the temple studied here stands at the end of an architectural tradition developed over three millennia. Its state of conservation i ...

EPFL2004

The study of incommensurate structures as a probe to reveal atomic interactions in crystals

Gervais Chapuis, Alla Arakcheeva

The structure of aperiodic crystals which includes incommensurate, quasi- and composite crystals is usually described in spaces of higher dimension, the so called superspace. The main advantage of the superspace formalism is that an aperiodic structure in ...

2004

Oscillatory behaviour in the nonlinear emission of semiconductor microcavities

Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Victoria Ciulin

We have observed marked oscillations in the time-resolved photoluminescence of a semiconductor microcavity under non-resonant excitation conditions. Hot excitons, created with an ultrashort light pulse, rapidly relax into polaritons in the cavity with a la ...

2004

The application and interpretation of Keeling plots in terrestrial carbon cycle research

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Photosynthesis and respiration impart distinct isotopic signatures to the atmosphere that are used to constrain global carbon source/sink estimates and partition ecosystem fluxes. Increasingly, the "Keeling plot'' method is being used to determine the carb ...

2003

An authentication scheme based on roots of sparse polynomials

Mohammad Amin Shokrollahi

We describe an authentication scheme whose security is based on the hardness of finding roots of systems of sparse polynomial equations in many variables and of high degree. One of the new ideas is the use of many keys. In one authentication session, a sma ...

2003

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2002

Total asymmetric synthesis of a new 9,12-anhydroerythronolide aglycone

Pierre Vogel, Sandrine Gerber

Two novel, potentially antimicrobial erythronolide aglycon analogs ((-)-9 and (-)-30, respectively), which incorporate a large number of contiguous stereogenic centers, have been prepared by multistep synthesis from simple chirons. The chemistry presented ...

2002

Near-field imaging of one-dimensional excitons delocalized over mesoscopic distances

Benoît Marie Joseph Deveaud, Andrea Crottini, Xiao Wang

Near-field optical spectroscopy is used to investigate the effects of disorder in the optical processes in semiconductor quantum wires. We observe photoluminescence emissions from extended, delocalized excitons at low temperatures (5 K) and low excitation ...

2001

The condensation origin of zoned metal grains in Queen Alexandra Range 94411: Implications for the formation of the Bencubbin-like chondrites

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Thermodynamic analysis of the compositional profiles across large chemically-zoned Fe,Ni metal grains in the Bencubbin-like chondrite Queen Alexandra Range (QUE) 94411 suggests that these grains formed by non-equilibrium gas-solid condensation under variab ...

2001

trEST, trGEN and Hits: access to databases of predicted protein sequences

Philipp Bucher

High throughput genome (HTG) and expressed sequence tag (EST) sequences are currently the most abundant nucleotide sequence classes in the public database. The large volume, high degree of fragmentation and lack of gene structure annotations prevent effici ...

2001

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