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This study investigates methods for controlling the physical properties of the intrinsic magnetic topological insulator MnBi$_2$Te$_4$ (MBT) by substituting Mn with Pb in Mn$_{1-x}$Pb$_x$Bi$_2$Te$_4$ (MPBT) solid solutions. This…

We investigate in this paper properties of the spin resistivity in the magnetic semiconducting MnTe of NiAs structure. MnTe is a crossroad semiconductor with a large band gap. It is an antiferromagnet with the N\'eel temperature around…

材料科学 · 物理学 2015-06-03 Yann Magnin , Hung The Diep

The strain effect on electronic structure and thermoelectric properties of Higher Manganese Silicides (HMSs) Mn4Si7 was studied using Density Functional Theory (DFT) and through solving Boltzman Transport Equation (BTE). We found that the…

材料科学 · 物理学 2016-09-21 Do Duc Cuong , JinSik Park , S. H. Rhim , Soon Cheol Hong

Here we demonstrate that MnTe epitaxial films with zinc-blend structure and MnTe/ZnTe multilayers should show ferroelectric polarization in antiferromagnetically (AFM) ordered state and thus belong to multiferroics. Spontaneous…

材料科学 · 物理学 2008-11-14 Helen V. Gomonay , Ievgeniia G. Korniienko

By means of neutron inelastic scattering, magnetic excitations and phonons were measured for a single crystal of slightly overdoped superconductor Ca10Pt4As8(Fe1-xPtxAs)10 (x ~ 0.2) with the transition temperature Tc of ~33 K. Below Tc,…

Two-dimensional (2D) metallic systems with intrinsically low lattice thermal conductivity are rare, yet they are of great interest for next-generation energy and electronic technologies. Here, we present a comprehensive first-principles…

Edge states in narrow quasi two-dimensional nanostructures determine, to a large extent, their electric, thermoelectric and magnetic properties. Non-magnetic edge states may quite often lead to topological insulator type behavior. However…

介观与纳米尺度物理 · 物理学 2017-10-31 Stefan Krompiewski , Gianaurelio Cuniberti

The frequency-dependent conductivity is studied for both the one-dimensional Hubbard model and a model of spinless fermions, using a selection rule, the Bethe ansatz energy eigenstates, and conformal invariance. For densities where the…

凝聚态物理 · 物理学 2007-05-23 J. M. P. Carmelo , P. D. Sacramento , N. M. R. Peres , D. Baeriswyl

Terahertz (THz) radiation with its spectrum extending up to 1 THz has been observed by an illumination of femtosecond optical pulses to optical switching devices fabricated on magnetoresistive manganite thin films;…

强关联电子 · 物理学 2009-10-31 N. Kida , M. Tonouchi

Temperature (5--250 K) and magnetic field (0--70 kOe) variations of the low-energy (1--10 meV) electrodynamics of spin excitations have been investigated for a complete set of light-polarization configurations for a ferroelectric magnet…

材料科学 · 物理学 2009-11-13 N. Kida , Y. Ikebe , Y. Takahashi , J. P. He , Y. Kaneko , Y. Yamasaki , R. Shimano , T. Arima , N. Nagaosa , Y. Tokura

We investigate the generation and temperature-induced evolution of optically-driven spin photocurrents in WTe$_2$ and MoTe$_2$. By correlating the scattering-plane dependence of the spin photocurrents with the symmetry analysis, we find…

材料科学 · 物理学 2018-09-19 Sejoon Lim , Catherine R. Rajamathi , Vicky Süß , Claudia Felser , Aharon Kapitulnik

Exfoliated magnetic 2D materials enable versatile tuning of magnetization, e.g., by gating or providing proximity-induced exchange interaction. However, their electronic band structure after exfoliation has not been probed, most likely due…

We investigate the thermodynamic, magnetic, and electrical transport properties of a triangular-lattice antiferromagnet EuZnGe using single crystals grown from Eu-Zn flux in sealed tantalum tubes. Magnetic properties are found to be…

强关联电子 · 物理学 2022-09-23 Takashi Kurumaji , Masaki Gen , Shunsuke Kitou , Hajime Sagayama , Akihiko Ikeda , Taka-hisa Arima

We theoretically investigate the thermoelectric properties of a spin-polarized two-dimensional electron gas hosting a Kondo adatom hybridized with an STM tip. Such a setup is treated within the single-impurity Anderson model in combination…

强关联电子 · 物理学 2014-11-25 A. C. Seridonio , E. C. Siqueira , R. Franco , J. Silva-Valencia , I. A. Shelykh , M. S. Figueira

The photoluminescence spectra of band-edge transitions in GaN is studied as a function of temperature. The parameters that describe the temperature dependence red-shift of the band-edge transition energy and the broadening of emission line…

材料科学 · 物理学 2009-11-11 Niladri Sarkar , Subhasis Ghosh

The temperature dependence of the in-plane optical conductivity has been determined for Fe$_{1.03}$Te above and below the magnetic and structural transition at $T_N\simeq 68$ K. The electron and hole pockets are treated as two separate…

强关联电子 · 物理学 2014-10-08 Y. M. Dai , A. Akrap , J. Schneeloch , R. D. Zhong , T. S. Liu , G. D. Gu , Q. Li , C. C. Homes

The angular and temperature dependences of single crystal ESR spectra at X-band frequency of quasi 1D spin 1/2 antiferromagnetic zigzag chain system {\beta}-TeVO4 are reported. Two resonance components in the ESR spectrum have been…

强关联电子 · 物理学 2013-11-25 Yu. Savina , A. Bludov , V. Pashchenko , S. Gnatchenko , A. Stepanov , P. Lemmens

Magneto-structural phase transition in FeRh epitaxial layers was studied optically. It is shown that the transition between the low-temperature antiferromagnetic phase and the high-temperature ferromagnetic phase is accompanied by a rather…

材料科学 · 物理学 2016-08-31 V. Saidl , M. Brajer , L. Horak , H. Reichlova , K. Vyborny , M. Veis , T. Janda , F. Trojanek , I. Fina , X. Marti , T. Jungwirth , P. Nemec

Neutron powder diffraction studies of the crystal and magnetic structures of the magnetocaloric compound Mn1.1Fe0.9(P0.8Ge0.2) have been carried out as a function of temperature, applied magnetic field, and pressure. The data reveal that…

材料科学 · 物理学 2009-11-30 D. M. Liu , Q. Huang , M. Yue , J. W. Lynn , L. J. Liu , Y. Chen , Z. H. Wu , J. X. Zhang

We present the electrodynamic response of TiOBr, which undergoes a transition to a spin-singlet ground state for temperatures below T$_{C1}=28$ K. The temperature evolution of the phonon anomalies indicates, like in \cl, an extended…

材料科学 · 物理学 2009-11-10 G. Caimi , L. Degiorgi , P. Lemmens , F. C. Chou
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