Fano resonance in a cavity-reflector hybrid system
Fano resonance in a cavity-reflector hybrid system
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DOI：
10.1103/physrevb.95.041407
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发表时间：
2017-01
影响因子：
3.7
通讯作者：
C. Yan;Sanjeev Kumar;M. Pepper;P. See;I. Farrer;D. Ritchie;J. Griffiths;G. Jones
中科院分区：
文献类型：
--
作者：
C. Yan;Sanjeev Kumar;M. Pepper;P. See;I. Farrer;D. Ritchie;J. Griffiths;G. Jones
© 2017作者。发表于美国物理学会.我们提出了在一个混合系统中的传输测量的结果，该混合系统由一个拱形的量子点接触（QPC）和一个反射器组成;它们一起在它们之间形成一个电子腔。在调谐QPC和反射器时，在一维到二维的过渡处观察到电阻的非对称共振峰。此外，在QPC的夹断附近的电阻下降被发现是强烈依赖于反射器电压。这两种结构与Fano线形非常吻合。发现Fano共振在施加横向磁场时变弱，并且在100 mT时模糊。此外，Fano形状具有很强的温度依赖性，当温度从1.5 K升高到20 K时，Fano形状逐渐消失。这一结果可能对实现量子信息处理的器件有帮助。
© 2017 authors. Published by the American Physical Society.We present the results of transport measurements in a hybrid system consisting of an arch-shaped quantum point contact (QPC) and a reflector; together, they form an electronic cavity in between them. On tuning the arch-QPC and the reflector, an asymmetric resonance peak in resistance is observed at the one-dimension to two-dimension transition. Moreover, a dip in resistance near the pinch-off of the QPC is found to be strongly dependent on the reflector voltage. These two structures fit very well with the Fano line shape. The Fano resonance was found to get weakened on applying a transverse magnetic field, and smeared out at 100 mT. In addition, the Fano-like shape exhibited a strong temperature dependence and gradually smeared out when the temperature was increased from 1.5 to 20 K. The results might be useful in realizing devices for quantum information processing.