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Effectively tuning the quantum Griffiths phase by controllable quantum fluctuations
Beilin Wang1,2,3, Guopei Ying1,2,3, Linhai Guo1,2,3
1CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei 230026, China.
Science Advances
|November 27, 2024
Summary
Researchers demonstrate control over the quantum Griffiths phase (QGP) in superconductivity using magnetic field orientation and electrostatic gating. This manipulation offers new insights into controlling quantum fluctuations and understanding QGP phenomena.
Area of Science:
- Condensed Matter Physics
- Superconductivity
- Quantum Phenomena
Background:
- The quantum Griffiths phase (QGP) is a significant phenomenon in superconductivity, characterized by a quantum Griffiths singularity.
- Controlling the QGP has been a persistent challenge in experimental research.
- Understanding the role of quantum fluctuations is crucial for manipulating QGP.
Purpose of the Study:
- To demonstrate experimental control over the quantum Griffiths phase (QGP) at the LaAlO3/KTaO3(110) interface.
- To investigate the influence of magnetic field orientation on QGP characteristics.
- To explore the effect of electrostatic gating on modulating the QGP phase boundary.
Main Methods:
- Applied magnetic fields with varying orientations (perpendicular and parallel) to the LaAlO3/KTaO3(110) interface.
- Utilized electrostatic gating to tune the quantum fluctuations.
- Analyzed the critical field behavior as a function of temperature under different conditions.
Main Results:
- A perpendicular magnetic field induced an anomalous QGP with a decreasing critical field at low temperatures.
- A parallel magnetic field resulted in a normal QGP with an increasing critical field as temperature decreased.
- Electrostatic gating effectively tuned the QGP phase boundary by controlling quantum fluctuations.
Conclusions:
- The orientation of the magnetic field is a key factor in controlling and differentiating QGP behaviors.
- Quantum fluctuations can be effectively modulated by both magnetic field orientation and electrostatic gating.
- These findings provide a pathway for experimental manipulation of QGP and a deeper understanding of quantum fluctuations in superconductivity.
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