[2DES/QHE] Optical Hall Effect in the Integer Quantum Hall Regime

http://arxiv.org/abs/1004.0308

[graphene/thermal] Thermal infrared emission reveals the Dirac point movement in biased graphene

arXiv:1004.0369

also:

Imaging, simulation, and electrostatic control of power dissipation in
graphene devices
http://arxiv.org/abs/1004.0287

[AMO/disorder] Anisotropic 2D diffusive expansion of ultra-cold atoms in a disordered potential

arXiv:1004.0312

[Graphene] Direct Chemical Vapor Deposition of Graphene on Dielectric Surfaces

http://pubs.acs.org/doi/pdf/10.1021/nl9037714

[graphene/surface/plasma] Observation of Raman G-band splitting in top-doped few-layer graphene

Observation of Raman G-band splitting in top-doped few-layer graphene
Matteo Bruna and Stefano Borini
Physical Review B 81,125421 (2010) (7 pages)

[H-adsorption] Boron-tuned bonding mechanism of Li-graphene complex for reversible hydrogen storage

Appl. Phys. Lett. 96, 123101 (2010); doi:10.1063/1.3367773

[nano/general] Atom-by-atom structural and chemical analysis by annular dark-field electron microscopy

http://www.nature.com/nature/journal/v464/n7288/full/nature08879.html

[2DES/QHE] Anomalous structure in the single particle spectrum of the fractional quantum Hall effect

http://www.nature.com/nature/journal/v464/n7288/full/nature08941.html

scanning capacitance microscopies DOS

[electronics/general] Looking beyong Si (Science special issue)

http://www.sciencemag.org/cgi/content/full/sci;327/5973/1595

review by T. Theis

and articles on oxides, stretchable electronics etc.

[AMO/technology] A cold atom pyramidal gravimeter with a single laser beam

Appl. Phys. Lett. 96, 134101 (2010)

We demonstrate a scheme for realizing a compact cold atom gravimeter. The use of a hollow pyramidal configuration allows to achieve all functions: trapping, interferometer and detection with a unique laser beam leading to a drastic reduction in complexity and volume. In particular, we demonstrate a relative sensitivity to acceleration of gravity (g) of 1.7×10⁻⁷ at one second, with a moderate laser power of 50 mW. This simple geometry combined to such a high sensitivity opens wide perspectives for practical applications.

[rad detection/electrooptics] Electric field distributions in CdZnTe due to reduced temperature and x-ray irradiation

Appl. Phys. Lett. 96, 133509 (2010)

[graphene] Multilayered graphene used as anode of organic light emitting devices

In this report, we find multilayered graphene, which has good transparency, conductivity and suitable work function, can be used as the anode for the organic light emitting device. Our device structure is Al/glass/multilayered graphene/V₂O₅/NPB/CBP:(ppy)₂Ir(acac)/Bphen/Bphen:Cs₂CO₃/Sm/Au. The maximum luminance efficiency and maximum power efficiency reach 0.75 cd/A and 0.38 lm/W, respectively. We believe that by optimizing the hole density and uniforming the thickness of the multilayered graphene anode, the device efficiency can be remarkably increased in the future.

[graphene] Controllable graphene N-doping with ammonia plasma

Here we show that gas-phase doping by means of NH₃ plasma exposure is a highly flexible and manufacturable process for graphene electronics. The nitrogen-containing radicals can readily form covalent bonds with the carbon lattice and keep stable in the postannealing for damage restoration. The amount of charge transfer can be fine tuned by controlling the exposure time and monitored by the systematic shift in the Raman G mode and the G_ds−V_g curves in transport measurements. The maximum doping level can reach 1.5×10¹³ cm⁻². {but: disorder created! though: effect on quantum transport may be interesting...}

[nano/sensor] Gas Sensor Based on Metal−Insulator Transition in VO2 Nanowire Thermistor

http://pubs.acs.org/doi/abs/10.1021/nl900676n

Using temperature driven sharp metal−insulator phase transition in single crystal VO₂ nanowires, the realization of a novel gas sensing concept has been tested. Varying the temperature of the nanowire close to the transition edge, the conductance of the nanowire becomes extremely responsive to the tiny changes in molecular composition, pressure, and temperature of the ambient gas environment. This gas sensing analog of the transition edge sensor radiometry used in astrophysics opens new opportunities in gas sensorics.

[nano] Tuning the band gap of semiconducting carbon nanotube by an axial magnetic field

We have investigated the magnetic field dependence of transfer characteristics of a device fabricated in a configuration of a field-effect transistor with a conduction channel formed by a semiconducting multiwalled carbon nanotube. Our results unambiguously indicate that an axial magnetic field suppresses the band gap of the nanotube. Quantitative analysis of the data indicates linear dependence of the band gap on magnetic field as well as a linear splitting between the K and K′ subbands of the band structure of the nanotube.

Appl. Phys. Lett. 96, 132101 (2010); doi:10.1063/1.3360214

[QC/solid state] Hyperfine Structure and Nuclear Hyperpolarization Observed in the Bound Exciton Luminescence of Bi Donors in Natural Si

http://prl.aps.org/pdf/PRL/v104/i13/e137402

As the deepest group-V donor in Si, Bi has by far the largest hyperfine interaction and also a large I=9/2 nuclear spin. At zero field this splits the donor ground state into states having total spin 5 and 4, which are fully resolved in the photoluminescence spectrum of Bi donor bound excitons. Under a magnetic field, the 60 expected allowed transitions cannot be individually resolved, but the effects of the nuclear spin distribution, -9/2≤I_z≤9/2, are clearly observed. A strong hyperpolarization of the nuclear spin towards I_z=-9/2 is observed to result from the nonresonant optical excitation. This is very similar to the recently reported optical hyperpolarization of P donors observed by EPR at higher magnetic fields. We introduce a new model to explain this effect, and predict that it may be very fast.

[optics/Quantum Comp/nano] Interference of Single Photons from Two Separate Semiconductor Quantum Dots

Interference of Single Photons from Two Separate Semiconductor Quantum Dots
http://prl.aps.org/pdf/PRL/v104/i13/e137401

[CMP] Observation of Spin-Triplet Superconductivity in Co-Based Josephson Junctions

http://prl.aps.org/pdf/PRL/v104/i13/e137002

http://prl.aps.org/abstract/PRL/v104/i13/e137002

[CMP] Dirac cone in iron-based superconductors

http://physics.aps.org/viewpoint-for/10.1103/PhysRevLett.104.137001

http://prl.aps.org/abstract/PRL/v104/i13/e137001

[nano/optics/thermal]Mapping Heat Origin in Plasmonic Structures

We investigate the physics of photoinduced heat generation in plasmonic structures by using a novel thermal microscopy technique based on molecular fluorescence polarization anisotropy. This technique enables us to image the heat source distribution in light-absorbing systems such as plasmonic nanostructures. ...

http://prl.aps.org/pdf/PRL/v104/i13/e136805

[nice: localized heating by shining light on gold nanoparticles/nanowires; localized thermometry by molecular rotational polarization spectroscopy!]

Extra Spin-Wave Mode in [2DES/QHE] Quantum Hall Systems: Beyond the Skyrmion Limit

We report on the observation of a new spin mode in a quantum Hall system in the vicinity of odd electron filling factors under experimental conditions excluding the possibility of Skyrmion excitations. The new mode having presumably zero energy at odd filling factors emerges at small deviations from odd filling factors and couples to the spin exciton. The existence of an extra spin mode assumes a nontrivial magnetic order at partial fillings of Landau levels surrounding quantum Hall ferromagnets other then the Skyrmion crystal.

[Raman scattering]

[Graphene] Spectroscopic Measurement of Interlayer Screening in Multilayer Epitaxial Graphene

http://prl.aps.org/pdf/PRL/v104/i13/e136802
The substrate-induced charge-density profile in carbon face epitaxial graphene is determined using nondegenerate ultrafast midinfrared pump-probe spectroscopy. Distinct zero crossings in the differential transmission spectra are used to identify the Fermi levels of layers within the multilayer stack. Probing
within the transmission window of the SiC substrate, we find the Fermi levels of the first four heavily
doped layers to be, respectively, 360, 215, 140, and 93 meV above the Dirac point. The charge screening
length is determined to be one graphene layer, in good agreement with theoretical predictions.

[AMO/general] Speckle Instability: Coherent Effects in Nonlinear Disordered Media

PRL 104, 133901 (2010)
We numerically investigate the properties of speckle patterns formed by nonlinear point scatterers. We show that, in the weak localization regime, dynamical instability appears, eventually leading to chaotic behavior of the system.
{BEC, nonlinear optics?...}

[AMO] Coherent Control of Angular Momentum Transfer in Resonant Two-Photon Light-Matter Interaction

polarization-shaped femtosecond laser pulse with a zero net angular momentum creates a net angular momentum in atomic rubidium during resonant twophoton
excitation.
PRL 104, 133001 (2010)
http://prl.aps.org/abstract/PRL/v104/i13/e136803