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Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3
A. Crepaldi, B. Ressel, F. Cilento +7
We exploit time- and angle- resolved photoemission spectroscopy to determine the evolution of the out-of-equilibrium electronic structure of the topological insulator Bi2Se. The re…
Persistence of singlet fluctuations in the coupled spin tetrahedra system Cu2Te2O5Br2 revealed by high-field magnetization and 79Br NQR - 125Te NMR
S. -H. Baek, K. -Y. Choi, H. Berger +2
We present high-field magnetization and Br nuclear quadrupole resonance (NQR) and Te nuclear magnetic resonance (NMR) studies in the weakly coupled Cu ($S=1/2…
Temperature dependent infrared spectroscopy of the Rashba spin-splitting semiconductor BiTeI
C. Martin, K. H. Miller, S. Buvaev +4
We performed temperature dependent infrared spectroscopy measurements on BiTeI single crystals, which exhibit large Rashba spin-splitting. Similar to a previous optical study, we f…
Ultrafast dynamics of charge density waves in 4Hb-TaSe2 probed by femtosecond electron diffraction
N. Erasmus, M. Eichberger, K. Haupt +6
The dynamics of the photoinduced commensurate to incommensurate charge density wave (CDW) phase transition in 4Hb-TaSe2 are investigated by femtosecond electron diffraction. In the…
Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO3
I. Živković, D. M. Djokić, M. Herak +9
We present the investigation of a monoclinic compound SeCuO3 using x-ray powder diffraction, magnetization, torque and electron-spin-resonance (ESR). Structurally based analysis su…
Persistent spin dynamics intrinsic to amplitude-modulated long-range magnetic order
M. Pregelj, A. Zorko, O. Zaharko +4
An incommensurate elliptical helical magnetic structure in the frustrated coupled-spin-chain system FeTe2O5Br is surprisingly found to persist down to 53(3) mK (T/T_N ~ 1/200), acc…