从理论上研究了电磁场调制下非本征石墨烯中的Hartman效应.利用相位移动及传递矩阵的方法计算粒子隧穿的群延迟时间τg,系统地分析群延迟时间与不同参数(如粒子能量E、入射角度θ、电磁场强度U和A等)之间的关系.石墨烯中的载流子是狄拉克费米子,故用狄拉克方程表征.研究发现在势垒宽度足够大时,石墨烯中的狄拉克费米子隧穿通过势垒的群延迟时间τg与势垒宽度无关,证明Hartman效应不仅存在于静电场下零带隙的石墨烯中,还存在于电磁场调制下非本征(非零带隙)的石墨烯中.
参考文献
| [1] | Condon U .Quantum mechanics of collision processes[J].Reviews of Modern Physics,1931,3(01):43. |
| [2] | MacColl L A .Note on the transmission and reflection of wave packets by potential barriers[J].Physical Review,1932,40(04):621. |
| [3] | Chiao R Y;Steinberg A M .Tunneling times and superluminality[J].Progress in Optics,1997,37:345. |
| [4] | Winful HG .Tunneling time, the Hartman effect, and superluminality: A proposed resolution of an old paradox[J].Physics Reports: A Review Section of Physics Letters (Section C),2006(1-2):1-69. |
| [5] | Novoselov K S;Geim A K;Morozov S V et al.Electric field effect in atomically thin carbon films[J].Science,2004,306(5696):666. |
| [6] | Zhang Y;Tan J W;Stormer H L et al.Experimental observation of the quantum Hall effect and Berry's phase in graphene[J].Nature,2005,438(7065):201. |
| [7] | S.Y.ZHOU;G.-H.GWEON;A.V.FED0R0V .Substrate-induced bandgap opening in epitaxial graphene[J].Nature materials,2007(10):770-775. |
| [8] | Gusynin VP;Sharapov SG .Unconventional integer quantum Hall effect in graphene[J].Physical review letters,2005(14):6801-1-6801-4-0. |
| [9] | Katsnelson M I;Novoselov K S;Geim A K .Chiral tunnelling and the Klein paradox in graphene[J].Nature Physics,2006,2(09):620. |
| [10] | Lin Xin,Wang Hai-Long,Pan Hui,Xu Huai-Zhe.Gap opening and tuning in single-layer graphene with combined electric and magnetic field modulation[J].中国物理B（英文版）,2011(04):446-455. |
| [11] | Zhenhua Wu;Kai Chang;J. T. Liu;X. J. Li;K. S. Chan .The Hartman effect in graphene[J].Journal of Applied Physics,2009(4):043702-1-043702-5-0. |
| [12] | Farhad Sattari;Edris Faizabadi .Tunneling time and Hartman effect in a ferromagnetic graphene superlattice[J].AIP Advances,2012,2(01):012123. |
| [13] | Xu, X.G.;Cao, J.C. .Dwell time in one-dimensional graphene asymmetrical barrier[J].Physica, B. Condensed Matter,2012(3):281-285. |
| [14] | Castro Neto, AH;Guinea, F;Peres, NMR;Novoselov, KS;Geim, AK .The electronic properties of graphene[J].Reviews of Modern Physics,2009(1):109-162. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%