Related Experiment Video
Updated: May 28, 2025
08:59
Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
Published on: June 13, 2022
2.5K
Orbital Pumping Incorporating Both Orbital Angular Momentum and Position
Seungyun Han1, Hye-Won Ko2, Jung Hyun Oh2
1Pohang University of Science and Technology, Department of Physics, Pohang 37673, Korea.
Physical Review Letters
|February 10, 2025
Summary
We introduce adiabatic orbital pumping, a new method to generate orbital currents. This process, distinct from spin pumping, can be driven by magnetic fields or lattice vibrations, offering novel avenues for spintronic and phononic device applications.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Materials science
Background:
- Spin pumping is a known phenomenon generating spin currents.
- Existing theories of orbital torque are incomplete.
- Understanding orbital angular momentum dynamics is crucial for novel electronic devices.
Purpose of the Study:
- To develop a theory of adiabatic orbital pumping.
- To differentiate orbital pumping from spin pumping.
- To explore new methods for generating orbital currents.
Main Methods:
- Theoretical development of adiabatic orbital pumping.
- Analysis of orbital angular momentum current generation.
- Comparison with spin pumping mechanisms.
Main Results:
- Adiabatic orbital pumping generates both orbital angular momentum and orbital position currents.
- Orbital currents produce transverse electric voltages with second-harmonic components.
- Lattice dynamics (phonon angular momentum) can drive orbital currents.
Conclusions:
- Orbital pumping presents a new mechanism for generating orbital currents.
- Orbital currents have unique properties compared to spin currents.
- This work broadens understanding of spin, orbital, and phonon dynamics interplay.
Related Concept Videos
01:21Angular Momentum
185
Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
185
01:10Angular Momentum: Single Particle
6.1K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
6.1K
01:23Principle of Angular Impulse and Momentum
503
The angular impulse and momentum principle provides insights into how forces applied at a distance from an object's rotational axis influence its angular velocity. It builds upon the crucial relationship between the moment of force and angular momentum. By integrating this equation, substituting the limits for the initial and final times, a comprehensive expression representing the angular impulse and momentum principle is derived.
503
01:11Angular Momentum about an Arbitrary Axis
185
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
185
01:18Conservation of Angular Momentum: Application
10.8K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
10.8K
01:09Angular Momentum and Principle Axes of Inertia
190
The concept of angular momentum for a solid structure is illustrated as the cumulative result of the cross-product of the position vector of the mass element and the cross-product of the body's angular velocity with the position vector.
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
190