Article
Nanoscience & Nanotechnology
G. A. Lara, J. P. Ramos-Andrade, D. Zambrano, P. A. Orellana
Summary: In this article, the quantum transport through a single-level quantum dot in the Kondo regime coupled to topological superconductors with Majorana zero modes is investigated. The results show that the presence of Majorana zero modes modifies the Kondo resonance, leading to spin-resolved behavior of the measurable current and differential conductance. This study provides insights into the interplay between the Kondo effect and Majorana zero modes.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Sayedreza Safdari, Morteza Soltani, Gholamreza Rashedi
Summary: We studied a 5-terminal system consisting of three single level quantum dots in contact with their respective reservoirs. In addition to the intra-dot Coulomb interaction, the electron in one dot is affected by an inter-dot Coulomb repulsion from its adjacent dot. Using the Anderson type model Hamiltonian and Greens function method, we investigated the transport properties of the system. Numerical analysis revealed a correlation between the transport characteristics of the lower and upper dot, which can be controlled by varying the parameters of the upper dot. We also found that the inter-dot Coulomb interaction improves the thermoelectric performance of the system.
Article
Materials Science, Multidisciplinary
Sheng-Qiang Zhong, Shun-Cai Zhao, Sheng-Nan Zhu
Summary: Double quantum dots as light-absorbing devices benefit greatly from electron tunneling effect, which enhances the quantum photovoltaic yields and leads to efficient carrier redistribution for improved photovoltaic properties. The robust tunneling effect can reduce passive impacts and clarify the role difference between ambient temperature and tunneling effect, providing insights for future assembled QD arrays photocells.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Damian Tomaszewski, Piotr Busz, Jan Martinek
Summary: This paper provides a detailed theoretical description of the influence of spin accumulation in metallic Fermi leads on the Kondo effect in systems such as quantum dots and Kondo alloys. The study shows that the presence of spin accumulation, magnetic field, and ferromagnetic leads spin polarization can suppress the Kondo effect, but for appropriately selected parameter values, these effects can compensate each other and may lead to the restoration of the Kondo effect in the analyzed systems. The paper also discusses recent experiments related to spin current in Kondo alloys.
Article
Materials Science, Multidisciplinary
Jia-Ning Wang, Wang-Huai Zhou, Yu-Xiong Yan, Wei Li, Nan Nan, Jun Zhang, Ya-Nan Ma, Peng-Chao Wang, Xiang-Rui Ma, Shi-Jun Luo, Yong-Chen Xiong
Summary: This article studies the characteristics and properties of hybrid tripartite quantum dot devices, models and analyzes them using the numerical renormalization group method, and proposes unified formulations applicable to different interaction scenarios.
Article
Materials Science, Multidisciplinary
Feng Chi, Qiang-Sheng Jia, Jia Liu, Qing-Guo Gao, Zi-Chuan Yi, Li-Ming Liu
Summary: We investigate the Josephson current in a system with two superconductors connected to a quantum dot (QD) which is side-coupled to a nanowire hosting Majorana bound states (MBSs). Our findings demonstrate that the MBSs alter both the peak height and position in the current-carrying density of states (CCDOS), thereby determining the amplitude of the Josephson current. By adjusting the energy level in the QD and the hybridization strengths between MBSs and the QD, control over electron transport processes can be achieved. These results have implications for superconductor-based electronic devices and superconducting coated conductors.
Article
Physics, Multidisciplinary
D. Watfa, R. Delagrange, A. Kadlecova, M. Ferrier, A. Kasumov, H. Bouchiat, R. Deblock
Summary: The high frequency emission of a carbon nanotube based Josephson junction was investigated and compared to its dc Josephson current. It was found that the Kondo effect can enhance the dc supercurrent while strongly reducing the ac Josephson effect.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
D. F. Aranguren-Quintero, E. Ramos, J. Silva-Valencia, M. S. Figueira, L. N. Oliveira, R. Franco
Summary: This study explores the temperature-dependent thermoelectric transport properties of semiconductor nanostructures, focusing on the electrical conductance, thermal conductance, and thermopower. By calculating universal thermoelectric transport coefficients, the results are extended to various thermoelectric properties, providing insights through numerical renormalization-group results and experimental data.
Article
Materials Science, Multidisciplinary
V. N. Mantsevich, D. S. Smirnov
Summary: The weak spin-orbit coupling in nonmagnetic semiconductor nanostructures limits the current-induced spin accumulation. However, the Kondo effect provides a possibility to parametrically increase spin polarization. By considering the many-body correlations between a quantum dot and a quantum wire, the current-induced spin accumulation can be enhanced by almost two orders of magnitude at low temperatures, due to the Kondo peak formation and the spin instability caused by strong Coulomb interaction. This effect could be useful for electrically manipulating localized electron spins in quantum dots for quantum applications.
Article
Chemistry, Multidisciplinary
Yumei Gao, Xiaoyan Zhang, Zichuan Yi, Liming Liu, Feng Chi
Summary: In this study, it is found that the thermal phase equivalent conductance can be significantly enhanced and change signs in a Josephson junction system composed of two superconductors connected to a semiconductor quantum dot. This result arises from the new states formed near the Fermi level of the superconductors due to the hybridization between the quantum dot and the Majorana bound states. The sign change of the thermal phase equivalent conductance provides strong evidence for the existence of Majorana bound states.
Article
Chemistry, Physical
Hong Mao, Jinshuang Jin, Shikuan Wang, YiJing Yan
Summary: In this study, we investigate the nonequilibrium current noise spectrum of single impurity Anderson model quantum dot systems using accurate dissipation equation of motion evaluations. We identify several key features, such as asymmetrical upturns and remarkable peaks, which may be related to interference between two Kondo resonance channels. This study is published under an exclusive license by AIP Publishing.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Valentin Bruch, Mikhail Pletyukhov, Herbert Schoeller, Dante M. Kennes
Summary: By combining nonequilibrium renormalization group method with Floquet theory, we investigate the interplay of strong correlations and coherent driving in the strong coupling Kondo model driven by a time-periodic bias voltage. We find that coherent dressing of the driving field leads to the emergence of side replicas of the Kondo resonance in the conductance, which are not completely washed out by the decoherence induced by the driving. Our study highlights the relevance of non-Markovian memory effects and the limitations of simple phenomenological pictures and adiabatic approximations in capturing the interplay between driving and strong correlations.
Article
Nanoscience & Nanotechnology
Tong-Tong Xu, Tong Gong, Lian-Lian Zhang, Wei-Jiang Gong
Summary: We theoretically investigate the transport properties in the T-shaped double-quantum-dot structure with Majorana bound states (MBSs) coupled to the dot in the main channel. The results show that in the linear transport regime, the side-coupled dot can account for the influence of the MBS on the transport behaviors, regardless of the Coulomb interaction in the QDs. Furthermore, the presence or absence of superconducting pairing potential in the QDs has different effects on the linear conductance.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Emma L. Minarelli, Jonas B. Rigo, Andrew K. Mitchell
Summary: This article investigates a graphene-based two-channel charge-Kondo device and uncovers a rich phase diagram. It finds that the strong coupling pseudogap Kondo phase persists in the channel-asymmetric case. Furthermore, despite the vanishing density of states in the graphene leads, a finite linear conductance is observed at the frustrated critical point.
Article
Physics, Multidisciplinary
Yi-Ming Liu, Yuan-Dong Wang, Jian-Hua Wei
Summary: New characteristics of the Kondo effect, arising from spin chirality induced by the Berry phase in the equilibrium state, are investigated. The analysis is based on the hierarchical equations of motion (HEOM) approach in a triangular triple quantum-dot (TTQD) structure. The study finds that under the influence of a perpendicular magnetic field, the spin chirality leads to the splitting of the Kondo peak, indicating the important role of the phase factor in the Kondo effect. This work provides insight into the quantum transport of strongly correlated electronic systems.