\documentclass[%
reprint,
superscriptaddress,
%preprint,
nofootinbib,
nobibnotes,
 amsmath,amssymb,
 aps,
%pra,
%prb,
prl,
%rmp,
%floatfix,
11pt,
]{revtex4-1}

\usepackage{graphicx}% Include figure files
\usepackage{dcolumn}% Align table columns on decimal point
\usepackage{bm}% bold math

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{iftex}
\ifPDFTeX
   \usepackage[utf8]{inputenc}
   \usepackage[T1]{fontenc}
   \usepackage{lmodern}
\else
   \ifXeTeX
     \usepackage{xltxtra}
   \else
     \usepackage{luatextra}
   \fi
   %\setmainfont[Ligatures=TeX]{Linux Libertine O}
   %\setmainfont[Ligatures=TeX]{Arial Unicode MS}
   \setmainfont{FreeSerif}
   \setmonofont{FreeMono}
   \usepackage{polyglossia}
\fi

\usepackage[paperwidth=170mm, paperheight=140mm, margin=20mm]{geometry}
%\usepackage{etoolbox}
\linespread{1.1}%line spacing
\usepackage{setspace}
%\usepackage{caption}
\usepackage{float}

\makeatletter
\def\frontmatter@abstractwidth{370\p@}
%\def\frontmatter@title@above{\addvspace{1pt}}
\def\frontmatter@title@below{} %\addvspace{-10pt}}
%\def\frontmatter@above@affilgroup{\addvspace{-11pt}}
\def\frontmatter@preabstractspace{6\p@}
\def\frontmatter@postabstractspace{3.5\p@}
\def\frontmatter@authorformat{\centering\normalsize\addvspace{1.5\p@}}%
%%\def\frontmatter@authorformat{\centering\advance\baselineskip\p@\parskip0.1\p@\let\thanks\thanks@latex\let\and\and@space}%
%\def\frontmatter@authorbelow{\vskip -12pt}%
\def\frontmatter@abstractfont{\small\parindent0em\relax\adjust@abstractwidth}%
\makeatother

\begin{document}
\title{Lifetime of terahertz magnons in ultrathin ferromagnets: Temperature effects }
\author{Khalil Zakeri}
\affiliation{Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany}
\affiliation{Max-Planck Institute of Microstructure Physics, Halle, Germany }
\begin{abstract}
Utilizing spin-polarized high resolution electron energy loss spectroscopy we investigate the ultrafast terahertz magnons, excited in an ultrathin ferromagnet. We demonstrate that the engineering of the electronic structure of a ferromagnetic metal, by reducing its dimensionality and changing its chemical composition, opens a possibility to strongly suppress the relaxation channels of terahertz magnons and thereby enhance the magnons’ lifetime. For the first time, we report on the long-living terahertz magnons excited in ultrathin metallic alloy films and explain the microscopic nature of this long lifetime [1]. 
We further monitor the terahertz magnons as a function of temperature and across the magnetic transition temperature $T_C$. We demonstrate that although at $T_C$ these excitations are affected by different damping mechanisms, they still behave as well-defined collective excitations [2].



\textbf{References:}
\begin{spacing}{0.8}

{\scriptsize[1] H.J. Qin, Kh. Zakeri, A. Ernst, L. M. Sandratskii, P. Buczek, A. Marmodoro, T.-H. Chuang, Y. Zhang and J. Kirschner, Nature Communications, 6, 6126 (2015)}

{\scriptsize[2] H.J. Qin, Kh. Zakeri, A. Ernst and J. Kirschner, Phys. Rev. Lett, accepted, arXiv:1702.06104. }
\end{spacing}

\end{abstract}
\maketitle

\end{document}
