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  • 101.
    Triola, Christopher
    et al.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Balatsky, Alexander V.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Los Alamos National Laboratory, USA; ETH Institute for Theoretical Studies (ETH-ITS), Switzerland.
    Pair symmetry conversion in driven multiband superconductors2017In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 22, article id 224518Article in journal (Refereed)
    Abstract [en]

    It was recently shown that odd-frequency superconducting pair amplitudes can be induced in conventional superconductors subjected to a spatially nonuniform time-dependent drive. It has also been shown that, in the presence of interband scattering, multiband superconductors will possess bulk odd-frequency superconducting pair amplitudes. In this work we build on these previous results to demonstrate that by subjecting a multiband superconductor with interband scattering to a time-dependent drive, even-frequency pair amplitudes can be converted to odd-frequency pair amplitudes and vice versa. We will discuss the physical conditions under which these pair symmetry conversions can be achieved and possible experimental signatures of their presence.

  • 102. Volckaert, Klara
    et al.
    Rostami, Habib
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Biswas, Deepnarayan
    Marković, Igor
    Andreatta, Federico
    Sanders, Charlotte E.
    Majchrzak, Paulina
    Cacho, Cephise
    Chapman, Richard T.
    Wyatt, Adam
    Springate, Emma
    Lizzit, Daniel
    Bignardi, Luca
    Lizzit, Silvano
    Mahatha, Sanjoy K.
    Bianchi, Marco
    Lanata, Nicola
    King, Phil D. C.
    Miwa, Jill A.
    Balatsky, Alexander
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Hofmann, Philip
    Ulstrup, Søren
    Momentum-resolved linear dichroism in bilayer MoS22019In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 24, article id 241406Article in journal (Refereed)
    Abstract [en]

    In solid state photoemission experiments it is possible to extract information about the symmetry and orbital character of the electronic wave functions via the photoemission selection rules that shape the measured intensity. This approach can be expanded in a pump-probe experiment where the intensity contains additional information about interband excitations induced by an ultrafast laser pulse with tunable polarization. Here, we find an unexpected strong linear dichroism effect (up to 42.4%) in the conduction band of bilayer MoS2, when measuring energy- and momentum-resolved snapshots of excited electrons by time- and angle-resolved photoemission spectroscopy. We model the polarization-dependent photoemission intensity in the transiently populated conduction band using the semiconductor Bloch equations. Our theoretical analysis reveals a strongly anisotropic momentum dependence of the optical excitations due to intralayer single-particle hopping, which explains the observed linear dichroism.

  • 103. Willa, Kristin
    et al.
    Willa, Roland
    Welp, Ulrich
    Fisher, Ian R.
    Rydh, Andreas
    Stockholm University, Faculty of Science, Department of Physics.
    Kwok, Wai-Kwong
    Islam, Zahir
    Phase transition preceding magnetic long-range order in the double perovskite Ba2NaOsO62019In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 4, article id 041108Article in journal (Refereed)
    Abstract [en]

    Recent theoretical studies [G. Chen et al., Phys. Rev. B 82, 174440 (2010); H. Ishizuka et al., Phys. Rev. B 90, 184422 (2014)] for the magnetic Mott insulator Ba2NaOsO6 have proposed a low-temperature order parameter that breaks lattice rotational symmetry without breaking time reversal symmetry, leading to a nematic phase just above the magnetic ordering temperature. We present high-resolution calorimetric and magnetization data of the same Ba2NaOsO6 single crystal and show evidence for a weakly field-dependent phase transition occurring at a temperature of T-s approximate to 9.5 K, above the magnetic ordering temperature of T-c approximate to 7.5 K. This transition appears as a broadened step in the low-field temperature dependence of the specific heat. The evolution of the phase boundary with applied magnetic field suggests that this phase coincides with the phase of broken local point symmetry seen in NMR experiments at high fields [L. Lu et al., Nat. Commun. 8, 14407 (2017)]. Furthermore, the magnetic field dependence of the specific heat provides clear indications for magnetic correlations persisting at temperatures between T-c and T-s where long-range magnetic order is absent, giving support for the existence of the proposed nematic phase.

  • 104.
    Zeinali, Arash
    et al.
    Stockholm University, Faculty of Science, Department of Physics.
    Golod, Taras
    Stockholm University, Faculty of Science, Department of Physics.
    Krasnov, Vladimir M.
    Stockholm University, Faculty of Science, Department of Physics.
    Surface superconductivity as the primary cause of broadening of superconducting transition in Nb films at high magnetic fields2016In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 21, article id 214506Article in journal (Refereed)
    Abstract [en]

    We study the origin of broadening of superconducting transition in sputtered Nb films at high magnetic fields. From simultaneous tunneling and transport measurements we conclude that the upper critical field H-c2 always corresponds to the bottom of transition R similar to 0, while the top R similar to R-n occurs close to the critical field for destruction of surface superconductivity H-c3 similar or equal to 1.7H(c2). The two-dimensional nature of superconductivity at H > H-c2 is confirmed by cusplike angular dependence of magnetoresistance. Our data indicates that surface superconductivity is remarkably robust even in disordered polycrystalline films and, surprisingly, even in perpendicular magnetic fields. We conclude that surface superconductivity, rather than flux-flow phenomenon, inhomogeneity, or superconducting fluctuations, is the primary cause of broadening of superconducting transition in magnetic field.

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