A5042787954- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Atomic and Subatomic Physics Research
- Quantum and electron transport phenomena
- Advanced Frequency and Time Standards
- Theoretical and Computational Physics
- Topological Materials and Phenomena
- Magnetic Properties and Applications
- Quantum Computing Algorithms and Architecture
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Quantum Mechanics and Applications
- Copper Interconnects and Reliability
- Rare-earth and actinide compounds
- Characterization and Applications of Magnetic Nanoparticles
- Spectroscopy and Laser Applications
- Relativity and Gravitational Theory
- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Opinion Dynamics and Social Influence
- Crystallography and Radiation Phenomena
- Multiferroics and related materials
University of Science and Technology Beijing
2022-2024
Institute of Theoretical Physics
2022-2024
Tsinghua University
2015-2023
Arizona State University
1987-1990
For a mixture of alkali-earth atomic gas in the long-lived excited state ^{3}P_{0} and ground ^{1}S_{0}, addition to nuclear spin, another "orbital" index is introduced distinguish these two internal states. In this Letter we propose mechanism induce Feshbach resonance between atoms with different orbital spin quantum numbers. Two essential ingredients are interorbital spin-exchange process dependence Landé g factors. Here degrees freedom plays similar role as electron degree magnetic...
Alkaline-earth-metal atoms have a long-lived electronic excited state, and when in this state are localized the Fermi sea of ground-state by an external potential, they serve as magnetic impurities, due to spin-exchange interaction between excited- atoms. This can give rise Kondo effect. However, order achieve effect current atomic gas experiments, it requires temperature be increased sizable portion temperature. In paper we calculate confinement-induced resonance (CIR) for spin-exchanging...
Abstract Recently the Rydberg blockade effect has been utilized to realize quantum spin liquid (QSL) on a kagome lattice. Evidence of QSL obtained experimentally by directly measuring non-local string order. In this paper, we report Bardeen–Cooper–Schrieffer (BCS)-type variational wave function study state in model. This is motivated mapping model lattice gauge theory, where local conservations replace role constraints from blockade. We determine parameter experimental measurement atom...
Recent advances in optical Feshbach resonance technique have enabled the experimental investigation of atomic gases with time-dependent interaction. In this work, we study many-body dynamics weakly interacting bosons subject an arbitrary time varying scattering length. By employing a variational ansatz, derive effective Hamiltonian that governs thermal particles. Crucially, show there exists hidden symmetry can map to precession SU(1,1) "spin". As demonstration, calculate situation where...
The one-dimensional lattice Schwinger model has recently been realized by using bosons in optical lattices. This contains both confinement and deconfinement phases, whose phase diagram is controlled the mass of matter field topological angle. Since varying straightforward experimentally, we propose how to tune angle, allowing accessing entire diagram. We that direct experimental evidence can be obtained measuring whether a physical charge localized around fixed gauge screen it. also discuss...
Gauge theories in (1+1)D have attracted renewed attention partially due to their experimental realizations quantum simulation platforms. In this work, we revisit the lattice massive Schwinger model and Abelian-Higgs model, uncovering previously overlooked universal features, including emergence of a supersymmetric critical point when Maxwell term's coefficient changes sign. To facilitate these theories, adopt strategy truncating electric field eigenvalues finite subset, preserving exact...
We propose to realize a strongly interacting Fermi superfluid near narrow Feshbach resonance using the recently discovered ``orbital resonance.'' The orbital is type of magnetic field tunable scattering theoretically predicted and experimentally observed in alkaline-earth-metal-like $^{173}\mathrm{Yb}$ atom. first show that energy, while it hundreds Gauss wide terms strength, taking advantage moment difference between open closed channels quite small. Therefore, this an ideal platform for...
The Kondo effect describes the spin-exchange interaction between localized impurities and itinerant fermions. ultracold alkaline-earth atomic gas provides a natural platform for quantum simulation of model, utilizing its long-lived clock state nuclear-spin exchange ground state. One key issue now is whether temperature can be high enough to reached in current experiments, which we have proposed use transverse confinement confine atoms into one-dimensional tube confinement-induced resonance...
We discuss a Rydberg atom chain with tunable blockade radius from the gauge theoretic perspective. When is one lattice spacing, this system can be formulated in terms of PXP model, and there $\mathbb{Z}_2$ Ising phase transition known to equivalent confinement-deconfinement theory, Schwinger model. Further increasing radius, add next-nearest neighbor (NNN) interaction into interpretation NNN theory how finite alters deconfinement behavior propose corresponding experimental protocol. reaches...
Hayden and Preskill proposed a thought experiment in which Bob can recover the information Alice throws into black hole if he has quantum computer entangled with hole, for Yoshida Kitaev recently concrete decoding scheme. In context of many-body physics, parallel question is that after small system thermalized large system, how one decode initial state help two systems? Here, we propose to realize this protocol physical Dicke models, cavity fields prepared thermofield double state. We show...
Recently, a new type of Feshbach resonance, i.e., orbital resonance (OFR), was proposed for the ultracold alkaline-earth-metal--like atoms and experimentally observed in gases $^{173}\mathrm{Yb}$ atoms. Unlike most magnetic resonances alkali atoms, when OFR appears, energy gap between thresholds open channel (OC) closed (CC) is much smaller than characteristic interatomic interaction, van der Waals energy. In this paper we study systems with small CC-OC threshold gap. We show that these can...
In the ultracold gases of alkali-earth (like) atoms, a new type Feshbach resonance, i.e., orbital resonance (OFR), has been proposed and experimentally observed in $^{173}$Yb atoms. When OFR atoms occurs, energy gap between open closed channels is smaller by two orders magnitudes than van der Waals energy. As result, quantitative accurate results for low-energy two-body problems can be obtained via multi-channel quantum defect theory (MQDT), which based on exact solution Schr$\ddot{{\rm...
It has been shown by several groups that Fe layers in epitaxial Fe/Cr sandwiches or multilayers (MLFs) are coupled antiferromagnetically (AF) for very small Cr thicknesses. One way this is manifest the MLF a fixed thickness (30 Å) hysteresis curves progressively flatter as decreases. This opposite behavior to expected if were uncoupled ferromagnetically coupled. We have observed same type of series nominally 21-Å Co/X MLFs where X varies from 14 57 Å. These well characterized with both x-ray...
Magnetic properties of multilayered Co/Cr films have been investigated by ferromagnetic resonance (FMR) and compared to magnetization studies carried out on a SQUID magnetometer. The interesting feature observed in most the spectra was that along with an intense corresponding uniform mode, several weak but well-defined peaks were at higher magnetic fields. angular temperature variations line positions indicates these are due cobalt atoms interface. In conjunction static magnetization, FMR...
We herein report on the density- and temperature-dependent decay of 93mNb nuclear excited atom present a simple interpretation underlying physics. This anomaly indicates resonant absorption delocalisation long-lived Mössbauer state in crystal. A non-linear magnetoelectric response, low-frequency drive current, appeared bulk metal high-purity niobium crystal then disappeared along with disappearance delocalised excitation. Several peaks, order several hundred Hertz, increased magnitude...
Rydberg atom arrays have emerged as a novel platform exhibiting rich quantum many-body physics and offering promise for universal computation. The blockade effect plays an essential role in establishing correlations this system. In review, we will highlight that the lattice gauge theory is efficient description of overview recent exciting developments system from equilibrium phases to dynamics. These include realizing exotic ground states such spin liquids, discovering scar violating...