CINXE.COM

<html class="no-js" lang="en"><head><script>(function(w,d,s,l,i){ w[l]=w[l]||[]; w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'}); var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:''; j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl; f.parentNode.insertBefore(j,f); }) (window,document,'script','dataLayer','GTM-PNZNVC2P');</script><meta charset="utf-8" /><meta content="width=device-width, initial-scale=1.0" name="viewport" /><title>Contact Us</title><link href="//fonts.googleapis.com/css?family=Source+Sans+Pro:400,600,400italic,600italic" rel="stylesheet" type="text/css" /><link href="//cdn.journals.aps.org/development/physics/stylesheets/app-c2fe3b58.css" rel="stylesheet" type="text/css" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon.png" rel="apple-touch-icon" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon-72x72.png" rel="apple-touch-icon" sizes="72x72" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon-76x76.png" rel="apple-touch-icon" sizes="76x76" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon-114x114.png" rel="apple-touch-icon" sizes="114x114" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon-120x120.png" rel="apple-touch-icon" sizes="120x120" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon-144x144.png" rel="apple-touch-icon" sizes="144x144" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon-152x152.png" rel="apple-touch-icon" sizes="152x152" /><link href="//cdn.journals.aps.org/development/physics/images/icons/apple-touch-icon-180x180.png" rel="apple-touch-icon" sizes="180x180" /><link href="//cdn.journals.aps.org/development/physics/images/icons/favicon.ico" rel="icon" type="image/vnd.microsoft.icon" /><meta content="//cdn.journals.aps.org/development/physics/images/icons/mstile-144x144.png" name="msapplication-TileImage" /><script>(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-3894348-16', 'auto'); ga('send', 'pageview');</script><meta content="authenticity_token" name="csrf-param" /><meta content="l32qpYdm1uOBUXm0btI12VYPsi6_46bRpAvtQ5gqjkw=" name="csrf-token" /></head><body><noscript><iframe><src>https://www.googletagmanager.com/ns.html?id=GTM-PNZNVC2P</src><height>0</height><width>0</width><style>display:none;visibility:hidden</style></iframe></noscript><nav class="aps-header top-bar" data-topbar=""><ul class="title-area"><li class="name"><a href="http://www.aps.org/" target="_self"><img alt="APS Logo" class="aps-logo" src="//cdn.journals.aps.org/development/physics/images/aps-logo.png" style="width: 45px;" /></a></li></ul><div class="top-bar-section"><ul class="left"><li class="has-dropdown"><a href="https://journals.aps.org"> Journals</a><ul class="dropdown"><li><a href="https://journals.aps.org/prl/">Physical Review Letters</a></li><li><a href="https://journals.aps.org/prx/">Physical Review X</a></li><li><a href="https://journals.aps.org/prxenergy/">PRX Energy</a></li><li><a href="https://journals.aps.org/prxquantum/">PRX Quantum</a></li><li><a href="https://journals.aps.org/rmp/">Reviews of Modern Physics</a></li><li><a href="https://journals.aps.org/pra/">Physical Review A</a></li><li><a href="https://journals.aps.org/prb/">Physical Review B</a></li><li><a href="https://journals.aps.org/prc/">Physical Review C</a></li><li><a href="https://journals.aps.org/prd/">Physical Review D</a></li><li><a href="https://journals.aps.org/pre/">Physical Review E</a></li><li><a href="https://journals.aps.org/prresearch/">Physical Review Research</a></li><li><a href="https://journals.aps.org/prab/">Physical Review Accelerators and Beams</a></li><li><a href="https://journals.aps.org/prapplied/">Physical Review Applied</a></li><li><a href="https://journals.aps.org/prfluids/">Physical Review Fluids</a></li><li><a href="https://journals.aps.org/prmaterials/">Physical Review Materials</a></li><li><a href="https://journals.aps.org/prper/">Physical Review Physics Education Research</a></li><li><a href="https://journals.aps.org/archive/">Physical Review</a></li><li><a href="https://journals.aps.org/archive/">Physical Review (Series I)</a></li></ul></li><li><a href="/" target="_self"> Physics Magazine</a></li><li><a href="http://www.aps.org/publications/apsnews/"> APS News</a></li></ul><ul class="right"></ul></div></nav><header class="header"><div class="column-row"><a href="/" target="_self"><img alt="APS Physics" class="header-logo" src="//cdn.journals.aps.org/development/physics/images/logo.png" /></a><ul class="header-nav"><li><a href="/about" target="_self">About</a></li><li><a href="/browse/" target="_self">Browse</a></li><li><a href="https://journals.aps.org/press" target="_self">Press</a></li><li><a href="/collections" target="_self">Collections</a></li></ul><form action="/browse/" method="GET" style="display: inline"><input class="header-search" name="q" placeholder="Search articles" type="search" value="" /></form><div class="header-dropdown"><a aria-controls="searchDropdown" aria-expanded="false" data-dropdown="searchDropdown"><img alt="Search" src="//cdn.journals.aps.org/development/physics/images/icon-search-white.svg" /></a><div aria-hidden="true" class="medium f-dropdown content" data-dropdown-content="" id="searchDropdown" tabindex="-1"><form action="/browse/" method="get"><input name="q" placeholder="Search articles" type="search" value="" /></form></div></div></div></header><div class="mobile-nav"><div class="mobile-nav-apslogo"><a href="http://aps.org"><img src="//cdn.journals.aps.org/development/physics/images/aps-logo.png" /></a></div><div class="mobile-nav-physicslogo"><a href="/" target="_self"><img src="//cdn.journals.aps.org/development/physics/images/logo-dark.png" /></a><a class="mobile-nav-dropdown" data-menu="apsMenu"></a></div><div class="mobile-nav-menuicon" data-menu="physicsMenu"><img src="//cdn.journals.aps.org/development/physics/images/icon-menu.svg" /></div><ul class="mobile-menu" id="physicsMenu"><li><a href="/" target="_self"> Home</a></li><li><a href="/about" target="_self"> About</a></li><li><a href="/browse/" target="_self"> Browse</a></li><li><a href="https://journals.aps.org/press" target="_self"> Press</a></li><li class="mobile-menu-search"><form action="/browse/" method="get"><input name="q" placeholder="Search for an article" type="search" value="" /></form></li></ul><ul class="mobile-menu" id="apsMenu"><li><a href="https://journals.aps.org"> APS Journals</a></li><li><a href="http://www.aps.org/publications/apsnews/"> APS News</a></li></ul></div><div class="main-narrow"><h1 id="contact-us">Contact Us</h1> <p>For general questions directed at the <i>Physics</i> staff: <a href="mailto:physics@aps.org">physics@aps.org</a><br /> For questions about the Tip Sheet for journalists: <a href="mailto:press@aps.org">press@aps.org</a><br /> To request permission to use an image: <a href="mailto:physics@aps.org">physics@aps.org</a></p> <div style="min-height: 10em;"></div> </div><div class="email-callout"><section class="column-row"><p>Sign up to receive weekly email alerts from <i>Physics Magazine</i>.</p><a class="small button" href="https://info.aps.org/physics-magazine"> Sign Up</a></section></div><script>window.apsMathJaxConfig = "https:";</script><footer><div class="upper-footer"><div class="column-row"><ul class="inline-list"><li><a href="http://www.aps.org"> APS</a></li><li><a href="/announcements" target="_self"> News and Announcements</a></li><li><a href="http://www.aps.org/membership/join.cfm"> Join APS</a></li><li><a href="/contact">Contact Us</a></li></ul></div></div><div class="lower-footer"><div class="column-row"><ul class="link-columns"><li><ul class="link-column"><li class="title">APS Journals</li><li><a href="https://journals.aps.org/about">About</a></li><li><a href="https://journals.aps.org/authors">Authors</a></li><li><a href="https://journals.aps.org/referees">Referees</a></li><li><a href="https://librarians.aps.org/institutional.html"> Subscriptions</a></li></ul></li><li><ul class="link-column"><li class="title">Students</li><li><a href="https://physics.aps.org/"> Physics</a></li><li><a href="http://www.physicscentral.com/"> PhysicsCentral</a></li><li><a href="http://www.aps.org/membership/student.cfm"> Student Membership</a></li></ul></li><li><ul class="link-column"><li class="title">APS Members</li><li><a href="http://www.aps.org/membership/aps-publications.cfm"> Subscriptions</a></li><li><a href="http://www.aps.org/memb/"> Membership</a></li><li><a href="http://www.aps.org/membership/faq.cfm"> FAQ</a></li><li><a href="http://www.aps.org/publications/apsnews/index.cfm"> APS News</a></li><li><a href="http://www.aps.org/meetings/index.cfm"> Meetings & Events</a></li></ul></li></ul><hr /><ul class="inline-list"><li><a href="http://www.aps.org/about/privacy.cfm"> Privacy</a></li><li><a href="https://journals.aps.org/policies"> Policies</a></li><li><a href="https://journals.aps.org/contact.html"> Contact Information</a></li><li><a href="mailto:feedback@aps.org"> Feedback</a></li></ul><p>Use of the American Physical Society websites and journals implies that the user has read and agrees to our <a href="https://journals.aps.org/info/terms.html"> Terms and Conditions</a> and any applicable Subscription Agreement.</p></div></div></footer><script src="https://cdn.aps.org/cookie-widget/latest/cookiewidget.js"></script><script src="https://cdn.journals.aps.org/libs/mathjax/2.7.2/MathJax.js?config=TeX-AMS-MML_HTMLorMML,https:"></script><script src="//cdn.journals.aps.org/development/physics/javascripts/app-2a772ad2.js" type="text/javascript"></script><script src="//cdn.journals.aps.org/development/physics/javascripts/citing_articles-e1848dc6.js" type="text/javascript"></script><script src="//cdn.journals.aps.org/development/physics/javascripts/sharing-ac57fdad.js" type="text/javascript"></script></body></html>