Magnetic Manipulation of Massless Dirac Fermions in Graphene Quantum Dot

• 来源期刊: 理论物理通讯(英文版)
• 学科: 物理学
• 关键词: 量子点 费米子 狄拉克 石墨 操纵 质量 能量变化 磁通量
• 年，卷（期）: 2010,（12）
• 页码范围: 1134-1138
• 页数: 5页
• 分类号: O471.1 O413.3
• 语种: 英文

摘要

We have theoretically analyzed the quasibound states in a graphene quantum dot (GQD) with a magneticflux Φ in the centre.It is shown that the two-fold time reversal degeneracy is broken and the quasibound states of GQDwith positive/negative angular momentum shifted upwards /downwards with increasing the magnetic flux.The variationof the quasibound energy depends linearly on the magnetic flux, which is quite different from the parabolic relationshipfor Schrdinger electrons.The GQD's quasibound states spectrum shows an obvious Aharonov-Bohm (AB) oscillationswith the magnetic flux.It is also shown that the quasibound state with energy equal to the barrier height becomes abound state completely confined in GQD.