Richter Thomas, Blömers Christian, Lüth Hans, Calarco Raffaella, Indlekofer Michael, Marso Michel, Schäpers Thomas
Institute of Bio- and Nanosystems (IBN-1) and JARA-FIT Julich-Aachen Research Alliance, Forschungszentrum Julich, 52425 Julich, Germany.
Nano Lett. 2008 Sep;8(9):2834-8. doi: 10.1021/nl8014389. Epub 2008 Aug 20.
InN nanowires, grown by plasma-enhanced molecular beam epitaxy, were investigated by means of magnetotransport. By performing temperature-dependent transport measurements and current measurements on a large number of nanowires of different dimensions, it is proven that the carrier transport mainly takes place in a tube-like surface electron gas. Measurements on three representative nanowires under an axially oriented magnetic field revealed pronounced magnetoconductance oscillations with a periodicity corresponding to a single magnetic flux quantum. The periodicity is explained by the effect of the magnetic flux penetrating the coherent circular quantum states in the InN nanowires, rather than by Aharonov-Bohm type interferences. The occurrence of the single magnetic flux quantum periodicity is attributed to the magnetic flux dependence of phase-coherent circular states with different angular momentum quantum numbers forming the one-dimensional transport channels. These phase coherent states can exist because of the almost ideal crystalline properties of the InN nanowires prepared by self-assembled growth.
通过磁输运手段对采用等离子体增强分子束外延生长的氮化铟（InN）纳米线进行了研究。通过对大量不同尺寸的纳米线进行温度相关的输运测量和电流测量，证实了载流子输运主要发生在管状表面电子气中。在轴向磁场下对三根代表性纳米线的测量揭示了明显的磁电导振荡，其周期对应于单个磁通量量子。这种周期性是由穿透InN纳米线中相干圆形量子态的磁通量效应来解释的，而不是由阿哈罗诺夫 - 玻姆（Aharonov - Bohm）型干涉来解释。单个磁通量量子周期性的出现归因于形成一维输运通道的具有不同角动量量子数的相相干圆形态的磁通量依赖性。由于通过自组装生长制备的InN纳米线具有几乎理想的晶体特性，这些相相干态得以存在。
