Disorder effects on quantum transport and quantum phase transition in low-dimensional superconducting and topological systems

Ji, Haijiao; Liu, Haiwen; Jiang, Hua; Xie, Xiaoming

doi:10.1080/23746149.2021.1884133

Cited by 9 publications

(6 citation statements)

References 137 publications

(200 reference statements)

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“…The divergence of zν can be well described by the activated scaling law z ν ∝ false| B − B c * false| − ν ψ , where ν ≈ 1.2 and the tunneling critical exponent Ψ ≈ 0.5 for a 2D system. The experimental discovery of QGS reveals the dramatic influence of disorder on the quantum phase transition and characterizes the dynamics of a system with locally superconducting rare regions around the QCP − (Figure b,c). The QGS is subsequently found to be a universal quantum phenomenon in various 2D superconducting systems, including Pb film, PdTe 2 films, NbSe 2 films, 4 Ha -TaSe 2 flakes, etc.…”

Section: Quantum Griffiths Singularitymentioning

confidence: 99%

Two-Dimensional and Interface Superconductivity in Crystalline Systems

Ji,

Liu,

et al. 2024

Acc. Mater. Res.

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Section: Quantum Griffiths Singularitymentioning

confidence: 99%

Two-Dimensional and Interface Superconductivity in Crystalline Systems

Ji,

Liu,

et al. 2024

Acc. Mater. Res.

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“…Randomness and disorder are essential elements in real condensed matter systems and play prominent roles in phase transitions [75][76][77][78]. Particularly, rare regions are found to significantly influence the classical phase transitions and lead to singular free energy (i.e.…”

Section: Quantum Griffiths Singularity (Qgs)mentioning

confidence: 99%

Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress

Wang,

Liu,

et al. 2023

Rep. Prog. Phys.

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Superconductor–insulator/metal transition (SMT) as a paradigm of quantum phase transition has been a research highlight over the last three decades. Benefit from recent developments in the fabrication and measurements of two-dimensional (2D) superconducting films and nanodevices, unprecedented quantum phenomena have been revealed in the quantum phase transitions of 2D superconductors. In this review, we introduce the recent progress on quantum phase transitions in 2D superconductors, focusing on the quantum Griffiths singularity (QGS) and anomalous metal state. Characterized by a divergent critical exponent when approaching zero temperature, QGS of SMT is discovered in ultrathin crystalline Ga films and subsequently detected in various 2D superconductors. The universality of QGS indicates the profound influence of quenched disorder on quantum phase transitions. Besides, in a 2D superconducting system, whether a metallic ground state can exist is a long-sought mystery. Early experimental studies indicate an intermediate metallic state in the quantum phase transition of 2D superconductors. Recently, in high-temperature superconducting films with patterned nanopores, a robust anomalous metal state (i.e. quantum metal or Bose metal) has been detected, featured as the saturated resistance in the low temperature regime. Moreover, the charge-2e quantum oscillations are observed in nanopatterned films, indicating the bosonic nature of the anomalous metal state and ending the debate on whether bosons can exist as a metal. The evidences of the anomalous metal states have also been reported in crystalline epitaxial thin films and exfoliated nanoflakes, as well as granular composite films. High quality filters are used in these works to exclude the influence of external high frequency noises in ultralow temperature measurements. The observations of QGS and metallic ground states in 2D superconductors not only reveal the prominent role of quantum fluctuations and dissipations but also provide new perspective to explore quantum phase transitions in superconducting systems.

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“…The QCA is based on quantum physics principles such as tunneling across a potential barrier. 11 The QCA is based on the notion of artificial semiconductor atoms, which lets the implementation of digital modules at nano-scales. It is necessary to have a container to keep electrons inside in order to build a system that can process information depending on their location.…”

Section: Principles Faults and Fault-tolerant Circuitsmentioning

confidence: 99%

A New Nano-Design of a Fault-Tolerant Coplanar RAM with Set/Reset Ability Based on Quantum-Dots

Wei¹,

Guo²

2022

ECS J. Solid State Sci. Technol.

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Quantum Dot Cellular Automata (QCA) is a recent technology that has piqued researchers’ interest because of its small size and low energy consumption. With the help of quantum dots, the QCA technology delivers a new computational foundation for constructing digital circuits. Medical imaging and quantum computing are just a few applications for quantum dots. Quantum dots are nanocrystals that transmit data at the nano-scale. Since the memory is an important digital circuit, this work proposes a fault-tolerant loop-based coplanar Random Access Memory (RAM) with set/reset capability that uses the QCA rules. The memory cell’s operation is verified both physically and through simulations with the QCADesigner program. The quantum cost of the proposed memory cell shows that it has a negligible quantum cost. The proposed QCA-based memory circuit performs well in simulations, with 96 QCA cells and the output signal generated after 0.75 clock phases. The gates and wire in this design have around 85 percent better fault-tolerant capability than the best-presented memory systems. Furthermore, this circuit can tolerate most cell omission, displacement, misalignment, and deposition faults. This structure can be used to create high-performance higher-order fault-tolerant memory structures.

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Disorder effects on quantum transport and quantum phase transition in low-dimensional superconducting and topological systems

Cited by 9 publications

References 137 publications

Two-Dimensional and Interface Superconductivity in Crystalline Systems

Two-Dimensional and Interface Superconductivity in Crystalline Systems

Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress

A New Nano-Design of a Fault-Tolerant Coplanar RAM with Set/Reset Ability Based on Quantum-Dots

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