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Photonic Maxwell’s Demon

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Author(s): Mihai D. Vidrighin, Oscar Dahlsten, Marco Barbieri, M. S. Kim, Vlatko Vedral, and Ian A. Walmsley

Information derived from microscopic measurements of thermal states made using a few photons is used to extract macroscopic work.


[Phys. Rev. Lett. 116, 050401] Published Mon Feb 01, 2016

Mott Electrons in an Artificial Graphenelike Crystal of Rare-Earth Nickelate

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Author(s): S. Middey, D. Meyers, D. Doennig, M. Kareev, X. Liu, Y. Cao, Zhenzhong Yang, Jinan Shi, Lin Gu, P. J. Ryan, R. Pentcheva, J. W. Freeland, and J. Chakhalian

Geometrical engineering of nickelate-based heterostructures can result in artificial graphene-like Mott crystals with antiferromagnetic correlations, structures that are not seen in bulk nickelates.


[Phys. Rev. Lett. 116, 056801] Published Mon Feb 01, 2016

Electron Elevator: Excitations across the Band Gap via a Dynamical Gap State

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Author(s): A. Lim, W. M. C. Foulkes, A. P. Horsfield, D. R. Mason, A. Schleife, E. W. Draeger, and A. A. Correa

Ab initio simulations of electronic excitations produced when a semiconductor experiences a large perturbation show a new regime in electron-ion energy exchange whereby a defect state carries electrons across the band gap.


[Phys. Rev. Lett. 116, 043201] Published Wed Jan 27, 2016

Thermodynamics of an Attractive 2D Fermi Gas

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Author(s): K. Fenech, P. Dyke, T. Peppler, M. G. Lingham, S. Hoinka, H. Hu, and C. J. Vale

Two separate groups have extracted the thermodynamic equation of state for a two-dimensional gas of fermionic atoms, revealing its peculiar quantum features.


[Phys. Rev. Lett. 116, 045302] Published Wed Jan 27, 2016

Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise

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Author(s): M. R. Delbecq, T. Nakajima, P. Stano, T. Otsuka, S. Amaha, J. Yoneda, K. Takeda, G. Allison, A. Ludwig, A. D. Wieck, and S. Tarucha<br/>We extract the phase coherence of a qubit defined by singlet and triplet electronic states in a gated GaAs triple quantum dot, measuring on time scales much shorter than the decorrelation time of the environmental noise. In this nonergodic regime, we observe that the coherence is boosted and several…<br/><img src="//d22izw7byeupn1.cloudfront.net/journals/PRL/key_images/10.1103/PhysRevLett.116.046802.png" width="200" height="100"><br/>[Phys. Rev. Lett. 116, 046802] Published Tue Jan 26, 2016

Evidence of Halo Assembly Bias in Massive Clusters

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Author(s): Hironao Miyatake, Surhud More, Masahiro Takada, David N. Spergel, Rachel Mandelbaum, Eli S. Rykoff, and Eduardo Rozo

The clumping of galaxies and galaxy clusters has a subtle dependence on their assembly history—a predicted effect that has now been detected.


[Phys. Rev. Lett. 116, 041301] Published Mon Jan 25, 2016

On-Shell Recursion Relations for Effective Field Theories

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Author(s): Clifford Cheung, Karol Kampf, Jiri Novotny, Chia-Hsien Shen, and Jaroslav Trnka

A modern technique for computing scattering amplitudes—the key ingredients for predicting what particle physics experiments will observe—has now been extended to cover effective quantum field theories.


[Phys. Rev. Lett. 116, 041601] Published Mon Jan 25, 2016

Inflatable Dark Matter

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Author(s): Hooman Davoudiasl, Dan Hooper, and Samuel D. McDermottThe overabundance of dark matter predicted by many otherwise well-motivated models could be remedied if the universe underwent a period of late-time inflation.[Phys. Rev. Lett. 116, 03130…

Testing General Relativity with the Shadow Size of Sgr A^{*}

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Author(s): Tim Johannsen, Avery E. Broderick, Philipp M. Plewa, Sotiris Chatzopoulos, Sheperd S. Doeleman, Frank Eisenhauer, Vincent L. Fish, Reinhard Genzel, Ortwin Gerhard, and Michael D. Johnson

Deviations in the shadow of our Galaxy’s supermassive black hole could reveal violations of general relativity.


[Phys. Rev. Lett. 116, 031101] Published Tue Jan 19, 2016

Dark Matter Velocity Spectroscopy

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Author(s): Eric G. Speckhard, Kenny C. Y. Ng, John F. Beacom, and Ranjan Laha

Whether mysterious high-energy photon emissions from our Galaxy come from dark matter or a more mundane source might be resolved by detecting their Doppler shifts along different lines-of-sight.


[Phys. Rev. Lett. 116, 031301] Published Tue Jan 19, 2016

Ionization Avalanching in Clusters Ignited by Extreme-Ultraviolet Driven Seed Electrons

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Author(s): Bernd Schütte, Mathias Arbeiter, Alexandre Mermillod-Blondin, Marc J. J. Vrakking, Arnaud Rouzée, and Thomas Fennel

Nano-fireworks can be ignited by an invisible extreme-ultraviolet light flash. The extreme-ultraviolet pulse generates a few seed electrons, which are then multiplied in an ionization avalanche induced by heating from a near-infrared laser pulse.


[Phys. Rev. Lett. 116, 033001] Published Tue Jan 19, 2016

Bumblebee Flight in Heavy Turbulence

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Author(s): T. Engels, D. Kolomenskiy, K. Schneider, F.-O. Lehmann, and J. Sesterhenn

A simulation of a flying bee shows that insects don’t expend extra energy to maintain lift in turbulent air flow.


[Phys. Rev. Lett. 116, 028103] Published Fri Jan 15, 2016

Anomalous Depletion of Pore-Confined Carbon Dioxide upon Cooling below the Bulk Triple Point: An <i>In Situ</i> Neutron Diffraction Study

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Author(s): K. L. Stefanopoulos, F. K. Katsaros, Th. A. Steriotis, A. A. Sapalidis, M. Thommes, D. T. Bowron, and T. G. A. Youngs

Neutron scattering experiments indicate that CO2 confined in nanopores does not freeze when cooled below the triple point but instead vacates the pores and solidifies in the bulk. Upon reheating the CO2 refills the nanopores.


[Phys. Rev. Lett. 116, 025502] Published Thu Jan 14, 2016

Generation of Phase-Locked Pulses from a Seeded Free-Electron Laser

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Author(s): David Gauthier, Primož Rebernik Ribič, Giovanni De Ninno, Enrico Allaria, Paolo Cinquegrana, Miltcho Bojanov Danailov, Alexander Demidovich, Eugenio Ferrari, and Luca Giannessi

Frequency domain interferometry is used to generate two sequential phase-locked pulses from a free-electron laser in the X-ray to UV domain.


[Phys. Rev. Lett. 116, 024801] Published Thu Jan 14, 2016

On-Demand Single Photons with High Extraction Efficiency and Near-Unity Indistinguishability from a Resonantly Driven Quantum Dot in a Micropillar

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Author(s): Xing Ding, Yu He, Z.-C. Duan, Niels Gregersen, M.-C. Chen, S. Unsleber, S. Maier, Christian Schneider, Martin Kamp, Sven Höfling, Chao-Yang Lu, and Jian-Wei Pan

A quantum dot embedded in a micropillar is an efficient source of pure and indistinguishable single photons


[Phys. Rev. Lett. 116, 020401] Published Thu Jan 14, 2016

Zero-Area Single-Photon Pulses

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Author(s): L. S. Costanzo, A. S. Coelho, D. Pellegrino, M. S. Mendes, L. Acioli, K. N. Cassemiro, D. Felinto, A. Zavatta, and M. Bellini

Broadband single-photon pulses can have a strong, if transient, interaction with an atomic medium.


[Phys. Rev. Lett. 116, 023602] Published Wed Jan 13, 2016

Hanle Magnetoresistance in Thin Metal Films with Strong Spin-Orbit Coupling

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Author(s): Saül Vélez, Vitaly N. Golovach, Amilcar Bedoya-Pinto, Miren Isasa, Edurne Sagasta, Mikel Abadia, Celia Rogero, Luis E. Hueso, F. Sebastian Bergeret, and Fèlix Casanova

A new type of magnetoresistance is measured in thin nonmagnetic platinum films with strong spin-orbit coupling due to spin accumulation at the surface of the film.


[Phys. Rev. Lett. 116, 016603] Published Fri Jan 08, 2016

Self-Amplification of Solid Friction in Interleaved Assemblies

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Author(s): Héctor Alarcón, Thomas Salez, Christophe Poulard, Jean-Francis Bloch, Élie Raphaël, Kari Dalnoki-Veress, and Frédéric Restagno

A simple model borne out by experiments explains why it’s so hard to separate a pair of phonebooks whose pages have been interleaved.


[Phys. Rev. Lett. 116, 015502] Published Thu Jan 07, 2016

Complexified Path Integrals, Exact Saddles, and Supersymmetry

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Author(s): Alireza Behtash, Gerald V. Dunne, Thomas Schäfer, Tin Sulejmanpasic, and Mithat Ünsal

The fields and parameters in a path integral should be considered as complex quantities, even though they are real at the Lagrangian level, according to new calculations.


[Phys. Rev. Lett. 116, 011601] Published Wed Jan 06, 2016

Guiding Spin Spirals by Local Uniaxial Strain Relief

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Author(s): Pin-Jui Hsu, Aurore Finco, Lorenz Schmidt, André Kubetzka, Kirsten von Bergmann, and Roland Wiesendanger

Nanometer cycloidal spin spirals are observed on strained double-layers of iron where the layers have different lattice orientations.


[Phys. Rev. Lett. 116, 017201] Published Tue Jan 05, 2016

On-Chip Maxwell’s Demon as an Information-Powered Refrigerator

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Author(s): J. V. Koski, A. Kutvonen, I. M. Khaymovich, T. Ala-Nissila, and J. P. Pekola

A pair of connected single-electron devices functions as a Maxwell’s demon that operates without external control.

[Phys. Rev. Lett. 115, 260602] Published Wed Dec 30, 2015

Thermal Generation of Spin Current in an Antiferromagnet

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Author(s): S. Seki, T. Ideue, M. Kubota, Y. Kozuka, R. Takagi, M. Nakamura, Y. Kaneko, M. Kawasaki, and Y. TokuraExperiments show that a heat gradient can generate a spin-wave spin current in an antiferromagnetic insulator.[Phys. Rev. Lett. 115, 266601…

Quantum Delayed-Choice Experiment with a Beam Splitter in a Quantum Superposition

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Author(s): Shi-Biao Zheng, You-Peng Zhong, Kai Xu, Qi-Jue Wang, H. Wang, Li-Tuo Shen, Chui-Ping Yang, John M. Martinis, A. N. Cleland, and Si-Yuan Han

A beam splitter is placed in a quantum superposition state of being both active and inactive allowing the wave and particle aspects of the system to be observed in a single setup.


[Phys. Rev. Lett. 115, 260403] Published Mon Dec 28, 2015

Experimental Greenberger-Horne-Zeilinger-Type Six-Photon Quantum Nonlocality

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Author(s): Chao Zhang, Yun-Feng Huang, Zhao Wang, Bi-Heng Liu, Chuan-Feng Li, and Guang-Can Guo<br/>Quantum nonlocality gives us deeper insight into quantum physics. In addition, quantum nonlocality has been further recognized as an essential resource for device-independent quantum information processing in recent years. Most experiments of nonlocality are performed using a photonic system. Howeve…<br/><img src="//d22izw7byeupn1.cloudfront.net/journals/PRL/key_images/10.1103/PhysRevLett.115.260402.png" width="200" height="100"><br/>[Phys. Rev. Lett. 115, 260402] Published Wed Dec 23, 2015

Testing Einstein’s Equivalence Principle With Fast Radio Bursts

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Author(s): Jun-Jie Wei, He Gao, Xue-Feng Wu, and Peter Mészáros

Time delays between correlated photons emitted from fast radio bursts induced by the gravitational potential of the Milky Way provide the most accurate tests of Einstein’s equivalence principle to date.


[Phys. Rev. Lett. 115, 261101] Published Wed Dec 23, 2015

Observation of an Orbital Interaction-Induced Feshbach Resonance in ^{173} Yb

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Author(s): M. Höfer, L. Riegger, F. Scazza, C. Hofrichter, D. R. Fernandes, M. M. Parish, J. Levinsen, I. Bloch, and S. Fölling

Two separate groups have managed to control the interactions in a cold atomic gas in which each atom has two valence electrons.


[Phys. Rev. Lett. 115, 265302] Published Mon Dec 21, 2015

Magnetic Alignment of Block Copolymer Microdomains by Intrinsic Chain Anisotropy

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Author(s): Yekaterina Rokhlenko, Manesh Gopinadhan, Chinedum O. Osuji, Kai Zhang, Corey S. O’Hern, Steven R. Larson, Padma Gopalan, Paweł W. Majewski, and Kevin G. Yager

Experiments demonstrate that a magnetic field can cause polymers to organize into arrangements that are potentially useful for clean energy products.


[Phys. Rev. Lett. 115, 258302] Published Fri Dec 18, 2015

Broadband Acoustic Hyperbolic Metamaterial

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Author(s): Chen Shen, Yangbo Xie, Ni Sui, Wenqi Wang, Steven A. Cummer, and Yun JingAn array of rigid paper squares contained in aluminum frames is used to create a hyperbolic acoustic metamaterial.[Phys. Rev. Lett. 115, 254301] Published Wed Dec 16, 2015

Cosmological Higgs-Axion Interplay for a Naturally Small Electroweak Scale

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Author(s): J. R. Espinosa, C. Grojean, G. Panico, A. Pomarol, O. Pujolàs, and G. Servant

Weak coupling of the Higgs boson to two axionlike states could lead to a naturally small electroweak scale, which could be detected via their astrophysical and cosmological effects.


[Phys. Rev. Lett. 115, 251803] Published Wed Dec 16, 2015

Strong Loophole-Free Test of Local Realism

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Author(s): Lynden K. Shalm et al.

By closing two loopholes at once, three experimental tests of Bell’s inequalities remove the last doubts that we should renounce local realism. They also open the door to new quantum information technologies.


[Phys. Rev. Lett. 115, 250402] Published Wed Dec 16, 2015

Significant-Loophole-Free Test of Bell’s Theorem with Entangled Photons

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Author(s): Marissa Giustina, Marijn A. M. Versteegh, Sören Wengerowsky, Johannes Handsteiner, Armin Hochrainer, Kevin Phelan, Fabian Steinlechner, Johannes Kofler, Jan-Åke Larsson, Carlos Abellán, Waldimar Amaya, Valerio Pruneri, Morgan W. Mitchell, Jörn Beyer, Thomas Gerrits, Adriana E. Lita, Lynden K. Shalm, Sae Woo Nam, Thomas Scheidl, Rupert Ursin, Bernhard Wittmann, and Anton Zeilinger

By closing two loopholes at once, three experimental tests of Bell’s inequalities remove the last doubts that we should renounce local realism. They also open the door to new quantum information technologies.


[Phys. Rev. Lett. 115, 250401] Published Wed Dec 16, 2015

Experimental Evidence for Dark Excitons in Monolayer WSe_{2}

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Author(s): Xiao-Xiao Zhang, Yumeng You, Shu Yang Frank Zhao, and Tony F. HeinzPhotoluminescence measurements of WSe2, a 2D semiconductor, reveal optically forbidden excitations in the material.[Phys. Rev. Lett. 115, 257403] Published Tue Dec 15, 2015

Three New Low-Energy Resonances in the ^{22} Ne(p,γ) ^{23} Na Reaction

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Author(s): F. Cavanna et al. (The LUNA Collaboration)

New resonances are observed in 22Ne(p,γ)23Na reactions at energies relevant to element production in stars and novae. The resulting reaction rates are five times higher than previous measurements indicating a higher abundance of sodium and neon in these systems.


[Phys. Rev. Lett. 115, 252501] Published Tue Dec 15, 2015

Experimental Observation of Large Chern Numbers in Photonic Crystals

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Author(s): Scott A. Skirlo, Ling Lu, Yuichi Igarashi, Qinghui Yan, John Joannopoulos, and Marin Soljačić

A two-dimensional photonic crystal has multiple topologically protected channels, which can be used to transmit and reroute light without scattering losses.


[Phys. Rev. Lett. 115, 253901] Published Mon Dec 14, 2015

Neutral Hydrogen Structures Trace Dust Polarization Angle: Implications for Cosmic Microwave Background Foregrounds

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Author(s): S. E. Clark, J. Colin Hill, J. E. G. Peek, M. E. Putman, and B. L. Babler

The morphology of diffuse neutral hydrogen structures can provide information about the orientation of polarized dust emission, a significant source of foreground contamination to the B-mode polarization of the cosmic microwave background.


[Phys. Rev. Lett. 115, 241302] Published Fri Dec 11, 2015

Squeezing of Quantum Noise of Motion in a Micromechanical Resonator

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Author(s): J.-M. Pirkkalainen, E. Damskägg, M. Brandt, F. Massel, and M. A. Sillanpää

The act of a quantum measurement reduces the uncertainty in the motion of a vibrating membrane below the fundamental quantum limit.

[Phys. Rev. Lett. 115, 243601] Published Mon Dec 07, 2015

Heavy Tails in the Distribution of Time to Solution for Classical and Quantum Annealing

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Author(s): Damian S. Steiger, Troels F. Rønnow, and Matthias Troyer

Simulated quantum annealing, used in D-Wave systems, does not perform as well as classical annealing for computationally hard instances of the Ising spin glass problem, implying that median ‘time-to-solution’ is a poor measure of annealing algorithms.


[Phys. Rev. Lett. 115, 230501] Published Fri Dec 04, 2015

Test of Electric Charge Conservation with Borexino

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Author(s): M. Agostini et al. (Borexino Collaboration)

Scientists have placed new limits on how often electrons decay into neutrinos and photons, a reaction that—if it occurred—would violate the law of charge conservation.


[Phys. Rev. Lett. 115, 231802] Published Thu Dec 03, 2015

One-to-One Mapping between Steering and Joint Measurability Problems

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Author(s): Roope Uola, Costantino Budroni, Otfried Gühne, and Juha-Pekka Pellonpää

Quantum steering, the ability for Alice to use local measurements to steer Bob’s half of an entangled state, can be formulated in terms of a joint measurability problem allowing known techniques to be used from one protocol to the other.


[Phys. Rev. Lett. 115, 230402] Published Tue Dec 01, 2015

Tuning the van der Waals Interaction of Graphene with Molecules via Doping

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Author(s): Felix Huttmann, Antonio J. Martínez-Galera, Vasile Caciuc, Nicolae Atodiresei, Stefan Schumacher, Sebastian Standop, Ikutaro Hamada, Tim O. Wehling, Stefan Blügel, and Thomas Michely

By adding dopant atoms to a graphene sheet, researchers are able to control the van der Waals attraction that the surface exerts on molecules.


[Phys. Rev. Lett. 115, 236101] Published Tue Dec 01, 2015

Molecular Mechanism of Water Evaporation

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Author(s): Yuki Nagata, Kota Usui, and Mischa BonnEach time a liquid water molecule enters the vapor phase, a coordinated dance of several molecules is involved, according to simulations.[Phys. Rev. Lett. 115, 236102] Published Mon Nov 30, 2015

Ultrabroadband Dispersive Radiation by Spatiotemporal Oscillation of Multimode Waves

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Author(s): Logan G. Wright, Stefan Wabnitz, Demetrios N. Christodoulides, and Frank W. Wise<br/>In nonlinear dynamical systems, qualitatively distinct phenomena occur depending continuously on the size of the bounded domain containing the system. For nonlinear waves, a multimode waveguide is a bounded three-dimensional domain, allowing observation of dynamics impossible in open settings. Here …<br/>[Phys. Rev. Lett. 115, 223902] Published Wed Nov 25, 2015

Cosmological Relaxation of the Electroweak Scale

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Author(s): Peter W. Graham, David E. Kaplan, and Surjeet RajendranA theoretical proposal ties the puzzling light mass of the Higgs particle to a hypothetical new particle that plays an important role during the big bang.[Phys. Rev. Lett. 115, 221801] P…

Small Crowders Slow Down Kinesin-1 Stepping by Hindering Motor Domain Diffusion

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Author(s): Krzysztof Sozański, Felix Ruhnow, Agnieszka Wiśniewska, Marcin Tabaka, Stefan Diez, and Robert Hołyst

Researchers used a viscous fluid to disrupt the operation of a molecular motor that transports material inside biological cells, giving insights into how it works.


[Phys. Rev. Lett. 115, 218102] Published Fri Nov 20, 2015

Optical Metacages

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Author(s): Ali Mirzaei, Andrey E. Miroshnichenko, Ilya V. Shadrivov, and Yuri S. KivsharAn array of equally spaced nanowires, dubbed metacage, could block optical radiation from entering or escaping a region of arbitrary shape.[Phys. Rev. Lett. 115, 21…

Blast Dynamics in a Dissipative Gas

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Author(s): M. Barbier, D. Villamaina, and E. TrizacSelf-similar corrugated instabilities form after intense localized explosions in dissipative gasses.[Phys. Rev. Lett. 115, 214301] Published Tue Nov 17, 2015

Standard Model Prediction for Direct CP Violation in K→ππ Decay

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Author(s): Z. Bai, T. Blum, P. A. Boyle, N. H. Christ, J. Frison, N. Garron, T. Izubuchi, C. Jung, C. Kelly, C. Lehner, R. D. Mawhinney, C. T. Sachrajda, A. Soni, and D. Zhang (RBC and UKQCD Collaborations)<br/>We report the first lattice QCD calculation of the complex kaon decay amplitude A_{0} with physical kinematics, using a 32^{3}×64 lattice volume and a single lattice spacing a, with 1/a=1.3784(68)  GeV. We find Re(A_{0})=4.66(1.00)(1.26)×10^{−7}  GeV and Im(A_{0})=−1.90(1.23)(1.08)×10^{−11}  GeV, wh…<br/><img src="//d22izw7byeupn1.cloudfront.net/journals/PRL/key_images/10.1103/PhysRevLett.115.212001.png" width="200" height="100"><br/>[Phys. Rev. Lett. 115, 212001] Published Tue Nov 17, 2015

Exploring the Single Atom Spin State by Electron Spectroscopy

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Author(s): Yung-Chang Lin, Po-Yuan Teng, Po-Wen Chiu, and Kazu Suenaga<br/>To control the spin state of an individual atom is an ultimate goal for spintronics. A single atom magnet, which may lead to a supercapacity memory device if realized, requires the high-spin state of an isolated individual atom. Here, we demonstrate the realization of well isolated transition metal …<br/>[Phys. Rev. Lett. 115, 206803] Published Thu Nov 12, 2015