Related Experiment Video
Updated: Jun 5, 2026
06:53
Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
Spin edge helices in a perpendicular magnetic field
1Department of Physics, University of Regensburg, 93040 Regensburg, Germany. Samvel.Badalyan@physik.uni-regensburg.de
Physical Review Letters
|January 15, 2011
Summary
We solved spin edge states in 2D electron systems with combined spin-orbit fields. The edge orientation critically affects spin states, creating tunable persistent spin helix modes.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Quantum Mechanics
Background:
- Spin-orbit interactions are crucial in spintronics.
- Understanding edge states is key for device applications.
- Combining Bychkov-Rashba and Dresselhaus fields presents unique challenges.
Purpose of the Study:
- To find an exact solution for spin edge states.
- To investigate the impact of sample edge orientation.
- To explore novel spin helix modes.
Main Methods:
- Analytical solution for a 2D electron system.
- Inclusion of hard-wall confinement and magnetic field.
- Analysis of spin-orbit coupling effects.
Main Results:
- The spin edge state spectrum is highly sensitive to edge orientation.
- New persistent spin helix-spin edge helix modes are discovered.
- These novel states exhibit tunable properties via electric and magnetic fields.
Conclusions:
- Exact solutions reveal critical dependencies on geometric factors.
- Novel spin helix modes offer new avenues for spintronic devices.
- Tunability of these states is promising for future applications.
Related Concept Videos
01:27Magnetic Fields
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
01:19Magnetic Field Lines
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic field lines follow several hard-and-fast rules:
01:22Motion Of A Charged Particle In A Magnetic Field
A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
00:59Atomic Nuclei: Nuclear Magnetic Moment
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
01:18Magnetic Field Due to Two Straight Wires
Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
01:23Magnetic Field due to Moving Charges
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...