冰球突破
北京凝聚态物理国家研究中心
SF10组供稿
第100期
2020年12月10日
发现二维金属中奇异的等离激元

冰球突破  guangzhaoshezaiguticailiaoshanghuishiqizhongdedianzixingchengliangleijifa:yizhongshidianzi-kongxuededuijifa,chengweijizi;lingyizhongshidianzidejitizhendang,chengweidenglijiyuan。denglijiyuanyouhenduoqitedeyingyong,lirudenglijiyuantongguoyuguangouhexingchengtu1suoshidejihuajiyuan (surface plasmon polariton, spp),zaidianluzhongjinxingnenglianghexinhaodechuanshu。lixiangqingkuangxia,denglijiyuanyouzheyiyujifabingqiebuyishuaijiandetexing。zaichuantongcailiaobirujin、yindengjinshuzhong,youyuqiangliedelangdaozunixiaoyinghedenglijiyuanyushengzisanshezuoyong,denglijiyuanyouzhejididekongjianxianyuxingyujigaodechuanbosunshilv。zheixiewentishidedenglijiyuanzaidianzixinxi、cuihuanengyuanyijishengwujishudengfangmiandeyingyongdoushoudaoxianzhi。yinci,zhibeihefaxianxingnengyouyideliangzicailiao,shiqijuyoulianghaodedenglijiyuantexingchengweicailiaoyingyonglingyuyigezhongyaodefangxiang。


冰球突破 图1. 等离激元极化激元在材料中产生和传播的示意图。

  erweicailiaoshishixianzheiyimubiaodelixiangpingtai,zaierweicailiaozhong,youyudenglijiyuanbeixianzhizaiyigepingmiannei,qishuaijiandedaolejidadeyizhi。shimoxizuoweideerweicailiaodedianxingdaibiao,yijingchengweiyigejiqiremendedenglijiyuancailiao。raner,zuoweibanjinshu,shimoxizhongzailiuzinongdujiaodi,yinciqidenglijiyuandepinlvyuandiyuchangjiandekejianguangqu。qitadeerweicailiao,yeduoweibanjinshuxing(ruguixiheerxihuatai)huobandaotixing(rudanhuapengheerliuhuamu),yinerwufamibuzailiuzinongdudizheiyiquexian。yinci,xunzhaoheshideerweijinshucailiao,bujinkeyichanshengdishuaijianlvdedenglijiyuan,erqiekeyiyukejianguangjinxingouhe,zaijichengguangzixueqijianzhongyouzhezhongyaodeyingyong。pengxishiyizhongxinxingerweicailiao,qidutezhichuzaiyuqibenzhengdejinshuxing,yushizhepengxishihenyouxiwangdedenglijiyuancailiao。

图2. (a) β12型硼烯晶格结构以及布里渊区; (b) β12冰球突破型硼烯等离激元沿Γ-X 与Γ-Y方向的色散关系。图中展示了低能模式(LE)、高能模式(HE),和石墨烯中的等离激元。

  最近,冰球突破/北京凝聚态物理国家研究中心表面物理国家重点实验室SF10组的博士后廉超(现为德州大学奥斯汀分校博士后)和博士生胡史奇(共同第一作者),以及已毕业的张进博士和程才博士,在孟胜研究员的指导下,与北京师范大学袁喆教授和北京计算科学中心高世武教授合作,通过第一性原理含时密度泛函模拟,计算了实验上合成的β12型硼烯中的奇异的等离激元特性(图2和图3)。

图3. (a) β12型硼烯等离激元限域能力λair/λp随能量的变化; (b) β12冰球突破型硼烯等离激元传播损失率Re[q]/Im[q]随能量的变化。

  tamenfaxian,xiangbiyushimoxiheheilindengcailiao,pengxizaibaochierweicailiaojiaoqiangdeguangyucailiaoxianghuzuoyongdetongshi,youyuqijinshutexingyijiteshudedilakenengdaijiegou,tazaidianzinongdu、denglijiyuanpinyudengfangmianyouzheyouyidedenglijiyuanxingneng。yanjiufaxianpengxizhongcunzailiangleizailiuzi:zhongxinzaixdiandeyiweidianziqi,hezhongxinzaiydiandeerweidianziqi(tu4)。liangzhongzailiuzifenbieduiyinglepengxidenglijiyuandelianggefenzhi:erweidianziqixingchenglegexiangjunyundegaonengliangfenzhi,eryiweidianziqizexingchenglegexiangyixingdedinengliangfenzhi。zheiliangzhongmoshiyouzhehangaitaihezidaoziwaiboduanguangfandepinlvfanwei,yincikeyiyukejianguangshixianchongfenouhe。tongshi,liangzhidenglijiyuanjuyouheshimoxidenglijiyuantongyangdedishuaijianlv(tu3)。

图4. (a) β12型硼烯三维能带结构; (b) β12型硼烯布里渊区电子气分布;(c) β12型硼烯电子气带内跃迁分布。

  gengweidutedeshi,pengxidenglijiyuandedinengliangfenzhijinzaiγ-xfangxiangxingchenghechuanbo。butongyuyiwangyiweijiegoudedenglijiyuan,zheiyifaxianyiweizhezaierweijiegouzhongyirankeyicunzaidanxiangchuanshudeyiweidenglijiyuanmoshi。gengshenrudedianzijiegoufenxizhengminglezheigeyiweimoshiyuanziyupengxidutededianzijiegou,bingqieyoupengxizhongdilakedianzidedaineiyueqiansuogongxian。yanjiubiaoming,erweipengxizhongcunzaizhebixiangxiangzhonggengweifengfudeguangyuwuzhidexianghuzuoyongtuxiang,erwei、yiweidianziqiyudilakedianziqijitijifadexianghuzuoyongshidaozhiqiyiliangzidenglijiyuanchuxiandezhongyaoyuanyin,zheiyefuyuqidisunhao、kuanpinyuhegaodingxiangdengyouliangtexing。zheiyifaxiantuozhanleyishimoxiweidaibiaodeerweicailiaodenglijiyuanzheiyiyanjiulingyu,weifengfudenglijiyuanguangzixuecailiaotigonglexindesilu。

  xiangguanchengguojinrifabiaozai《wulitongxunkuaibao》(physical review letters) shanghttp://journals.aps.org/prl/abstract/10.1103/physrevlett.125.116802。gaigongzuodedaolekejibuzhongdianyanfajihua(2016yfa0300902,2015cb921001)heguojiazirankexuejijinwei(11774396, 91850120, 11934004)dezizhu。zuozheganxieyuwulisuolulingyanjiuyuandeyouyitaolun。