Physical Review Letters

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Neutron Skin Turns Out to Be Soft
June 18, 2014

Nuclear experiments using photons as probes find that the outer, neutron-dominated layer of a nucleus is soft and wispy, rather than hard and well defined.

Synopsis on C. M. Tarbert et al. (Crystal Ball at MAMI and A2 Collaboration) Phys. Rev. Lett. 112, 242502 (2014)

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Repulsion Helps Virus Pack DNA
June 17, 2014

The motor that packs DNA into a virus works best if the DNA has some self-repulsion.

Synopsis on Nicholas Keller, Damian delToro, Shelley Grimes, Paul J. Jardine, and Douglas E. Smith Phys. Rev. Lett. 112, 248101 (2014)

EDITORS’ SUGGESTION
Localization-Delocalization Transitions in Turbophoresis of Inertial Particles
S. Belan, I. Fouxon, and G. Falkovich

A theoretical study of particles diffusing in a fluid subject to temperature or turbulent gradients, shows that, due to their inertia, heavy particles can escape local minima, such as walls, ‘flying’ away, where lighter particles will accumulate.

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Hyperfine Splitting of the 2s1/2 and 2p1/2 Levels in Li- and Be-like Ions of Pr59141
P. Beiersdorfer, E. Träbert, G. V. Brown, J. Clementson, D. B. Thorn, M. H. Chen, K. T. Cheng, and J. Sapirstein

Extreme ultraviolet spectroscopic measurements of the hyperfine splittings in high-Z ions provide insight into the fundamental interactions between light and atoms in strong fields.

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Single-Shot Readout and Relaxation of Singlet and Triplet States in Exchange-Coupled P31 Electron Spins in Silicon
Juan P. Dehollain, Juha T. Muhonen, Kuan Y. Tan, Andre Saraiva, David N. Jamieson, Andrew S. Dzurak, and Andrea Morello

Time-resolved measurements of the exchange coupling between pairs of phosphorous dopants in silicon give concrete ideas of what would be needed to implement 2-qubit quantum logic gates in this system.

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Value of H0 in the Inhomogeneous Universe
Ido Ben-Dayan, Ruth Durrer, Giovanni Marozzi, and Dominik J. Schwarz

Local measurements of the Hubble constant, for example from nearby supernovae, are shown to be affected by structures such as galaxy clusters, or voids, with the uncertainty that is introduced being comparable to current observational errors.

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A New Phase of Solid Oxygen
June 16, 2014

A large applied magnetic field can bring solid oxygen into a novel phase—a consequence of the strong spin-lattice coupling in the molecular crystal.

Viewpoint on T. Nomura, Y. H. Matsuda, S. Takeyama, A. Matsuo, K. Kindo, J. L. Her, and T. C. Kobayashi Phys. Rev. Lett. 112, 247201 (2014)

PRL
Cover Image: Phys. Rev. Lett. Vol. 112, Iss. 23
June 13, 2014

Overhead view of planar patterns obtained by shadow lithography: Evaporated metal atoms are deposited obliquely onto a monolayer colloidal crystal of spheres on a rotating substrate. Colors and brightness represent values of rotation and deposition tilt angles, respectively.

Sarah V. Kostinski, Elizabeth R. Chen, and Michael P. Brenner
Phys. Rev. Lett. 112, 235502 (2014)

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A Recipe for Error-Free Self-Assembly
June 11, 2014

Computer simulations suggest that mixtures of hundreds of distinct nanoparticles or colloids can self-assemble into well-defined structures.

Viewpoint on Aleks Reinhardt and Daan Frenkel Phys. Rev. Lett. 112, 238103 (2014)

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Top Quarks Go Solo in Rare Events
June 9, 2014

Separate collider experiments observe the top quark without its usual antiparticle partner in unique processes that could give insight into new physics, such as additional sets of quarks.

Viewpoint on S. Chatrchyan et al. (CMS Collaboration) Phys. Rev. Lett. 112, 231802 (2014) and T. Aaltonen et al. (CDF Collaboration)†, (D0 Collaboration)‡ Phys. Rev. Lett. 112, 231803 (2014)

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Modeling Biodiversity
June 5, 2014

Researchers have constructed a model of species dependence that shows how marine biodiversity could have grown and then leveled off.

Synopsis on Frank Stollmeier, Theo Geisel, and Jan Nagler Phys. Rev. Lett. 112, 228101 (2014)

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Crisis Averted for the Bose Glass
June 3, 2014

New simulations analyze the phase transition of a Bose glass to a superfluid, bringing to rest a discrepancy between theory and experiments.

Synopsis on Zhiyuan Yao, Karine P. C. da Costa, Mikhail Kiselev, and Nikolay Prokof’ev Phys. Rev. Lett. 112, 225301 (2014)

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A More Practical Polariton Laser
June 10, 2014

A new polariton laser is electrically powered and operates at room temperatures, making it more useful for optical electronic application than previous designs.

Synopsis on Pallab Bhattacharya, Thomas Frost, Saniya Deshpande, Md Zunaid Baten, Arnab Hazari, and Ayan Das Phys. Rev. Lett. 112, 236802 (2014)

EDITORS’ SUGGESTION
Self-Referenced Single-Electron Quantized Current Source
Lukas Fricke, Michael Wulf, Bernd Kaestner, Frank Hohls, Philipp Mirovsky, Brigitte Mackrodt, Ralf Dolata, Thomas Weimann, Klaus Pierz, Uwe Siegner, and Hans W. Schumacher

A circuit of multiple quantum dot single electron pumps could serve as a quantized-current standard for the SI unit of Ampere.

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Four-Quark State Confirmed
June 4, 2014

The LHCb experiment provides conclusive evidence for the existence of the four-quark particle called Z(4430).

Synopsis on R. Aaij et al. (LHCb Collaboration) Phys. Rev. Lett. 112, 222002 (2014)

EDITORS’ SUGGESTION
Enhanced Thermoelectric Performance and Anomalous Seebeck Effects in Topological Insulators
Yong Xu, Zhongxue Gan, and Shou-Cheng Zhang

For topological insulators, the thermoelectric performance is not an intrinsic material property, but can be tuned by changing the system size.

EDITORS’ SUGGESTION
Experimental Realization of a Compressed Quantum Simulation of a 32-Spin Ising Chain
Zhaokai Li, Hui Zhou, Chenyong Ju, Hongwei Chen, Wenqiang Zheng, Dawei Lu, Xing Rong, Changkui Duan, Xinhua Peng, and Jiangfeng Du

Using a quatum simulator with only five qubits, the simulation of a 32-spin Ising chain is experimentally demonstrated.

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