Observation of subdiffusive dynamic scaling in a driven and disordered box-trapped Bose gas

In their recent study, Gevorg Martirosyan and colleagues explore the dynamics of a tuneable box-trapped Bose gas under strong periodic forcing in the presence of weak disorder. The team observes that in absence of interparticle interactions, the interplay of the drive and disorder results in an isotropic nonthermal momentum distribution that shows subdiffusive dynamic scaling characterized by sublinear energy growth and a universal scaling function captured well by a compressed exponential. As interaction strength increases, the gas behavior crosses over to wave turbulence characterized by a power-law momentum distribution. The researchers note that this observation sheds light on how external driving forces can affect disordered systems and have implications for understanding complex physical systems such as turbulent fluids and plasmas. Overall, this study provides new insights into the behavior of Bose gases under strong periodic forcing in the presence of weak disorder, highlighting the importance of considering both external driving forces and interparticle interactions when studying complex physical systems.

Exploring the Dynamics of a Tuneable Box-Trapped Bose Gas Under Strong Periodic Forcing in the Presence of Weak Disorder

Recent research by Gevorg Martirosyan and colleagues has shed light on how external driving forces can affect disordered systems. In their study, they explored the dynamics of a tuneable box-trapped Bose gas under strong periodic forcing in the presence of weak disorder. The team observed that when interparticle interactions are absent, an isotropic nonthermal momentum distribution is formed with subdiffusive dynamic scaling characterized by sublinear energy growth and a universal scaling function captured well by a compressed exponential. As interaction strength increases, however, the gas behavior crosses over to wave turbulence characterized by a power-law momentum distribution. This observation has implications for understanding complex physical systems such as turbulent fluids and plasmas.

Background Information

The study of disordered systems is essential to understanding complex physical phenomena such as turbulent fluids and plasmas. These systems are often driven externally - that is, subjected to some type of periodic or random force - which can have significant effects on their behavior. To better understand these effects, researchers must consider both external driving forces and interparticle interactions when studying disordered systems.

The Study

In this study, Gevorg Martirosyan and colleagues explored the dynamics of a tuneable box-trapped Bose gas under strong periodic forcing in the presence of weak disorder. The team used ultracold atoms trapped in an optical lattice potential to simulate this system; this allowed them to control parameters such as temperature, particle number density, interaction strength between particles (via Feshbach resonance), and external drive frequency (via laser intensity).

The researchers observed that when interparticle interactions were absent (i.e., at low temperatures or with zero interaction strength), an isotropic nonthermal momentum distribution was formed with subdiffusive dynamic scaling characterized by sublinear energy growth and a universal scaling function captured well by a compressed exponential. As interaction strength increased (i.e., at higher temperatures or with stronger interactions), however, the gas behavior crossed over to wave turbulence characterized by a power-law momentum distribution instead - indicating that both external driving forces and interparticle interactions must be considered when studying complex physical systems like turbulent fluids or plasmas.

Conclusion

Overall, this study provides new insights into the behavior of Bose gases under strong periodic forcing in the presence of weak disorder - highlighting how important it is to consider both external driving forces and interparticle interactions when studying complex physical phenomena like turbulent fluids or plasmas