A5060476053- Cold Atom Physics and Bose-Einstein Condensates
- Strong Light-Matter Interactions
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Quantum optics and atomic interactions
- Advanced Fiber Laser Technologies
- Quantum, superfluid, helium dynamics
- Quantum Information and Cryptography
- Advanced Frequency and Time Standards
- Atomic and Molecular Physics
- GaN-based semiconductor devices and materials
- Semiconductor Lasers and Optical Devices
- Laser Design and Applications
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Advanced Chemical Physics Studies
Hong Kong University of Science and Technology
2020-2024
University of Hong Kong
2020-2024
Long-range and anisotropic dipolar interactions induce complex order in quantum systems, particularly interesting 2D where superfluidity emerges via the Berezinskii-Kosterlitz-Thouless (BKT) mechanism. We observe a superfluid phase with algebraically decaying correlation quasi-2D Bose gas of erbium atoms further identify transition by monitoring extended coherence. also measure equations state tunable interactions. Our findings show point shift due to dipole orientation, aligning BKT...
We describe an experimental setup for producing a large cold erbium (Er) sample in narrow-line magneto-optical trap (MOT) simple and efficient way. implement pair of angled slowing beams with respect to the Zeeman slower axis, further slow down atoms exiting from slower. The second-stage enable MOT higher velocity. This scheme is particularly useful when at low optical power without conventional transverse cooling between oven slower, which case we significantly improve loading efficiency...
We present a simple and effective method to implement an active stabilization of diode laser with injection locking, which requires minimal user intervenes. The injection-locked state the is probed by photodetector, sensitivity enhanced narrow laser-line filter. Taking advantage characteristic response power spectral modes from filter, we demonstrate that high purity low-intensity noise can be simultaneously maintained feedback injected laser. Our intrinsically cost-effective does not...
Long-range and anisotropic dipolar interactions induce complex order in quantum systems. It becomes particularly interesting two-dimension (2D), where the superfluidity with quasi-long-range emerges via Berezinskii-Kosterlitz-Thouless (BKT) mechanism, which still remains elusive interactions. Here, we observe BKT transition from a normal gas to superfluid phase quasi-2D Bose of erbium atoms. Controlling orientation dipoles, characterize point by monitoring extended coherence measuring...
Dicke superradiance occurs when two or more emitters cooperatively interact via the electromagnetic field. This collective light-scattering process has been extensively studied across various platforms, from atoms to quantum dots and organic molecules. Despite extensive research, precise role of direct interactions between in remains elusive, particularly many-body systems where complexity poses significant challenges. In this study, we investigate effect dipole-dipole interaction 18 000...
The 53rd Annual Meeting of the APS Division Atomic, Molecular and Optical Physics will take place from May 30 – June 3, 2022 in Orlando, Fl, USA. <a href="https://morressier.zoom.us/j/89880865272?pwd=SWxTRGhra1ZOSDBrSkhVZDBzVDR6UT09/">Virtual Presenter Help Desk</a>
Accurately measuring magnetic fields is essential for magnetic-field sensitive experiments in like atomic, molecular, and optical physics, condensed matter experiments, other areas. However, since many are conducted an isolated vacuum environment that inaccessible to experimentalists, it can be challenging accurately determine the field. Here, we propose efficient method detecting with assistance of artificial neural network (NN). Instead field directly at desired location, detect several...
The 53rd Annual Meeting of the APS Division Atomic, Molecular and Optical Physics will take place from May 30 – June 3, 2022 in Orlando, Fl, USA. <a href="https://morressier.zoom.us/j/89880865272?pwd=SWxTRGhra1ZOSDBrSkhVZDBzVDR6UT09/">Virtual Presenter Help Desk</a>
The 53rd Annual Meeting of the APS Division Atomic, Molecular and Optical Physics will take place from May 30 – June 3, 2022 in Orlando, Fl, USA. <a href="https://morressier.zoom.us/j/89880865272?pwd=SWxTRGhra1ZOSDBrSkhVZDBzVDR6UT09/">Virtual Presenter Help Desk</a>
Despite the extensive study of matter-wave superradiance in a Bose-Einstein condensate (BEC) using its unique coherence property, controllability superradiant process has remained limited previous studies exploiting phase-coherent with isotropic contact interactions. Here, we combine tunable s-wave scattering dipolar interactions BEC $^{168}$Er atoms wherein asymmetry and threshold are independently controlled. By changing length near Feshbach resonance, tune increasing phase fluctuations....
We present a simple and effective method to implement an active stabilization of diode laser with injection locking, which requires minimal user intervenes. The locked state the is probed by photodetector, sensitivity enhanced narrow laser-line filter. Taking advantage characteristic response power spectral modes from filter, we demonstrate that high purity low intensity noise can be simultaneously maintained feedback injected laser. Our intrinsically cost-effective, does not require bulky...