Jing Zhang

Tunable flux through a synthetic hall tube of neutral Fermions

Physical Review A 102, 063327(2020)

Hall tube with a tunable flux is an important geometry for studying quantum Hall physics, but its experimental realization in real space is still challenging. Here, we propose to realize a synthetic Hall tube with tunable flux in a one-dimensional optical lattice with the synthetic ring dimension defined by atomic hyperfine states. We investigate the effects of the flux on the ...

Photoassociation spectroscopy of weakly bound ⁸⁷Rb₂ molecules near the 5P_1/2 + 5S_1/2 threshold by optical Bragg scattering in Bose-Einstein condensates

Physical Review A 102, 053326(2020)

We report the high-resolution photoassociation (PA) spectroscopy of a ⁸⁷Rb Bose-Einstein condensate (BEC) to excited molecular states near the dissociation limit of 5P_1/2 + 5S_1/2 by optical Bragg scattering. Since the detection of optical Bragg scattering in the BEC has a high signal-noise ratio, we obtain the high-resolution PA spectrum of excited molecular...

A FinFET with one atomic layer channel

Nature Communications 10, 1205(2020)

Since its invention in the 1960s, one of the most significant evolutions of metal-oxide-semiconductor field effect transistors (MOS-FETs) would be the three dimensionalized version that makes the semiconducting channel vertically wrapped by conformal gate electrodes, also recognized as FinFET. During the past decades, the width of fin (W_fin) in FinFETs has shrunk...

Experimental realization of spin-tensor momentum coupling in ultracold Fermi gases

Physical Review A  102, 013309(2020)

We experimentally realize spin-tensor momentum coupling (STMC) using three ground Zeeman states coupled by three Raman laser beams in an ultracold atomic system of 40K Fermi atoms. This type of STMC consists of two bright-state bands as a spin-orbit coupled spin-1/2 system and one dark-state middle band. Using radio-frequency spin-injection spectroscopy...

Gate tunable giant anisotropic resistance in ultra-thin GaTe

Nature Communications 10, 2302(2019)

Anisotropy in crystals arises from different lattice periodicity along different crystallographic directions, and is usually more pronounced in two dimensional (2D) materials. Indeed, in the emerging 2D materials, electrical anisotropy has been one of the recent research focuses. However, key understandings of the in-plane anisotropic resistance in low-symmetry...

Preparation of bipartite bound entangled Gaussian states in quan tum optics

Physical Review A 100, 022309(2019)

The positivity of the partial transpose is in general only a necessary condition for separability. There exist quantum states that are not separable, but nevertheless are positive under the partial transpose. States of this typeare known as bound entangled states, meaning that these states are entangled but they do not allow distillation of pure entanglement...

Electric-field control of magnetism in a few-layered van der Waals ferromagnetic semiconductor

Nature Nanotechnology 13,554(2018)

Manipulating a quantum state via electrostatic gating has been of great importance for many model systems in nano-electronics. Until now, however, controlling the electron spins or, more specifically, the magnetism of a system by electric-field tuning has proven challenging. Recently, atomically thin magnetic semiconductors have attracted significant...

Quantum secret sharing among four players using multipartite bound entanglement of an optical field

Physical Review Letters 121, 150502(2018)

Secret sharing is a conventional technique for realizing secure communications in information networks, where a dealer distributes to n players a secret, which can only be decoded through the cooperation of k(n/2＜k ≤n) players. In recent years, quantum resources have been employed to enhance security of secret sharing, which has been named quantum...

Controllable coupled-resonator-induced transparency in a dual-recycled Michelson interferometer

Physical Review A 98, 953804(2018)

We theoretically and experimentally study the effect of the coupled-resonator-induced transparency in theMichelson interferometer with the dual-recycled configuration, which is equivalent to the adjustable coupled resonator. The coupling strength, corresponding to the splitting of the reflection spectrum and associated with the width of the coupled-resonator-induced...

Universal feature in optical control of a p-wave Feshbach resonance

Physical Review A 97, 012702(2018)

We report the experimental results on the optical control of a p-wave Feshbach resonance by utilizing a laser-driven bound-to-bound transition to shift the energy of a closed-channel molecule state. The magnetic field location for the p-wave resonance as a function of laser detuning can be captured by a simple formula with essentially one...

Observation of Floquet bands in driven spin-orbit-coupled Fermi gases

Physical Review A 98, 013615(2018)

Periodic driving of a quantum system can significantly alter its energy bands and even change the band topology, opening a completely new avenue for engineering novel quantum matter. Although important progress has been made recently in measuring topological properties of Floquet bands in different systems, direct experimental measurement of full...

Experimental observation of one-dimensional superradiance lattices in ultracold atoms

Physical Review Letters 120, 193601(2018)

We measure the superradiant emission in a one-dimensional (1D) superradiance lattice (SL) in ultracold atoms. Resonantly excited to a superradiant state, the atoms are further coupled to other collectively excited states, which form a 1D SL. The directional emission of one of the superradiant excited states in the 1D SL is measured. The emission spectra...

Enhanced detection of a low-frequency signal by using broad squeezed light and a bichromatic local oscillator

Physical Review A 96, 023808(2017)

We experimentally study a protocol of using the broadband high-frequency squeezed vacuum to detect the low-frequency signal. In this scheme, the lower sideband field of the squeezed light carries the low-frequency modulation signal, and the two strong coherent light fields are applied as the bichromatic local oscillator in the homodyne detection to measure...

Experimental observation of a topological band gap opening in ultracold Fermi gases with two-dimensional spin-orbit coupling

Physical Review Letters 117, 235304(2016)

The recent experimental realization of synthetic spin-orbit coupling (SOC) opens a new avenue for exploring novel quantum states with ultracold atoms. However, in experiments for generating two dimensional SOC (e.g., Rashba type), a perpendicular Zeeman field, which opens a band gap at the Dirac point and induces many topological phenomena, is still lacking...

Experimental realization of a two-dimensional synthetic spin-orbit coupling in ultracold Fermi gases

Nature Physics 12, 540-544(2016)

Spin-orbit coupling (SOC) is central to many physical phenomena, including fine structures ofatomic spectra and quantum topological matters. Whereas SOC is in general fixed in a physicalsystem, atom-laser interaction provides physicists a unique means to create and control synthetic SOC for ultracold atoms. Despite significantexperimental progress...

Dissociation of Feshbach molecules via spin-orbit coupling in ultracold Fermi gases

Physical Review A 91, 041604(R)(2015)

We study the dissociation of Feshbach molecules in ultracold Fermi gases with spin-orbit (SO) coupling. Since SO coupling can induce a quantum transition between Feshbach molecules and the fully polarized Fermi gas, the Feshbach molecules can be dissociated by the SO coupling. We experimentally realize this type of dissociation in ultracold gases of ⁴⁰K atoms...

Production of Feshbach molecules induced by spin–orbit coupling in Fermi gases

Nature Physics 10,110(2014)

Optical control of a magnetic Feshbach resonance in ultra cold Fermi gas

Physical Review A 88, 041601 (2013) 

Radio-frequency spectroscopy of a strongly interacting spin-orbit-coupled Fermi gas

Physical Review A 87, 053619 (2013)