Physics and Astronomy

Simulating radiative magnetohydrodynamical flows with ASTROBEAR: implementation and applications of non-equilibrium cooling

Hansen, E.C.; Hartigan, P.; Frank, A.; Wright, A.; Raymond, J.C. (2018)

Radiative cooling plays a crucial role in the dynamics of many astrophysical flows, and is particularly important in the dense shocked gas within Herbig-Haro (HH) objects and stellar jets. Simulating cooling processes ...

Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70

Keppler, M.; Benisty, M.; Müller, A.; Henning, Th.; van Boekel, R.; Cantalloube, F.; Ginski, C.; van Holstein, R.G.; Maire, A.-L.; Pohl, A.; Samland, M.; Avenhaus, H.; Baudino, J.-L.; Boccaletti, A.; de Boer, J.; Bonnefoy, M.; Chauvin, G.; Desidera, S.; Langlois, M.; Lazzoni, C.; Marleau, G.-D.; Mordasini, C.; Pawellek, N.; Stolker, T.; Vigan, A.; Zurlo, A.; Birnstiel, T.; Brandner, W.; Feldt, M.; Flock, M.; Girard, J.; Gratton, R.; Hagelberg, J.; Isella, A.; Janson, M.; Juhasz, A.; Kemmer, J.; Kral, Q.; Lagrange, A.-M.; Launhardt, R.; Matter, A.; Ménard, F.; Milli, J.; Mollière, P.; Olofsson, J.; Pérez, L.; Pinilla, P.; Pinte, C.; Quanz, S.P.; Schmidt, T.; Udry, S.; Wahhaj, Z.; Williams, J.P.; Buenzli, E.; Cudel, M.; Dominik, C.; Galicher, R.; Kasper, M.; Lannier, J.; Mesa, D.; Mouillet, D.; Peretti, S.; Perrot, C.; Salter, G.; Sissa, E.; Wildi, F.; Abe, L.; Antichi, J.; Augereau, J.-C.; Baruffolo, A.; Baudoz, P.; Bazzon, A.; Beuzit, J.-L.; Blanchard, P.; Brems, S.S.; Buey, T.; De Caprio, V.; Carbillet, M.; Carle, M.; Cascone, E.; Cheetham, A.; Claudi, R.; Costille, A.; Delboulbé, A.; Dohlen, K.; Fantinel, D.; Feautrier, P.; Fusco, T.; Giro, E.; Gluck, L.; Gry, C.; Hubin, N.; Hugot, E.; Jaquet, M.; Le Mignant, D.; Llored, M.; Madec, F.; Magnard, Y.; Martinez, P.; Maurel, D.; Meyer, M.; Möller-Nilsson, O.; Moulin, T.; Mugnier, L.; Origné, A.; Pavlov, A.; Perret, D.; Petit, C.; Pragt, J.; Puget, P.; Rabou, P.; Ramos, J.; Rigal, F.; Rochat, S.; Roelfsema, R.; Rousset, G.; Roux, A.; Salasnich, B.; Sauvage, J.-F.; Sevin, A.; Soenke, C.; Stadler, E.; Suarez, M.; Turatto, M.; Weber, L. (2018)

Context. Young circumstellar disks are the birthplaces of planets. Their study is of prime interest to understand the physical and chemical conditions under which planet formation takes place. Only very few detections of ...

Unbound-to-bound transition of two-atom polaritons in an optical cavity

Sun, Qing; Hu, Jie; Wen, Lin; Pu, Han; Ji, An-Chun (2018)

We consider two spin-1/2 fermions inside an optical cavity which supports a single-mode quantized light field. We demonstrate that the atom-light coupling (ALC) gives rise to the two-atom polariton states, where the two ...

Measurement of the Dynamical Structure Factor of a 1D Interacting Fermi Gas

Yang, T.L.; Grišins, P.; Chang, Y.T.; Zhao, Z.H.; Shih, C.Y.; Giamarchi, T.; Hulet, R.G. (2018)

We present measurements of the dynamical structure factor S(q,ω) of an interacting one-dimensional Fermi gas for small excitation energies. We use the two lowest hyperfine levels of the 6Li atom to form a pseudospin-1/2 system ...

Raman scattering study of NaFe0.53Cu0.47As

Zhang, W.-L.; Song, Y.; Wang, W.-Y.; Cao, C.-D.; Dai, P.-C.; Jin, C.-Q.; Blumberg, G. (2018)

We use polarization-resolved Raman scattering to study lattice dynamics in NaFe0.53Cu0.47As single crystals. We identify four A1g phonon modes, at 126, 172, 183, and 197 cm−1, and four B3g phonon modes at 101, 139, 173, ...

Cooling fermions in an optical lattice by adiabatic demagnetization

Mirasola, Anthony E.; Wall, Michael L.; Hazzard, Kaden R.A. (2018)

The Fermi-Hubbard model describes ultracold fermions in an optical lattice and exhibits antiferromagnetic long-ranged order below the Néel temperature. However, reaching this temperature in the laboratory has remained an ...

Field-induced topological pair-density wave states in a multilayer optical lattice

Zheng, Zhen-Fei; Guo, Guang-Can; Pu, Han; Zou, Xu-Bo (2018)

We study the superfluid phases of a Fermi gas in a multilayer optical lattice system in the presence of out-of-plane Zeeman field, as well as spin-orbit (SO) coupling. We show that the Zeeman field combined with the SO ...

The physicist's guide to one of biotechnology's hottest new topics: CRISPR-Cas

Bonomo, Melia E.; Deem, Michael W. (2018)

Clustered regularly interspaced short palindromic repeats (CRISPR) and CRISPR-associated proteins (Cas) constitute a multi-functional, constantly evolving immune system in bacteria and archaea cells. A heritable, molecular ...

Molecular mechanisms of the interhead coordination by interhead tension in cytoplasmic dyneins

Wang, Qian; Jana, Biman; Diehl, Michael R.; Cheung, Margaret S.; Kolomeisky, Anatoly B.; Onuchic, José N. (2018)

Cytoplasmic dyneins play a major role in retrograde cellular transport by moving vesicles and organelles along microtubule filaments. Dyneins are multidomain motor proteins with two heads that coordinate their motion via ...

c-axis pressure-induced antiferromagnetic order in optimally P-doped BaFe2(As0.70P0.30)2 superconductor

Hu, Ding; Wang, Weiyi; Zhang, Wenliang; Wei, Yuan; Gong, Dongliang; Tam, David W.; Zhou, Panpan; Li, Yu; Tan, Guotai; Song, Yu; Georgii, Robert; Pedersen, Björn; Cao, Huibo; Tian, Wei; Roessli, Bertrand; Yin, Zhiping; Dai, Pengcheng (2018)

Superconductivity in BaFe2(As1−xPx)2 iron pnictides emerges when its in-plane two-dimensional (2D) orthorhombic lattice distortion associated with nematic phase at Ts and three-dimensional (3D) collinear antiferromagnetic ...

Local orthorhombic lattice distortions in the paramagnetic tetragonal phase of superconducting NaFe1−xNixAs

Wang, Weiyi; Song, Yu; Cao, Chongde; Tseng, Kuo-Feng; Keller, Thomas; Li, Yu; Harriger, L.W.; Tian, Wei; Chi, Songxue; Yu, Rong; Nevidomskyy, Andriy H.; Dai, Pengcheng (2018)

Understanding the interplay between nematicity, magnetism and superconductivity is pivotal for elucidating the physics of iron-based superconductors. Here we use neutron scattering to probe magnetic and nematic orders ...

Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1−xCox)2As2

Zhang, Rui; Wang, Weiyi; Maier, Thomas A.; Wang, Meng; Stone, Matthew B.; Chi, Songxue; Winn, Barry; Dai, Pengcheng (2018)

We use inelastic neutron scattering to study the energy and wave-vector dependence of the superconductivity-induced resonance in hole-doped Ba0.67K0.33(Fe1−xCox)2As2 (x=0 and 0.08 with Tc≈37 and 28 K, respectively). In ...

Efficient Monte Carlo simulation of a dissipative Ising chain

Butcher, Matthew W.; Pixley, J.H.; Nevidomskyy, Andriy H. (2018)

We numerically study the dissipative transverse field Ising model in a bosonic bath with Ohmic spectral density. We present Monte Carlo techniques for studying this model in previously inaccessible regimes of strong ...

A room-temperature mid-infrared photodetector for on-chip molecular vibrational spectroscopy

Zheng, Bob; Zhao, Hangqi; Cerjan, Ben; Yazdi, Sadegh; Ringe, Emilie; Nordlander, Peter; Halas, Naomi J. (2018)

Infrared (IR) photodetection is of major scientific and technical interest since virtually all molecules exhibit characteristic vibrational modes in the mid-infrared region of the spectrum, giving rise to molecular ...

Recent Developments in Our Knowledge of Inner Magnetosphere‐Ionosphere Convection

Kunduri, B.S.R.; Baker, J.B.H.; Ruohoniemi, J.M.; Sazykin, S.; Oksavik, K.; Maimaiti, M.; Chi, P.J.; Engebretson, M.J. (2018)

Plasma convection in the coupled inner magnetosphere‐ionosphere is influenced by different factors such as neutral winds, penetration electric fields, and polarization electric fields. Several crucial insights about the ...

Dissociative electron attachment studies with hyperthermal Rydberg atoms

Buathong, S.; Dunning, F.B. (2018)

Earlier studies of the velocity distributions of heavy-Rydberg ion-pair states formed in collisions between potassium Rydberg atoms with low-to-intermediate values of n, 10 ≲ n ≲ 15, and targets that attach free low-energy ...

Magnetospheric Multiscale Dayside Reconnection Electron Diffusion Region Events

Webster, J.M.; Burch, J.L.; Reiff, P.H.; Daou, A.G.; Genestreti, K.J.; Graham, D.B.; Torbert, R.B.; Ergun, R.E.; Sazykin, S.Y.; Marshall, A.; Allen, R.C.; Chen, L.-J.; Wang, S.; Phan, T.D.; Giles, B.L.; Moore, T.E.; Fuselier, S.A.; Cozzani, G.; Russell, C.T.; Eriksson, S.; Rager, A.C.; Broll, J.M.; Goodrich, K.; Wilder, F. (2018)

We use high‐resolution data from dayside passes of the Magnetospheric Multiscale (MMS) mission to create for the first time a comprehensive listing of encounters with the electron diffusion region (EDR), as evidenced by ...

Reduced electronic correlation effects in half substituted Ba(Fe1−xCox)2As2

Liu, Z.-H.; Yaresko, A.N.; Li, Y.; Evtushinsky, D.V.; Dai, P.-C.; Borisenko, S.V. (2018)

We report a comprehensive study of the tridimensional nature and orbital character of the low-energy electronic structure in 50% Cobalt doped Ba(Fe1−xCox)2As2 (d6.5), by using polarization- and photon energy-dependent ...

High-contrast imaging of HD 163296 with the Keck/NIRC2 L′-band vortex coronograph

Guidi, G.; Ruane, G.; Williams, J.P.; Mawet, D.; Testi, L.; Zurlo, A.; Absil, O.; Bottom, M.; Choquet, E.; Christiaens, V.; Castellá, B. Femenía; Huby, E.; Isella, A.; Kastner, J.; Meshkat, T.; Reggiani, M.; Riggs, A.; Serabyn, E.; Wallack, N. (2018)

We present observations of the nearby (D∼100 pc) Herbig star HD 163296 taken with the vortex coronograph at Keck/NIRC2 in the L′ band (3.7 μμm) to search for planetary mass companions in the ringed disc surrounding this ...

Analysis of Hierarchical Organization in Gene Expression Networks Reveals Underlying Principles of Collective Tumor Cell Dissemination and Metastatic Aggressiveness of Inflammatory Breast Cancer

Tripathi, Shubham; Jolly, Mohit Kumar; Woodward, Wendy A.; Levine, Herbert; Deem, Michael W. (2018)

Clusters of circulating tumor cells (CTCs), despite being rare, may account for more than 90% of metastases. Cells in these clusters do not undergo a complete epithelial-to-mesenchymal transition (EMT), but retain some ...