Atomic Bose and Anderson glasses in optical lattices

Area of Science:

• Quantum physics
• Condensed matter physics
• Ultracold atomic gases

Background:

• Ultracold atomic Bose gases in optical lattices are crucial for simulating condensed matter phenomena.
• Understanding the behavior of these systems under disorder is essential for quantum simulation and condensed matter physics.

Purpose of the Study:

• To investigate the controlled analysis of disordered Bose lattice gases using ultracold atomic Bose gases in optical lattices.
• To explore the dynamical transitions between superfluid and glass phases induced by controlled disorder.

Main Methods:

• Utilizing ultracold atomic Bose gases in optical lattices.
• Introducing controlled disorder via a second lattice or speckle patterns.
• Analyzing systems in both strong and weak interaction limits with noncommensurable filling factors.

Main Results:

• Demonstrated a dynamical transition from superfluid to Bose-glass phase in the strong-interaction limit with increasing disorder.
• Observed a dynamical transition from superfluid to Anderson-glass phase in the weak-interaction limit.
• Showed that low-intensity disorder-inducing lasers significantly alter the superfluid fraction in both regimes.

Conclusions:

• Ultracold atomic Bose gases in optical lattices provide an ideal platform for controlled disorder analysis.
• Dynamical transitions to glassy phases are achievable and sensitive to disorder intensity.
• The superfluid fraction is highly susceptible to disorder, even at low levels.