Coherent tunneling through a double quantum dot coupled to Majorana bound states

2017 ◽  
Vol 96 (3) ◽  
Author(s):  
T. I. Ivanov
Keyword(s):  
Quantum Dot ◽  
Bound States ◽  
Double Quantum ◽  
Majorana Bound States ◽  
Double Quantum Dot ◽  
Coherent Tunneling

scholarly journals Electronic Transport Through Double Quantum Dot Coupled to Majorana Bound States and Ferromagnetic Leads

2021 ◽  
Vol 8 ◽  
Author(s):  
Li-Wen Tang ◽  
Wei-Guo Mao
Keyword(s):  
Quantum Dot ◽  
Coupling Strength ◽  
Bound States ◽  
High Efficiency ◽  
Energy Levels ◽  
Electrical Current ◽  
Function Technique ◽  
Double Quantum ◽  
Majorana Bound States ◽  
Double Quantum Dot

We have studied theoretically the properties of electrical current and tunnel magnetoresistance (TMR) through a serially connected double quantum dot (DQD) sandwiched between two ferromagnetic leads by using the nonequilibrium Green’s function technique. We consider that each of the DQD couples to one mode of the Majorana bound states (MBSs) formed at the ends of a topological superconductor nanowire with spin-dependent coupling strength. By adjusting the sign of the spin polarization of dot–MBS coupling strength and the arrangement of magnetic moments of the two leads, the currents’ magnitude can be effectively enhanced or suppressed. Under some conditions, a negative TMR emerges which is useful in detection of the MBSs, a research subject currently under extensive investigations. Moreover, the amplitude of the TMR can be adjusted in a large regime by variation of several system parameters, such as direct hybridization strength between the MBSs or the dots and the positions of the dots’ energy levels. Such tunable currents and TMR may also find use in high-efficiency spintronic devices or information processes.

scholarly journals Andreev reflection in a T-shaped double quantum-dot with coupled Majorana bound states

2016 ◽  
Vol 65 (13) ◽  
pp. 137302
Author(s):  
Wang Su-Xin ◽  
Li Yu-Xian ◽  
Wang Ning ◽  
Liu Jian-Jun
Keyword(s):  
Quantum Dot ◽  
Bound States ◽  
Andreev Reflection ◽  
Double Quantum ◽  
Majorana Bound States ◽  
Double Quantum Dot

Andreev Reflection in a T-Shaped Double-Quantum-Dot Structure Induced by Majorana Bound States

2014 ◽  
Vol 83 (3) ◽  
pp. 034706 ◽  
Author(s):  
Wei-Jiang Gong ◽  
Shu-feng Zhang ◽  
Zhi-Chao Li ◽  
Guangyu Yi ◽  
Yi-Song Zheng
Keyword(s):  
Quantum Dot ◽  
Bound States ◽  
Andreev Reflection ◽  
Double Quantum ◽  
Majorana Bound States ◽  
Double Quantum Dot

scholarly journals Spatial Rabi oscillations between Majorana bound states and quantum dots

2018 ◽  
Vol 9 ◽  
pp. 1527-1535
Author(s):  
Jun-Hui Zheng ◽  
Dao-Xin Yao ◽  
Zhi Wang
Keyword(s):  
Quantum Dot ◽  
Bound States ◽  
Bound State ◽  
Double Quantum ◽  
Energy Splitting ◽  
Rabi Oscillations ◽  
Andreev Bound States ◽  
Majorana Bound States ◽  
Nonlocal Quantum ◽  
Equal Amplitude

Background: A Majorana bound state is a superconducting quasiparticle that is the superposition of particle and hole with equal amplitude. We propose a verification of this amplitude equality by analyzing the spatial Rabi oscillations of the quantum states of a quantum dot that is tunneling-coupled to the Majorana bound states. Results: We find two resonant Rabi driving energies that correspond to the energy splitting due to the coupling of two spatially separated Majorana bound states. The resulting Rabi oscillating frequencies from these two different resonant driving energies are identical for the Majorana bound states, while different for ordinary Andreev bound states. We further study a double-quantum-dot setup and find a nonlocal quantum correlation between them that is mediated by two Majorana bound states. This nonlocal correlation has the signature of additional resonant driving energies. Conclusion: Our method can be used to distinguish between Majorana bound states and Andreev bound states. It also gives a precise measurement of the energy splitting between two Majorana bound states.

scholarly journals Mechanically probing coherent tunneling in a double quantum dot

2011 ◽  
Vol 84 (20) ◽  
Author(s):  
J. Gardner ◽  
S. D. Bennett ◽  
A. A. Clerk
Keyword(s):  
Quantum Dot ◽  
Double Quantum ◽  
Double Quantum Dot ◽  
Coherent Tunneling
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