Related Experiment Video
Updated: Jul 16, 2026
09:01
High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
Published on: April 16, 2017
Thermal escape from a metastable state in periodically driven Josephson junctions.
Guozhu Sun1, Ning Dong, Guangfeng Mao
1Research Institute of Superconductor Electronics, Department of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China.
Summary
Researchers observed resonant activation and noise-enhanced stability in Josephson tunnel junctions. Thermal escape from a potential well showed resonance-like behavior dependent on driving frequency and initial conditions.
Area of Science:
- Physics
- Quantum Electronics
- Nonlinear Dynamics
Background:
- Josephson tunnel junctions are crucial quantum electronic devices.
- Understanding thermal activation and noise effects is vital for device stability.
- Nonlinear dynamics govern the behavior of underdamped systems.
Purpose of the Study:
- To investigate resonant activation in a real physical system.
- To explore noise-enhanced stability in Josephson tunnel junctions.
- To analyze the influence of driving force frequency and initial conditions on thermal escape.
Main Methods:
- Experimental observation in an underdamped Josephson tunnel junction system.
- Application of a weak sinusoidal driving force.
- Analysis of thermal activated escape from a potential well.
- Comparison with numerical simulations.
Main Results:
- Resonant activation phenomena were observed.
- Noise-enhanced stability was demonstrated.
- Resonance behavior was frequency-dependent.
- Initial conditions significantly impacted the observed resonances.
Conclusions:
- Josephson tunnel junctions exhibit resonant activation.
- Noise plays a crucial role in enhancing stability.
- System dynamics are sensitive to driving frequency and initial states.
Related Concept Videos
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:22Switching of BJT
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are reverse-biased. The...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
01:21Characteristics of JFET
Junction Field Effect Transistors (JFETs) exhibit specific operational characteristics based on the relationship between the drain current (id) and the drain-source voltage (Vds), along with varying gate-source voltages (Vgs).
The core of a JFET's operation is controlling drain current by modulating the gate-source voltage. When the drain and gate voltage are set to zero, the JFET exhibits no net current flow, representing a state of equilibrium. The drain current increases linearly as the...
The core of a JFET's operation is controlling drain current by modulating the gate-source voltage. When the drain and gate voltage are set to zero, the JFET exhibits no net current flow, representing a state of equilibrium. The drain current increases linearly as the...
01:11P-N junction
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
01:21Path Between Thermodynamics States
Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1: