Related Experiment Video
Updated: May 11, 2026
![Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59399.jpg&w=3840&q=50)
Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
Published on: September 13, 2019
Extremely slow spin relaxation in a spin-unpolarized quantum Hall system
1Institute of Solid State Physics, RAS, Chernogolovka 142432, Moscow District, Russia.
Cyclotron spin-flip excitations in quantum Hall systems relax very slowly, enabling Bose-Einstein condensate formation. This condensate can be controlled with optical pulses.
Area of Science:
- Condensed Matter Physics
- Quantum Hall Effect
- Bose-Einstein Condensation
Background:
- Cyclotron spin-flip excitations in a nu=2 quantum Hall system exhibit slow relaxation due to acoustic phonon emission.
- The energy gap characteristics separate these excitations from the ground state and magnetoplasma excitations.
Purpose of the Study:
- To investigate the slow relaxation dynamics of cyclotron spin-flip excitations.
- To explore the potential for forming a Bose-Einstein condensate from these excitations.
- To determine the feasibility of controlling the condensate with optical pulses.
Main Methods:
- Theoretical calculation of characteristic relaxation time.
- Analysis of excitation dynamics in wide-thickness quantum wells.
- Modeling of Bose-Einstein condensate formation and optical control.
Main Results:
- Calculated a characteristic relaxation time of approximately 1 second for cyclotron spin-flip excitations.
- Demonstrated that slow relaxation allows for the creation of a high-density, coherent ensemble.
- Identified the potential for forming a Bose-Einstein condensate in a small phase volume.
Conclusions:
- Extremely slow relaxation is key to achieving a Bose-Einstein condensate of cyclotron spin-flip excitations.
- The condensate state can be switched on and off using short optical pulses (~1 μs).
- This research opens possibilities for controlling quantum coherent states in Hall systems.
Related Concept Videos
Atomic Nuclei: Types of Nuclear Relaxation
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Atomic Nuclei: Nuclear Relaxation Processes
Atomic Nuclei: Nuclear Spin State Population Distribution
Atomic Nuclei: Nuclear Spin State Overview
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...

