PostDoc and graduate students are welcome to join us
Research in AMO physics, Laser physics and Optics!!!
NEWS!
2020.6 Observing macroscopy quantum tunnelling of Bose Einstein Condensate
2020.5 Unexpected Rydberg state interaction inducing cold atom trap loss!
2019.6 : Invite Sideband amplitude modulation (SAM) spectroscopy, A temporal differential method for high sensitivity and no spectral profile distortion!
2017.6 : NICE-OHMS with an optical cavity F=114000, we observed the weak N2O sub-Doppler absorption!
2016.8 : Even the deuteron is also smaller!!
2016.2 : We measured a laser linewdth by counting its photons!
2015.9 : The first NICE-OHMS based on a quantum dot laser!
2014.4 : The higher precision muonium spectroscopy!
2013.4 : The most intensive ultracold molecular cloud and its novel detection technique!
2013.1 : Indeed, it is smaller! Proton size puzzle reinforced!
More information...
Our main research interests are: the interaction between light and matter, to manipulate atoms and to explore the fundamental physics using atomic systems, including:
1. The implement of Laser cooling technology and High precision laser spectroscopy (such as NICE-OHSM, Noise-immune cavity-enhanced optical-heterodyne molecular spectroscopy), are for detecting the fundamental symmetry violation in atomic systems, such as: Time-reversal violation, and Parity non-conservation (PNC) that are mostly studied using a large scaled high-energy accelerators. However, with the latest laser spectroscopy technique, the AMO experiments, in the very low energy regime, can reach a comparable sensitivity with those high energy approaches. The very weak symmetry violation phenomena in atomic systems can be observed on an optical table. You could call it as a desktop high-energy experiments.
2. Ultracold collisions between ionic and neutral atoms and molecules have undergone a great development in the last few years. Such studies can unveil the secrets of charge transportation in the superconductivity, ultracold chemical reactions in interstellar astrophysics, and be as a candidate for quantum gates. Recently, the technologies of simultaneous trapping neutral and charged particle became feasible.
We proposal to build a hybrid trap for ionic and neutral K, Rb, K2, Rb2, KRb, based on our current neutral-only trap. Our trap is a small rectangular glass cell, which is suitable to build an ion trap (in the air, out of vacuum) to trap ions inside the vacuum chamber with a minimum modification. The ionic particles can be produced using the photoionization of the ultracold atoms (molecules) with a 405 nm blue laser. The collision rates are then studied by the optical dipole trap losses of the co-exiting atoms, which has been studied in our group.
3.The laser spectroscopy with excotic atom, muonic hydrogen, muonic helium, which is an international collaboration CREMA, can reveal the secret of nuclear structure, including the charge and magnetic radius. The precision is much superior to that of the electron-scattering. Its result will bring a large impact to the nuclear physics, and may lead to the New physics. We have found a unexpected smaller proton size (the proton size puzzle). Now, this experiment is aiming on muonic helium.
Physics Building Room 307,308,309
Tel: 33295 or 42277
