Charge transfer statistics in symmetric fractional edge-state Mach-Zehnder interferometer
V. V. Ponomarenko and D. V. Averin
We have studied the zero-temperature statistics of charge transfer between the two edges of quantum Hall liquids with filling factors nu=1/(2m+1) forming Mach-Zehnder interferometer. The known Bethe ansatz solution for symmetric interferometer is used to obtain the cumulant-generating function of ch ... [Phys. Rev. B 80, 201313 (2009)] published Fri Nov 20, 2009.
Finite-temperature dynamics with the density-matrix renormalization group method
J. Kokalj and P. Prelovsek
We present a numerical method for the evaluation of dynamical response functions at finite temperatures in one-dimensional strongly correlated systems. The approach is based on the density-matrix renormalization group method, combined with the finite-temperature Lanczos diagonalization. The feasibil ... [Phys. Rev. B 80, 205117 (2009)] published Fri Nov 20, 2009.
Two distinct ferroelectric phases in the multiferroic Y-type hexaferrite BaMgFeO
Hajime Sagayama, Kouji Taniguchi, Nobuyuki Abe, Taka-hisa Arima, Yusaku Nishikawa et al.
The magnetic phase diagram of the Y-type hexaferrite BaMgFeO has been studied using single-crystal neutron diffraction. The result indicates successive phase transitions where the magnetic modulation wave number changed discontinuously when a magnetic field is applied and the temperature is varied. ... [Phys. Rev. B 80, 180419 (2009)] published Fri Nov 20, 2009.
Transition from spin-density-wave to layered antiferromagnetic state induced by hydrogen as a test for the origin of spin-density waves in chromium
V. M. Uzdin, H. Zabel, A. Remhof, and B. Hjorvarsson
Neutron scattering experiments of Cr/V(001) superlattices are discussed, which show that the incommensurate spin-density-wave (SDW) in thick Cr layers becomes suppressed when the V spacer layers are loaded with hydrogen. The hydrogen loading triggers a transition from the incommensurate SDW state to ... [Phys. Rev. B 80, 174418 (2009)] published Fri Nov 20, 2009.
Terahertz photoresponse of a quantum Hall edge-channel diode
Christian Notthoff, Kevin Rachor, Detlef Heitmann, and Axel Lorke
The terahertz (THz) photoresponse of a two-dimensional electron gas in the quantum Hall regime is investigated. We use a sample structure which is topologically equivalent to a Corbino geometry combined with a cross-gate technique. This quasi-Corbino geometry allows us to directly investigate the TH ... [Phys. Rev. B 80, 205320 (2009)] published Thu Nov 19, 2009.
Spin-charge decoupling and the photoemission line-shape in one-dimensional insulators
Valeria Lante and Alberto Parola
The recent advances in angle-resolved photoemission techniques allowed the unambiguous experimental confirmation of spin-charge decoupling in quasi-one-dimensional (1D) Mott insulators. This opportunity stimulates a quantitative analysis of the spectral function A(k,omega) of prototypical one-dimens ... [Phys. Rev. B 80, 195113 (2009)] published Thu Nov 19, 2009.
Field dependence of the adiabatic temperature change in second order phase transition materials: Application to Gd
V. Franco, A. Conde, J. M. Romero-Enrique, Y. I. Spichkin, V. I. Zverev et al.
The field dependence of the adiabatic temperature change DeltaT of second order phase transition materials is studied, both theoretically and experimentally. Using scaling laws, it is demonstrated that, at the Curie temperature, the field dependence of DeltaT is characterized by H. Therefore, as the ... [J. Appl. Phys. 106, 103911 (2009)] published Thu Nov 19, 2009.
Field-Induced Orbital Antiferromagnetism in Mott Insulators
K. A. Al-Hassanieh, C. D. Batista, G. Ortiz, and L. N. Bulaevskii
We report on a new electromagnetic phenomenon that emerges in Mott insulators. The phenomenon manifests as antiferromagnetic ordering due to orbital electric currents which are spontaneously generated from the coupling between spin currents and an external homogenous magnetic field. This novel spin- ... [Phys. Rev. Lett. 103, 216402 (2009)] published Thu Nov 19, 2009.
Dirac electrons in a Kronig-Penney potential: Dispersion relation and transmission periodic in the strength of the barriers
M. Barbier, P. Vasilopoulos, and F. M. Peeters
The transmission T and conductance G through one or multiple one-dimensional, delta-function barriers of two-dimensional fermions with a linear energy spectrum are studied. T and G are periodic functions of the strength P of the delta-function barrier V(x,y)/[h-bar]v=Pdelta(x). The dispersion relati ... [Phys. Rev. B 80, 205415 (2009)] published Wed Nov 18, 2009.
Effects of repulsive and attractive ionized impurities on the resistivity of semiconductor heterostructures in the quantum Hall regime
A. Raymond, I. Bisotto, Y. M. Meziani, S. Bonifacie, C. Chaubet et al.
We have investigated experimentally and theoretically the effect of repulsive and attractive ionized impurities on the resistivity components (rho and rho) in the quantum Hall effect regime. GaAs/GaAlAs asymmetric modulation-doped quantum wells with additional delta doping (by Si donor atoms or Be a ... [Phys. Rev. B 80, 195316 (2009)] published Wed Nov 18, 2009.
Elastic constants of the single crystalline Yb based heavy-fermion compound YbCoZn
Yoshiki Nakanishi, Takuya Fujino, Kankichi Ito, Mitsuteru Nakamura, Masahito Yoshizawa et al.
Ultrasonic measurements have been carried out on the heavy-fermion compound YbCoZn to investigate the elastic properties and the 4f electric state of Yb ion. A strong temperature dependence at low temperature was found in elastic constants C, (CC)/2, and C of YbCoZn. Furthermore, the elastic constan ... [Phys. Rev. B 80, 184418 (2009)] published Wed Nov 18, 2009.
Anisotropy of the spin density wave onset for (TMTSF)PF in a magnetic field
Ya. A. Gerasimenko, V. A. Prudkoglyad, A. V. Kornilov, V. M. Pudalov, V. N. Zverev et al.
In order to study the spin density wave transition temperature (T) in (TMTSF)PF as a function of magnetic field, we measured the magnetoresistance R in fields up to 19 T. Measurements were performed for three field orientations B||a,b and c at ambient pressure and at P=5 kbar, that is nearly the cr ... [Phys. Rev. B 80, 184417 (2009)] published Wed Nov 18, 2009.
Bilayer quantum Hall system at nu=1: Pseudospin models and in-plane magnetic field
O. Tieleman, A. Lazarides, D. Makogon, and C. Morais Smith
We investigate two theoretical pseudomagnon-based models for a bilayer quantum Hall system (BQHS) at total filling factor nu=1. We find a unifying framework which elucidates the different approximations that are made. We also consider the effect of an in-plane magnetic field in BQHSs at nu=1, by der ... [Phys. Rev. B 80, 205315 (2009)] published Tue Nov 17, 2009.
Local density of states of electron-crystal phases in graphene in the quantum Hall regime
O. Poplavskyy, M. O. Goerbig, and C. Morais Smith
We calculate, within a self-consistent Hartree-Fock approximation, the local density of states for different electron crystals in graphene subject to a strong magnetic field. We investigate both the Wigner crystal and bubble crystals with M electrons per lattice site. The total density of states con ... [Phys. Rev. B 80, 195414 (2009)] published Tue Nov 17, 2009.
Magnetostructural transition in GdSbGe
A. S. Chernyshov, Ya. Mudryk, D. Paudyal, V. K. Pecharsky, K. A. Gschneidner, Jr. et al.
Magnetic and crystallographic properties of GdSbGe were investigated using dc magnetization, ac magnetic susceptibility, and heat capacity of an oriented single crystal, combined with temperature and magnetic field dependent x-ray powder diffraction. The compound undergoes an unusual magnetostructur ... [Phys. Rev. B 80, 184416 (2009)] published Tue Nov 17, 2009.
Magnetic transitions in alpha-FeO nanowires
C. Diaz-Guerra, L. Perez, J. Piqueras, and M. F. Chioncel
Magnetic transitions in single-crystal alpha-FeO (hematite) nanowires, grown by thermal oxidation of iron powder, have been studied in the range of 51023 K with a superconducting quantum interference device below room temperature and with a vibrating sample magnetometer at higher temperatures. The ... [J. Appl. Phys. 106, 104302 (2009)] published Tue Nov 17, 2009.
Spin Conservation and Fermi Liquid near a Ferromagnetic Quantum Critical Point
Andrey V. Chubukov and Dmitrii L. Maslov
We propose a new low-energy theory for itinerant fermions near a ferromagnetic quantum critical point. We show that the full low-energy model includes, in addition to conventional interaction via spin fluctuations, another type of interaction, whose presence is crucial for the theory to satisfy SU(2 ... [Phys. Rev. Lett. 103, 216401 (2009)] published Tue Nov 17, 2009.
Element-specific magnetometry of EuS nanocrystals
Rachel S. Selinsky, David J. Keavney, Matthew J. Bierman, and Song Jin
A soft x-ray absorption and x-ray magnetic circular dichroism (XMCD) study of the ferromagnetism in solution-grown EuS nanocrystals (NCs) is reported. The absorption edges of Eu M and M, S K, O K, and P K were probed to determine elementally specific contributions to the magnetism of EuS NCs. Differ ... [Appl. Phys. Lett. 95, 202501 (2009)] published Mon Nov 16, 2009.
Determination of perpendicular magnetic anisotropy in ultrathin ferromagnetic films by extraordinary Hall voltage measurement
Kyoung-Woong Moon, Jae-Chul Lee, Sug-Bong Choe, and Kyung-Ho Shin
A magnetometric technique for detecting the magnetic anisotropy field of ferromagnetic films is described. The technique is based on the extraordinary Hall voltage measurement with rotating the film under an external magnetic field. By analyzing the angle-dependent Hall voltage based on the StonerWo ... [Rev. Sci. Instrum. 80, 113904 (2009)] published Mon Nov 16, 2009.
Nanocrystalline metastable 2/17 and 1/12 precursors: A promising class of hard magnetic materials
L. Bessais, C. Djega-Mariadassou, H. Lassri, and N. Mliki
We present a general structure model relative to the metastable P6/mmm precursors of the I4/mmm RFeTi (R=Pr,Sm) and R[overline 3]m Sm(Fe,M) (M=Ga,Si) equilibrium phases. This model is based on the description of the binary RM compounds (s=vacancy rate, M=metal). The Rietveld analysis leads to stoi ... [J. Appl. Phys. 106, 103904 (2009)] published Mon Nov 16, 2009.
Nonlinear transport theory for negative-differential resistance states of two-dimensional electron systems in strong magnetic fields
A. Kunold and M. Torres
We present a model to describe the nonlinear response to a direct dc current applied to a two-dimensional electron system in a strong magnetic field. The model is based on the solution of the von Neumann equation incorporating the exact dynamics of two-dimensional damped electrons in the presence of ... [Phys. Rev. B 80, 205314 (2009)] published Fri Nov 13, 2009.
Muon spin relaxation studies of the frustrated quasi-two-dimensional square-lattice spin system Cu(Cl,Br)La(Nb,Ta)O: Evolution from spin-gap to antiferromagnetic state
Y. J. Uemura, A. A. Aczel, Y. Ajiro, J. P. Carlo, T. Goko et al.
We report muon spin relaxation ([mu]SR) and magnetic-susceptibility measurements on Cu(Cl,Br)La(Nb,Ta)O, which demonstrate: (a) the absence of static magnetism in (CuCl)LaNbO down to 15 mK confirming a spin-gapped ground state; (b) phase separation between partial volumes with a spin-gap and static ... [Phys. Rev. B 80, 174408 (2009)] published Fri Nov 13, 2009.
Prediction of electrically induced magnetic reconstruction at the manganite/ferroelectric interface
J. D. Burton and E. Y. Tsymbal
The control of magnetization via the application of an electric field, known as magnetoelectric coupling, is among the most fascinating and active research areas today. In addition to fundamental scientific interest, magnetoelectric effects may lead to new device concepts for data storage and proces ... [Phys. Rev. B 80, 174406 (2009)] published Fri Nov 13, 2009.
Quantum phase transition in (CuCl)La(NbTa)O
A. Kitada, Y. Tsujimoto, H. Kageyama, Y. Ajiro, M. Nishi et al.
We demonstrate the synthesis and magnetic properties of a quasi-two-dimensional frustrated quantum spin system (CuCl)La(NbTa)O. We observed persistence of the spin-singlet state in (CuCl)LaNbO up to x~0.4, accompanied by a slight reduction in the spin gap with increasing x. In spite of unaltered cel ... [Phys. Rev. B 80, 174409 (2009)] published Fri Nov 13, 2009.
Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe and FeTe: Electron Correlation and Covalency. (arXiv:0911.3705v1 [cond-mat.supr-con])
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Unconventional Superconductivity in the Novel Layered Superconductor Fe(Te-Se) Investigated by $^{125}$Te NMR on the Single Crystal. (arXiv:0911.3729v1 [cond-mat.supr-con])
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Optical properties of UO2 and PuO2. (arXiv:0911.3733v1 [cond-mat.str-el])
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Magnetic impurity resonance states and symmetry of the superconducting order parameter in iron-based superconductors. (arXiv:0911.3738v1 [cond-mat.supr-con])
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Mesoscopics and the High $T_c$ Problem. (arXiv:0911.3695v1 [cond-mat.supr-con])
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Quantum Phase Transitions in Alternating-Bond Mixed Diamond Chains with Spins 1 and 1/2. (arXiv:0911.3838v1 [cond-mat.str-el])
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Origin of Low-Energy Excitations in Charge-Ordered Manganites. (arXiv:0911.3858v1 [cond-mat.str-el])
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Heavy fermion material: Ce versus Yb case. (arXiv:0910.3110v2 [cond-mat.str-el] UPDATED)
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Electric-Field Modulation of Thermopower for the KTaO3 Field Effect Transistors. (arXiv:0910.3753v2 [cond-mat.str-el] UPDATED)
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Holographic dual of Cold Trapped Fermions. (arXiv:0907.1434v5 [hep-th] UPDATED)
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Dielectric Breakdown in a Mott Insulator: Many-body Schwinger-Landau-Zener Mechanism studied with a Generalized Bethe Ansatz. (arXiv:0903.2707v3 [cond-mat.stat-mech] UPDATED)
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Mott transitions in ternary flavor mixtures of ultracold fermions on optical lattices. (arXiv:0904.4610v3 [cond-mat.quant-gas] UPDATED)
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Magnetic field induced chiral particle-hole condensates. (arXiv:0905.3231v3 [cond-mat.str-el] UPDATED)
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Supersymmetry breaking as a quantum phase transition. (arXiv:0906.5492v2 [hep-th] UPDATED)
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Chirality Induced Tilted-Hill Giant Nernst Signal. (arXiv:0911.2512v2 [cond-mat.str-el] UPDATED)
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On one ansatz for sl_2-invariant R-matrices. (arXiv:math/0609519v1 [math.QA] CROSS LISTED)
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