Recent Submissions

  • Phase separation, competition, and volume-fraction control in NaFe1−xCoxA 

    Ma, Long; Dai, J.; Wang, P.S.; Lu, R.; Song, Yu; Zhang, Chenglin; Tan, G.T.; Dai, Pengcheng; Hu, D.; Li, S.L.; Normand, B.; Yu, Weiqiang (2014)
    We report a detailed nuclear magnetic resonance (NMR) study by combined Na23 and As75 measurements over a broad range of doping to map the phase diagram of NaFe1−xCoxAs. In the underdoped regime (x≤0.017), we find a magnetic ...
  • Spin relaxation times of single-wall carbon nanotubes 

    Rice, W.D.; Weber, R.T.; Nikolaev, P.; Arepalli, S.; Berka, V.; Tsai, A.-L.; Kono, J. (2013)
    We have measured temperature (T)- and power-dependent electron spin resonance in bulk single-wall carbon nanotubes to determine both the spin-lattice and the spin-spin relaxation times, T1 and T2. We observe that T−11 ...
  • Two spatially separated phases in semiconducting Rb0.8Fe1.5S2 

    Wang, Meng; Tian, Wei; Valdivia, P.; Chi, Songxue; Bourret-Courchesne, E.; Dai, Pengcheng; Birgeneau, R. J. (2014)
    We report neutron scattering and transport measurements on semiconducting Rb0.8Fe1.5S2, a compound isostructural and isoelectronic to the well-studied A0.8FeySe2(A=K,Rb,Cs,Tl/K) superconducting systems. Both resistivity ...
  • Anisotropic neutron spin resonance in underdoped superconducting NaFe1−xCoxAs 

    Zhang, Chenglin; Song, Yu; Regnault, L.-P.; Su, Yixi; Enderle, M.; Kulda, J.; Tan, Guotai; Sims, Zachary C.; Egami, Takeshi; Si, Qimiao; Dai, Pengcheng (2014)
    We use polarized inelastic neutron scattering (INS) to study spin excitations in superconducting NaFe0.985Co0.015As (C15) with static antiferromagnetic (AF) order along the a axis of the orthorhombic structure and ...
  • Polyradical Character and Spin Frustration in Fullerene Molecules: An Ab Initio Non-Collinear Hartree–Fock Study 

    Jiménez-Hoyos, Carlos A.; Rodríguez-Guzmán, R.; Scuseria, Gustavo E. (2014)
    Most ab initio calculations on fullerene molecules have been carried out on the basis of the paradigm of the Hückel model. This is consistent with the restricted nature of the independent-particle model underlying such ...
  • Emergence of topological and strongly correlated ground states in trapped Rashba spin-orbit-coupled Bose gases 

    Ramachandhran, B.; Hu, Hui; Pu, Han (2013)
    We theoretically study an interacting few-body system of Rashba spin-orbit-coupled two-component Bose gases confined in a harmonic trapping potential. We solve the interacting Hamiltonian at large Rashba coupling strengths ...
  • Nanostructure investigations of nonlinear differential conductance in NdNiO3 thin films 

    Hardy, Will J.; Ji, Heng; Mikheev, Evgeny; Stemmer, Susanne; Natelson, Douglas (2014)
    Transport measurements on thin films of NdNiO3 reveal a crossover to a regime of pronounced nonlinear conduction below the well-known metal-insulator transition temperature. The evolution of the transport properties at ...
  • Controlling Condensate Collapse and Expansion with an Optical Feshbach Resonance 

    Yan, Mi; DeSalvo, B.J.; Ramachandhran, B.; Pu, H.; Killian, T.C. (2013)
    We demonstrate control of the collapse and expansion of an Sr88 Bose-Einstein condensate using an optical Feshbach resonance near the S01−P13 intercombination transition at 689 nm. Significant changes in dynamics are caused ...
  • Noise in electromigrated nanojunctions 

    Wheeler, P.J.; Chen, Ruoyu; Natelson, D. (2013)
    Noise measurements are a probe beyond simple electronic transport that can reveal additional information about electronic correlations and inelastic processes. Here we report noise measurements in individual electromigrated ...
  • Orbital-Selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K1−xFe2−ySe2 

    Yu, Rong; Si, Qimiao (2013)
    We study a multiorbital model for the alkaline iron selenides K1−xFe2−ySe2 using a slave-spin method. With or without ordered vacancies, we identify a metal-to-Mott-insulator transition at the commensurate filling of six ...
  • Field-induced long-range magnetic order in the spin-singlet ground-state system YbAl3C3: Neutron diffraction study 

    Khalyavin, D.D.; Adroja, D.T.; Manuel, P.; Daoud-Aladine, A.; Kosaka, M.; Kondo, K.; McEwen, K.A.; Pixley, J.H.; Si, Qimiao (2013)
    The 4f-electron system YbAl3C3 with a nonmagnetic spin-dimer ground state has been studied by neutron diffraction in an applied magnetic field. A long-range magnetic order involving both ferromagnetic and antiferromagnetic ...
  • Synthesis and Crystal Structure of Gold Nanobelts 

    Payne, Courtney M.; Tsentalovich, Dmitri E.; Benoit, Denise N.; Anderson, Lindsey J.E.; Guo, Wenhua; Colvin, Vicki L.; Pasquali, Matteo; Hafner, Jason H. (2014)
    Gold nanobelts were synthesized by the reduction of tetrachloroauric acid with ascorbic acid in the presence of the surfactants cetyltrimethylammonium bromide and sodium dodecylsulfate. The resulting structures have ...
  • Charge Transfer Plasmons: Optical Frequency Conductances and Tunable Infrared Resonances 

    Wen, Fangfang; Zhang, Yue; Gottheim, Samuel; King, Nicholas S.; Zhang, Yu; Nordlander, Peter; Halas, Naomi J. (2015)
    A charge transfer plasmon (CTP) appears when an optical-frequency conductive pathway between two metallic nanoparticles is established, enabling the transfer of charge between nanoparticles when the plasmon is excited. ...
  • Laser Pulse Duration Is Critical For the Generation of Plasmonic Nanobubbles 

    Lukianova-Hleb, Ekaterina Y.; Volkov, Alexey N.; Lapotko, Dmitri O. (2014)
    Plasmonic nanobubbles (PNBs) are transient vapor nanobubbles generated in liquid around laser-overheated plasmonic nanoparticles. Unlike plasmonic nanoparticles, PNBs’ properties are still largely unknown due to their ...
  • Defining and resolving current systems in geospace 

    Ganushkina, N.Y.; Liemohn, M.W.; Dubyagin, S.; Daglis, I.A.; Dandouras, I.; De Zeeuw, D.L.; Ebihara, Y.; Ilie, R.; Katus, R.; Kubyshkina, M.; Milan, S.E.; Ohtani, S.; Ostgaard, N.; Reistad, J.P.; Tenfjord, P.; Toffoletto, F.; Zaharia, S.; Amariutei, O. (2015)
    Electric currents flowing through near-Earth space (R≤12RE) can support a highly distorted magnetic field topology, changing particle drift paths and therefore having a nonlinear feedback on the currents themselves. A ...
  • High e+/e− Ratio Dense Pair Creation with 1021W.cm−2 Laser Irradiating Solid Targets 

    Liang, E.; Clarke, T.; Henderson, A.; Fu, W.; Lo, W.; Taylor, D.; Chaguine, P.; Zhou, S.; Hua, Y.; Cen, X.; Wang, X.; Kao, J.; Hasson, H.; Dyer, G.; Serratto, K.; Riley, N.; Donovan, M.; Ditmire, T. (2015)
    We report results of new pair creation experiments using ~100 Joule pulses of the Texas Petawatt Laser to irradiate solid gold and platinum targets, with intensities up to ~1.9 × 10(21) W.cm(-2) and pulse durations as short ...
  • Coupling the modules of EMT and stemness: A tunable ‘stemness window’ model 

    Jolly, Mohit Kumar; Jia, Dongya; Boareto, Marcelo; Mani, Sendurai A.; Pienta, Kenneth J.; Ben-Jacob, Eshel; Levine, Herbert (2015)
    Metastasis of carcinoma involves migration of tumor cells to distant organs and initiate secondary tumors. Migration requires a complete or partial Epithelial-to-Mesenchymal Transition (EMT), and tumor-initiation requires ...
  • Implications of the hybrid epithelial/mesenchymal phenotype in metastasis 

    Jolly, Mohit Kumar; Boareto, Marcelo; Huang, Bin; Jia, Dongya; Lu, Mingyang; Ben-Jacob, Eshel; Onuchic, José N.; Levine, Herbert (2015)
    Transitions between epithelial and mesenchymal phenotypes - the epithelial to -mesenchymal transition (EMT) and its reverse the mesenchymal to epithelial transition (MET) - are hallmarks of cancer metastasis. While ...
  • Longitudinal Spin Excitations and Magnetic Anisotropy in Antiferromagnetically Ordered BaFe2As2 

    Wang, Chong; Zhang, Rui; Wang, Fa; Luo, Huiqian; Regnault, L.P.; Dai, Pengcheng; Li, Yuan (2013)
    We report on a spin-polarized inelastic neutron-scattering study of spin waves in the antiferromagnetically ordered state of BaFe2As2. Three distinct excitation components are identified, with spins fluctuating along the ...
  • Quasispecies theory for evolution of modularity 

    Park, Jeong-Man; Niestemski, Liang Ren; Deem, Michael W. (2015)
    Biological systems are modular, and this modularity evolves over time and in different environments. A number of observations have been made of increased modularity in biological systems under increased environmental ...

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