A5038403035- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Advanced Thermodynamics and Statistical Mechanics
- Cold Atom Physics and Bose-Einstein Condensates
- Geophysics and Sensor Technology
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- Electronic and Structural Properties of Oxides
- Thermal Radiation and Cooling Technologies
- Quantum Mechanics and Applications
- Thermal properties of materials
- Surface and Thin Film Phenomena
- Advanced Chemical Physics Studies
- Advanced MEMS and NEMS Technologies
- Photonic and Optical Devices
- Magneto-Optical Properties and Applications
- Advanced Condensed Matter Physics
- Advancements in Semiconductor Devices and Circuit Design
Dalian University of Technology
2024-2025
Tsinghua University
2021-2025
Abstract Quantum phase transitions (QPTs) are usually associated with many-body systems in the thermodynamic limit when their ground states show abrupt changes at zero temperature variation of a parameter Hamiltonian. Recently it has been realized that QPT can also occur system composed only two-level atom and single-mode bosonic field, described by quantum Rabi model (QRM). Here we report an experimental demonstration QRM using 171 Yb + ion Paul trap. We measure spin-up state population...
Charge density wave (CDW) material 1 T -TaS 2 was proposed as a quantum spin liquid candidate, on which cluster Mott insulator comes into being below the transition temperature. We report an experimental ultrafast generation and detection of coherent amplitude mode (AM) its CDW state. A salient feature emerges: The AM exhibits unusual 3.56 temperature dependence 65 K, in addition to observed 200 K range. This behavior suggests enhancement in-gap electronic excitations emergence new phase...
Non-equilibrium spin-chain systems have been attracting increasing interest in energy transport. This work studies a one-dimensional non-equilibrium Ising chain immersed tilted magnetic field, where every spin contacts Boson reservoir with the dissipative system–environment interaction. We analytically investigate dynamics and steady-state transport taking advantage of Born–Markov-secular master equation. In longitudinal one can find that non-dissipative N′ spins decompose into + 1...
A quantum thermal device based on three nearest-neighbor coupled spin-1/2 systems controlled by the magnetic field is proposed. We systematically study steady-state behaviors of system. When two terminals our system are in contact with reservoirs, respectively, behaves as a perfect modulator that can manipulate heat current from zero to specific values adjusting magnetic-field direction over different parameter ranges, since longitudinal completely block transport. Significantly, also be...
The crucial limitation of improving the sensitivity detection weak magnetic fields is unavoidable measurement noise. In this paper, we propose a scheme to achieve precise sensing robust against additional noise by employing dual frequency bias field modulation within cavity-magnon system. We find that antirotating wave term can amplify signal detected field, but amplification effect must coexist with rotating term. particular, modulation, robustness cavity thermal substantially enhanced,...
Dissipation is often considered as a detrimental effect in quantum systems for unitary operations. However, it has been shown that suitable dissipation can be useful resources both information and simulation. Here, we propose experimentally simulate dissipative phase transition (DPT) model using single trapped ion with an engineered reservoir. We show the ion's spatial oscillation mode reaches steady state after alternating application of evolution under Rabi Hamiltonian sideband cooling...
Quantum noise and thermal are the two primary sources of that limit sensitivity weak magnetic field sensing. Although quantum has been widely addressed, effectively reducing remains challenging in detecting fields. We employ an anisotropic elliptical YIG sphere as a probe to establish parametric amplification interaction magnons induce magnon squeezing effects. These effects can suppress mode amplify signals from external sources. Specifically, complete suppression be achieved by placing...
A quantum thermal device based on three nearest-neighbor coupled spin-1/2 systems controlled by the magnetic field is proposed. We systematically study steady-state behaviors of system. When two terminals our system are in contact with reservoirs, respectively, behaves as a perfect modulator that can manipulate heat current from zero to specific values adjusting direction over different parameter ranges, since longitudinal completely block transport. Significantly, also be achieved when...
The mechanical strain can control the frequency of two-level atoms in amorphous material. In this work, we would like to employ two coupled manipulate magnitude and direction heat transport by controlling realize function a thermal switch valve. It is found that high-performance diode be realized wide piezo voltage range at different temperatures. We also discuss dependence rectification factor on temperatures couplings reservoirs. find higher temperature differences correspond larger...
The crucial limitation of improving the sensitivity detection weak magnetic fields is unavoidable measurement noise. In this paper, we propose a scheme to achieve precise sensing robust against additional noise by employing dual-frequency bias field modulation within cavity magnon system. We find that anti-rotating wave term can amplify signal detected field, but amplification effect must coexist with rotating term. particular, modulation, robustness thermal substantially enhanced, quantum...
We propose to expand the territory of density functional theory strongly-correlated electrons by reformulating Kohn-Sham ansatz in representation fractionalized particles. call it ''KS* ansatz''. Using inhomogeneous t-J chains as a test bed, we show that KS* with simple local approximtion is able achieve accurate ground state energy and distribution comparable matrix renormalization group method, while computational complexity much lower.