Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Imperfections in Crystal Structure: Point, Line and Plane Defects

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

Imperfections in Crystal Structure: Stoichiometric Point Defects

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Potential Due to a Polarized Object

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...

Properties of Laplace Transform-II

Properties of Laplace Transform-II

Time differentiation, convolution, integration, and periodicity are fundamental concepts in analyzing functions and signals over time. Each concept provides a unique perspective on how functions evolve, interact, and repeat, offering essential tools for various scientific and engineering applications.
Time differentiation involves analyzing the rate of change of a function over time. Mathematically, it is the derivative of a function with respect to time. This concept can be likened to tracking...

Modes of Standing Waves - I

Modes of Standing Waves - I

A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Colonic Transit Induced by Intermittent Stimulation of Sacral S2 Spinal Root in Cats with Intact or Injured Spinal Cord.

Neuromodulation : journal of the International Neuromodulation Society·2026

Same author

APOE4 Drives Uniquely Dysfunctional Human Microglial States in Alzheimer's Disease.

bioRxiv : the preprint server for biology·2026

Same author

Synthesis of an amidinate-supported arsasilene and its attempted oxidation.

Chemical communications (Cambridge, England)·2026

Same author

Propagation properties of radially polarized hyperbolic sine non-uniform coherent beams in atmospheric turbulence.

Journal of the Optical Society of America. A, Optics, image science, and vision·2026

Same author

Peroxidase-Enriched Extracellular Vesicles from <i>Ginkgo biloba</i> Ameliorate Acute Lung Injury via ROS Scavenging, M2 Macrophage Polarization and Barrier Protection.

ACS applied materials & interfaces·2026

Same author

FSAPF: A De-Scattering Framework With Stepwise Adjustment of Polarization Features.

IEEE transactions on image processing : a publication of the IEEE Signal Processing Society·2026

Search research articles

Related Experiment Video

Updated: Jun 9, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Defect modes in defective parity-time symmetric periodic complex potentials.

Keya Zhou¹, Zhongyi Guo, Jicheng Wang

¹Department of Physics, Harbin Institute of Technology, Harbin 150001, China.

|September 3, 2010

Summary

Researchers explored defect modes in parity-time (PT) symmetric potentials. Positive defects prolong conserved modes, while negative defects shorten them or lead to dissipation before the phase transition.

More Related Videos

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Related Experiment Videos

Last Updated: Jun 9, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Physics
Quantum Mechanics
Optics

Background:

Parity-time (PT) symmetry offers unique properties in complex potentials.
Localized modes in periodic potentials are crucial for wave manipulation.
Understanding defect modes is key to controlling energy flow and localization.

Purpose of the Study:

Investigate defect modes in PT-symmetric periodic complex potentials.
Analyze the impact of positive and negative defects on mode behavior.
Explore the conditions for conserved and dissipative linear localized modes.

Main Methods:

Theoretical analysis of PT-symmetric periodic complex potentials.
Study of defect modes with both positive and negative defect types.
Examination of mode energy conservation and dissipation characteristics.

Main Results:

Identified new linear localized modes in PT-symmetric potentials.
Positive defects extend the existence domain of conserved modes.
Negative defects shorten conserved mode domains and can induce dissipation before PT symmetry breaking.

Conclusions:

Defect modes in PT-symmetric potentials exhibit tunable energy dynamics.
The sign and strength of defects significantly influence mode localization and conservation.
These findings offer new avenues for controlling wave propagation in complex optical systems.