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Geometrical Destabilization of Inflation

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Author(s): Sébastien Renaux-Petel and Krzysztof Turzyński

A general mechanism is proposed by which curvature effects can prematurely end inflation, excluding some otherwise viable models.


[Phys. Rev. Lett. 117, 141301] Published Tue Sep 27, 2016

Geometrical Destabilization of Inflation

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Author(s): Sébastien Renaux-Petel and Krzysztof Turzyński

A general mechanism is proposed by which curvature effects can prematurely end inflation, excluding some otherwise viable models.


[Phys. Rev. Lett. 117, 141301] Published Tue Sep 27, 2016

Observation of Coupled Vortex Lattices in a Mass-Imbalance Bose and Fermi Superfluid Mixture

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Author(s): Xing-Can Yao, Hao-Ze Chen, Yu-Ping Wu, Xiang-Pei Liu, Xiao-Qiong Wang, Xiao Jiang, Youjin Deng, Yu-Ao Chen, and Jian-Wei Pan

Researchers mixed two superfluids of different atoms together and observed that vortices in one affected those in the other—evidence of mutual interaction between the two species.


[Phys. Rev. Lett. 117, 145301] Published Tue Sep 27, 2016

Power Series Approximation for the Correlation Kernel Leading to Kohn-Sham Methods Combining Accuracy, Computational Efficiency, and General Applicability

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Author(s): Jannis Erhard, Patrick Bleiziffer, and Andreas Görling

A new approach to calculating the properties of molecules and solids may offer higher accuracy at reasonable computational cost, accelerating the discovery of useful materials.


[Phys. Rev. Lett. 117, 143002] Published Mon Sep 26, 2016

Power Series Approximation for the Correlation Kernel Leading to Kohn-Sham Methods Combining Accuracy, Computational Efficiency, and General Applicability

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Author(s): Jannis Erhard, Patrick Bleiziffer, and Andreas Görling

A new approach to calculating the properties of molecules and solids may offer higher accuracy at reasonable computational cost, accelerating the discovery of useful materials.


[Phys. Rev. Lett. 117, 143002] Published Mon Sep 26, 2016

Coherent Backscattering of Light Off One-Dimensional Atomic Strings

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Author(s): H. L. Sørensen, J.-B. Béguin, K. W. Kluge, I. Iakoupov, A. S. Sørensen, J. H. Müller, E. S. Polzik, and J. Appel

Up to 75% of light reflects from just 2000 atoms aligned along an optical fiber, an arrangement that could be useful in photonic circuits.


[Phys. Rev. Lett. 117, 133604] Published Fri Sep 23, 2016

Coherent Backscattering of Light Off One-Dimensional Atomic Strings

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Author(s): H. L. Sørensen, J.-B. Béguin, K. W. Kluge, I. Iakoupov, A. S. Sørensen, J. H. Müller, E. S. Polzik, and J. Appel

Up to 75% of light reflects from just 2000 atoms aligned along an optical fiber, an arrangement that could be useful in photonic circuits.


[Phys. Rev. Lett. 117, 133604] Published Fri Sep 23, 2016

Revealing Three-Dimensional Structure of an Individual Colloidal Crystal Grain by Coherent X-Ray Diffractive Imaging

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Author(s): A. G. Shabalin, J.-M. Meijer, R. Dronyak, O. M. Yefanov, A. Singer, R. P. Kurta, U. Lorenz, O. Y. Gorobtsov, D. Dzhigaev, S. Kalbfleisch, J. Gulden, A. V. Zozulya, M. Sprung, A. V. Petukhov, and I. A. Vartanyants

Coherent x-ray diffraction imaging via an iterative phase retrieval approach allows for the visualization of the 3D positions of individual particles in a single colloidal crystal grain.


[Phys. Rev. Lett. 117, 138002] Published Thu Sep 22, 2016

Revealing Three-Dimensional Structure of an Individual Colloidal Crystal Grain by Coherent X-Ray Diffractive Imaging

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Author(s): A. G. Shabalin, J.-M. Meijer, R. Dronyak, O. M. Yefanov, A. Singer, R. P. Kurta, U. Lorenz, O. Y. Gorobtsov, D. Dzhigaev, S. Kalbfleisch, J. Gulden, A. V. Zozulya, M. Sprung, A. V. Petukhov, and I. A. Vartanyants

Coherent x-ray diffraction imaging via an iterative phase retrieval approach allows for the visualization of the 3D positions of individual particles in a single colloidal crystal grain.


[Phys. Rev. Lett. 117, 138002] Published Thu Sep 22, 2016

How Isotropic is the Universe?

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Author(s): Daniela Saadeh, Stephen M. Feeney, Andrew Pontzen, Hiranya V. Peiris, and Jason D. McEwenA new study of the cosmic microwave background places the strictest limits to date on a rotating Universe and other forms of cosmic anisotropy.[Phys. Re…

Magneto-Optical Signature of Massless Kane Electrons in Cd_{3} As_{2}

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Author(s): A. Akrap, M. Hakl, S. Tchoumakov, I. Crassee, J. Kuba, M. O. Goerbig, C. C. Homes, O. Caha, J. Novák, F. Teppe, W. Desrat, S. Koohpayeh, L. Wu, N. P. Armitage, A. Nateprov, E. Arushanov, Q. D. Gibson, R. J. Cava, D. van der Marel, B. A. Piot, C. Faugeras, G. Martinez, M. Potemski, and M. Orlita

Optical reflectivity experiments on Cd3As2 indicate the presence of Kane electrons rather than Dirac fermions in this material. The results contradict those from recent ARPES experiments, but agree with recent STM results.


[Phys. Rev. Lett. 117, 136401] Published Wed Sep 21, 2016

Stress Singularities in Swelling Soft Solids

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Author(s): Alain Goriely, Johannes Weickenmeier, and Ellen KuhlA swelling brain bulging out of a circular opening in the skull exhibits a stress singularity (similar to that seen for punch indentation) at the point of contact with the skull.[Phys. Rev….

How Isotropic is the Universe?

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Author(s): Daniela Saadeh, Stephen M. Feeney, Andrew Pontzen, Hiranya V. Peiris, and Jason D. McEwenA new study of the cosmic microwave background places the strictest limits to date on a rotating Universe and other forms of cosmic anisotropy.[Phys. Re…

Stress Singularities in Swelling Soft Solids

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Author(s): Alain Goriely, Johannes Weickenmeier, and Ellen KuhlA swelling brain bulging out of a circular opening in the skull exhibits a stress singularity (similar to that seen for punch indentation) at the point of contact with the skull.[Phys. Rev….

Magneto-Optical Signature of Massless Kane Electrons in Cd_{3} As_{2}

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Author(s): A. Akrap, M. Hakl, S. Tchoumakov, I. Crassee, J. Kuba, M. O. Goerbig, C. C. Homes, O. Caha, J. Novák, F. Teppe, W. Desrat, S. Koohpayeh, L. Wu, N. P. Armitage, A. Nateprov, E. Arushanov, Q. D. Gibson, R. J. Cava, D. van der Marel, B. A. Piot, C. Faugeras, G. Martinez, M. Potemski, and M. Orlita

Optical reflectivity experiments on Cd3As2 indicate the presence of Kane electrons rather than Dirac fermions in this material. The results contradict those from recent ARPES experiments, but agree with recent STM results.


[Phys. Rev. Lett. 117, 136401] Published Wed Sep 21, 2016

Continuous Quantum Nondemolition Measurement of the Transverse Component of a Qubit

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Author(s): U. Vool, S. Shankar, S. O. Mundhada, N. Ofek, A. Narla, K. Sliwa, E. Zalys-Geller, Y. Liu, L. Frunzio, R. J. Schoelkopf, S. M. Girvin, and M. H. Devoret

The transverse component of a superconducting qubit is continuously measured for the first time, showing quantum jumps between its eigenstates.


[Phys. Rev. Lett. 117, 133601] Published Mon Sep 19, 2016

Nuclear Binding Near a Quantum Phase Transition

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Author(s): Serdar Elhatisari, Ning Li, Alexander Rokash, Jose Manuel Alarcón, Dechuan Du, Nico Klein, Bing-nan Lu, Ulf-G. Meißner, Evgeny Epelbaum, Hermann Krebs, Timo A. Lähde, Dean Lee, and Gautam Rupak

Simulations predict that the ground states of certain light nuclei lie near a quantum phase transition between a liquid-like phase and a phase involving clusters of alpha particles.


[Phys. Rev. Lett. 117, 132501] Published Mon Sep 19, 2016

Continuous Quantum Nondemolition Measurement of the Transverse Component of a Qubit

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Author(s): U. Vool, S. Shankar, S. O. Mundhada, N. Ofek, A. Narla, K. Sliwa, E. Zalys-Geller, Y. Liu, L. Frunzio, R. J. Schoelkopf, S. M. Girvin, and M. H. Devoret

The transverse component of a superconducting qubit is continuously measured for the first time, showing quantum jumps between its eigenstates.


[Phys. Rev. Lett. 117, 133601] Published Mon Sep 19, 2016

Nuclear Binding Near a Quantum Phase Transition

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Author(s): Serdar Elhatisari, Ning Li, Alexander Rokash, Jose Manuel Alarcón, Dechuan Du, Nico Klein, Bing-nan Lu, Ulf-G. Meißner, Evgeny Epelbaum, Hermann Krebs, Timo A. Lähde, Dean Lee, and Gautam Rupak

Simulations predict that the ground states of certain light nuclei lie near a quantum phase transition between a liquid-like phase and a phase involving clusters of alpha particles.


[Phys. Rev. Lett. 117, 132501] Published Mon Sep 19, 2016

Dense Axion Stars

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Author(s): Eric Braaten, Abhishek Mohapatra, and Hong ZhangAxions, if they make up the dark mater, could form dense stars balanced by gravity and the mean-field pressure of the axion Bose-Einstein condensate.[Phys. Rev. Lett. 117, 121801] Published Fri…

High-Brightness High-Energy Electron Beams from a Laser Wakefield Accelerator via Energy Chirp Control

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Author(s): W. T. Wang, W. T. Li, J. S. Liu, Z. J. Zhang, R. Qi, C. H. Yu, J. Q. Liu, M. Fang, Z. Y. Qin, C. Wang, Y. Xu, F. X. Wu, Y. X. Leng, R. X. Li, and Z. Z. Xu

Using a new two-stage acceleration scheme, where electron injection and seeding are controlled in different periods of the laser wakefield, high-quality tunable electron beams are produced with brightnesses close to those achieved in state-of-the-art linac drivers.


[Phys. Rev. Lett. 117, 124801] Published Fri Sep 16, 2016

Dense Axion Stars

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Author(s): Eric Braaten, Abhishek Mohapatra, and Hong ZhangAxions, if they make up the dark mater, could form dense stars balanced by gravity and the mean-field pressure of the axion Bose-Einstein condensate.[Phys. Rev. Lett. 117, 121801] Published Fri…

High-Brightness High-Energy Electron Beams from a Laser Wakefield Accelerator via Energy Chirp Control

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Author(s): W. T. Wang, W. T. Li, J. S. Liu, Z. J. Zhang, R. Qi, C. H. Yu, J. Q. Liu, M. Fang, Z. Y. Qin, C. Wang, Y. Xu, F. X. Wu, Y. X. Leng, R. X. Li, and Z. Z. Xu

Using a new two-stage acceleration scheme, where electron injection and seeding are controlled in different periods of the laser wakefield, high-quality tunable electron beams are produced with brightnesses close to those achieved in state-of-the-art linac drivers.


[Phys. Rev. Lett. 117, 124801] Published Fri Sep 16, 2016

Observation of the Quantum Anomalous Hall Insulator to Anderson Insulator Quantum Phase Transition and its Scaling Behavior

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Author(s): Cui-Zu Chang, Weiwei Zhao, Jian Li, J. K. Jain, Chaoxing Liu, Jagadeesh S. Moodera, and Moses H. W. Chan

A quantum phase transition between two insulating phases of a magnetic topological insulator is observed experimentally by tuning the material’s chemical potential.


[Phys. Rev. Lett. 117, 126802] Published Wed Sep 14, 2016

Observation of the Quantum Anomalous Hall Insulator to Anderson Insulator Quantum Phase Transition and its Scaling Behavior

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Author(s): Cui-Zu Chang, Weiwei Zhao, Jian Li, J. K. Jain, Chaoxing Liu, Jagadeesh S. Moodera, and Moses H. W. Chan

A quantum phase transition between two insulating phases of a magnetic topological insulator is observed experimentally by tuning the material’s chemical potential.


[Phys. Rev. Lett. 117, 126802] Published Wed Sep 14, 2016

Direct Measurement of the Density Matrix of a Quantum System

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Author(s): G. S. Thekkadath, L. Giner, Y. Chalich, M. J. Horton, J. Banker, and J. S. Lundeen

Researchers have developed a new technique to measure the density matrix—a more general way of characterizing the state of a quantum system than that provided by the wave function.


[Phys. Rev. Lett. 117, 120401] Published Mon Sep 12, 2016

Direct Measurement of the Density Matrix of a Quantum System

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Author(s): G. S. Thekkadath, L. Giner, Y. Chalich, M. J. Horton, J. Banker, and J. S. Lundeen

Researchers have developed a new technique to measure the density matrix—a more general way of characterizing the state of a quantum system than that provided by the wave function.


[Phys. Rev. Lett. 117, 120401] Published Mon Sep 12, 2016

Chaos in AdS_{2} Holography

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Author(s): Kristan JensenA theoretical analysis points at a possible connection between near-conformal two-dimensional gravity and a fermionic quantum mechanical system with applications to condensed matter physics.[Phys. Rev. Lett. 117, 111601] Publis…

Fourier-Transform Ghost Imaging with Hard X Rays

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Author(s): Hong Yu, Ronghua Lu, Shensheng Han, Honglan Xie, Guohao Du, Tiqiao Xiao, and Daming ZhuThe technique of ghost imaging, which builds up images of objects by combining information from light collected at two detectors, has been demonstrated in…

Experimental X-Ray Ghost Imaging

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Author(s): Daniele Pelliccia, Alexander Rack, Mario Scheel, Valentina Cantelli, and David M. PaganinThe technique of ghost imaging, which builds up images of objects by combining information from light collected at two detectors, has been demonstrated …

Chaos in AdS_{2} Holography

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Author(s): Kristan JensenA theoretical analysis points at a possible connection between near-conformal two-dimensional gravity and a fermionic quantum mechanical system with applications to condensed matter physics.[Phys. Rev. Lett. 117, 111601] Publis…

Floquet Time Crystals

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Author(s): Dominic V. Else, Bela Bauer, and Chetan NayakTime-translation symmetry can be spontaneously broken in driven quantum systems opening the door to time crystals, according to new theoretical predictions.[Phys. Rev. Lett. 117, 090402] Published…

Lensing of Fast Radio Bursts as a Probe of Compact Dark Matter

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Author(s): Julian B. Muñoz, Ely D. Kovetz, Liang Dai, and Marc Kamionkowski

Gravitational lensing of fast radio bursts around compact dark matter objects larger than twenty solar masses could be detected in upcoming experiments allowing constraints to be placed on the fraction of dark matter they contain.


[Phys. Rev. Lett. 117, 091301] Published Wed Aug 24, 2016

Attosecond Delays in Molecular Photoionization

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Author(s): Martin Huppert, Inga Jordan, Denitsa Baykusheva, Aaron von Conta, and Hans Jakob Wörner

Attosecond-resolution experiments have determined the delay in an electron’s emission from a molecule after being ionized with light.


[Phys. Rev. Lett. 117, 093001] Published Mon Aug 22, 2016

Strain Engineering of the Band Gap of HgTe Quantum Wells Using Superlattice Virtual Substrates

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Author(s): Philipp Leubner, Lukas Lunczer, Christoph Brüne, Hartmut Buhmann, and Laurens W. Molenkamp

The band gap of HgTe quantum wells can be controlled by adjusting their strain via a substrate lattice mismatch. ​The achieved band gap of 55 meV is well above room temperature thermal energy, which may allow for technical applications of these 2D topological insulators.


[Phys. Rev. Lett. 117, 086403] Published Fri Aug 19, 2016

Decoupling Edge Versus Bulk Conductance in the Trivial Regime of an InAs/GaSb Double Quantum Well Using Corbino Ring Geometry

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Author(s): Binh-Minh Nguyen, Andrey A. Kiselev, Ramsey Noah, Wei Yi, Fanming Qu, Arjan J. A. Beukman, Folkert K. de Vries, Jasper van Veen, Stevan Nadj-Perge, Leo P. Kouwenhoven, Morten Kjaergaard, Henri J. Suominen, Fabrizio Nichele, Charles M. Marcus, Michael J. Manfra, and Marko Sokolich

A semiconductor quantum well with a concentric geometry enables experimentalists to decouple bulk and edge conduction channels.


[Phys. Rev. Lett. 117, 077701] Published Fri Aug 12, 2016

Preparation of Ultracold Atom Clouds at the Shot Noise Level

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Author(s): M. Gajdacz, A. J. Hilliard, M. A. Kristensen, P. L. Pedersen, C. Klempt, J. J. Arlt, and J. F. Sherson

A new technique allows researchers to specify the number of atoms in an ultracold cloud (in the millions) and then to reproduce that same number in repeated experiments.


[Phys. Rev. Lett. 117, 073604] Published Fri Aug 12, 2016

Searches for Sterile Neutrinos with the IceCube Detector

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Author(s): M. G. Aartsen et al. (IceCube Collaboration)

A search for sterile neutrinos with the IceCube detector has found no evidence for the hypothetical particles, significantly narrowing the range of masses that a new kind of neutrino could possibly have.


[Phys. Rev. Lett. 117, 071801] Published Mon Aug 08, 2016

Three-Dimensional Icosahedral Phase Field Quasicrystal

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Author(s): P. Subramanian, A. J. Archer, E. Knobloch, and A. M. Rucklidge

A 3D phase field crystal model is used to explore the formation and stability of icosahedral quasicrystals. The mechanisms that stabilize 2D quasicrystals also play a role in this 3D system.


[Phys. Rev. Lett. 117, 075501] Published Mon Aug 08, 2016

Detecting Gravitational-Wave Memory with LIGO: Implications of GW150914

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Author(s): Paul D. Lasky, Eric Thrane, Yuri Levin, Jonathan Blackman, and Yanbei Chen

A theoretical analysis suggests that advanced LIGO may be able to detect gravitational wave memory–permanent distortion of spacetime due to nonlinear effects predicted by general relativity–when it operates at its design sensitivity.


[Phys. Rev. Lett. 117, 061102] Published Fri Aug 05, 2016

Microwave Realization of the Gaussian Symplectic Ensemble

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Author(s): A. Rehemanjiang, M. Allgaier, C. H. Joyner, S. Müller, M. Sieber, U. Kuhl, and H.-J. Stöckmann

A circuit of microwave cavities exhibiting chaotic dynamics and antiunitary symmetry is demonstrated. This is the first experimental observation of a Gaussian symplectic ensemble, one of the three classical matrix ensembles.


[Phys. Rev. Lett. 117, 064101] Published Fri Aug 05, 2016

Berry Phase in Lattice QCD

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Author(s): Arata YamamotoThe Berry phase of a single fermion wave function in two spatial dimensions is calculated using lattice field theory.[Phys. Rev. Lett. 117, 052001] Published Fri Jul 29, 2016

Violation of the Leggett-Garg Inequality in Neutrino Oscillations

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Author(s): J. A. Formaggio, D. I. Kaiser, M. M. Murskyj, and T. E. Weiss

An experiment similar to the Bell inequality test confirms that neutrino oscillation is a quantum physics effect that is incompatible with alternative classical models.


[Phys. Rev. Lett. 117, 050402] Published Tue Jul 26, 2016

Water Dielectric Effects in Planar Confinement

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Author(s): Alexander Schlaich, Ernst W. Knapp, and Roland R. NetzMolecular dynamics simulations indicate that the dielectric constant of water may dramatically change when the liquid is confined between two surfaces.[Phys. Rev. Lett. 117, 048001] Publi…

Perfect Quantum Cosmological Bounce

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Author(s): Steffen Gielen and Neil Turok

One theory for the formation of the universe replaces the singularity of the big bang with a smooth quantum “bounce”. This theory is extended to account for the passage of density variations and gravitational waves across the bounce.


[Phys. Rev. Lett. 117, 021301] Published Wed Jul 06, 2016