Robust Majorana signature detection with a coupled quantum dot-nanomechanical resonator in all-optical domain

• Main Authors: Chen, Hua-Jun, Chen, Chang-Zhao, Fang, Xian-Wen, Li, Yang, Miao, Guang-Hong, Tu, Shao-Fei, Zhu, Ka-Di
• Format: Journal Article
• Language: English
• Published: 29.10.2015
• Subjects: Physics - Mesoscale and Nanoscale Physics; Physics - Strongly Correlated Electrons
• DOI: 10.48550/arxiv.1510.08679

Motivated by a recent experiment [Nadj-Perge et al., Science 346, 602 (2014)] providing evidence for Majorana zero modes in iron chains on the superconducting Pb surface, in the present work, we theoretically propose an all-optical scheme to detect Majorana fermions, which is very different from the current tunneling measurement based on electrical means. The optical detection proposal consists of a quantum dot embedded in a nanomechanical resonator with optical pump-probe technology. With the optical means, the signal in the coherent optical spectrum presents a distinct signature for the existence of Majorana fermions in the end of iron chains. Further, the vibration of the nanomechanical resonator behaving as a phonon cavity will enhance the exciton resonance spectrum, which makes the Majorana fermions more sensitive to be detectable. This optical scheme affords a potential supplement for detection of Majorana fermions and supports to use Majorana fermions in Fe chains as qubits for potential applications in quantum computing devices.