Related Experiment Video
Updated: May 30, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Fluctuations and criticality in quantum paraelectrics.
Nabyendu Das1, Suresh G Mishra
1Institute of Physics, Bhubaneswar 751005, India.
Summary
This study calculates the dielectric susceptibility of systems with fluctuating dipoles, finding good agreement with quantum paraelectric materials like strontium titanate. The research identifies a gapped quantum paraelectric and suggests methods for creating quantum critical paraelectrics.
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Understanding the behavior of dielectric susceptibility in materials with fluctuating dipoles is crucial for developing advanced electronic components.
- Quantum paraelectric materials exhibit unique dielectric properties at low temperatures, making them of significant scientific interest.
Purpose of the Study:
- To calculate the temperature dependence of static dielectric susceptibility in systems with strongly coupled fluctuating dipoles.
- To compare the theoretical results with experimental data from quantum paraelectric strontium titanate (SrTiO3).
- To identify the system as a gapped quantum paraelectric and explore pathways for realizing quantum critical paraelectrics.
Main Methods:
- Utilizing a self-consistent mean fluctuation field approximation to model the system.
- Analyzing the temperature dependence of static dielectric susceptibility.
Main Results:
- The calculated temperature dependence of dielectric susceptibility shows qualitative agreement with experimental data for SrTiO3 at low temperatures.
- The system studied was identified as a gapped quantum paraelectric.
Conclusions:
- The theoretical model provides a good approximation for the behavior of quantum paraelectrics.
- Hydrostatic pressure or impurity doping are proposed as experimental methods to achieve a quantum critical paraelectric state.
Related Concept Videos
01:12Fermi Level Dynamics
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
04:08The Uncertainty Principle
Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He mathematically...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:27Electrostatic Boundary Conditions in Dielectrics
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
02:32The de Broglie Wavelength
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
01:31Dielectric Polarization in a Capacitor
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...