Stefański Piotr
Institute of Molecular Physics of the Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland.
J Phys Condens Matter. 2016 Dec 21;28(50):505301. doi: 10.1088/0953-8984/28/50/505301. Epub 2016 Oct 21.
We consider a model of a Josephson junction mediated by a quantum dot. An additional normal electrode coupled to the dot allows its density of states to be probed. The junction is made out of two topological superconducting wires with Majorana end states. The two of them, on each side and in the proximity of the junction, convert into a Dirac fermion inside the dot. It is shown that both the density of states of the dot and the phase-biased current through the junction can exhibit [Formula: see text] periodicity in the superconducting phase difference, when the particle-hole symmetry of the junction is broken. It is realized by detuning of the dot level from the Fermi level by the gate voltage. The width of zero-bias peak in differential conductance, produced by an unpaired Majorana state, also possesses [Formula: see text] periodicity under this condition.
我们考虑一个由量子点介导的约瑟夫森结模型。与量子点耦合的额外正常电极允许探测其态密度。该结由具有马约拉纳端态的两条拓扑超导线构成。它们中的两条，在结的每一侧且靠近结的位置，在量子点内部转化为狄拉克费米子。结果表明，当结的粒子 - 空穴对称性被打破时，量子点的态密度和通过结的相位偏置电流在超导相位差中都可以呈现出[公式：见原文]周期性。这是通过栅极电压使量子点能级与费米能级失谐来实现的。在这种情况下，由未配对的马约拉纳态产生的微分电导中的零偏置峰宽度也具有[公式：见原文]周期性。
