Publications (25)
Theory of magnetic excitons in the heavy-fermion superconductor
Jun Chang, I. Eremin, P. Thalmeier +1
We analyze the influence of unconventional superconductivity on the magnetic excitations in the heavy fermion compound UPdAl. We show that it leads to the formation of a bo…
Novel Valence Transition in Elemental Metal Europium around 80 GPa
Bijuan Chen, Mingfeng Tian, Jurong Zhang +20
Valence transition could induce structural, insulator-metal, nonmagnetic-magnetic and superconducting transitions in rare-earth metals and compounds, while the underlying physics r…
Theory of dual fermion superconductivity in hole-doped cuprates
Jun Chang, Jize Zhao
Since the discovery of the cuprate high-temperature superconductivity in 1986, a universal phase diagram has been constructed experimentally and numerous theoretical models have be…
Ultrafast intersystem crossing in nickel porphyrins
Javier Fernandez-Rodriguez, Jun Chang, Arthur J. Fedro +1
We study the relaxation dynamics and intersystem-crossing to the metastable state in laser-pumped tetra and hexa-coordinated nickel porphyrins. We use a ligand-field model which ta…
Superconductivity in -pyrochlore superconductor KOsO: treatment within strong-coupling Eliashberg theory
Jun Chang, Ilya Eremin, Peter Thalmeier
We study the influence of the rattling phonons on superconductivity in -pyrochlore KOsO compound based on the strong-coupling Eliashberg approach. In particular, an…
Model of Nonadiabatic to Adiabatic Dynamical Quantum Phase Transition in Photoexcited Systems
Jun Chang, Ilya Eremin, Jize Zhao
We study the ultrafast dynamic process in photoexcited systems and find that the Franck-Condon or Landau-Zener tunneling between the photoexcited state and the ground state is abru…
A probability-conserving dissipative Schrödinger equation
Michel van Veenendaal, Jun Chang, A. J. Fedro
Dissipative effects on a microscopic level are included in the Schrödinger equation. When the decay between different local levels as a result of the coupling to a bath, the SchrÅ
3D Lane Detection from Front or Surround-View using Joint-Modeling & Matching
Haibin Zhou, Huabing Zhou, Jun Chang +2
3D lanes offer a more comprehensive understanding of the road surface geometry than 2D lanes, thereby providing crucial references for driving decisions and trajectory planning. Wh…
Ultrafast Cascading Theory in Intersystem Crossings in Transition-Metal Complexes
Jun Chang, A. J. Fedro, Michel van Veenendaal
We investigate the cascade decay mechanism for ultrafast intersystem crossing mediated by the spin-orbit coupling in transition-metal complexes. A quantum-mechanical description of…
Novel Superstructure-Phase Two-Dimensional Material 1-VSe at High Pressure
Raimundas Sereika, Changyong Park, Curtis Kenney-Benson +11
A superstructure can elicit versatile new properties of materials by breaking their original geometrical symmetries. It is an important topic in the layered graphene-like two-dimen…
Single-stage Rotate Object Detector via Two Points with Solar Corona Heatmap
Beihang Song, Jing Li, Shan Xue +4
Oriented object detection is a crucial task in computer vision. Current top-down oriented detection methods usually directly detect entire objects, and not only neglecting the auth…
RGAT: A Deeper Look into Syntactic Dependency Information for Coreference Resolution
Yuan Meng, Xuhao Pan, Jun Chang +1
Although syntactic information is beneficial for many NLP tasks, combining it with contextual information between words to solve the coreference resolution problem needs to be furt…
Universal Anomaly of Dynamics at Phase Transition Points Induced by Pancharatnam-Berry Phase
Jia-Yuan Zhang, Xia Yin, Ming-Yu liu +3
Recently, dynamical anomalies more than critical slowing down are often observed near both the continuous and first-order phase transition points. We propose that the universal ano…
Hund-Heisenberg model in superconducting infinite-layer nickelates
Jun Chang, Jize Zhao, Yang Ding
We theoretically investigate the unconventional superconductivity in the newly discovered infinite-layer nickelates NdSrNiO based on a two-band model. By analyz…
Model of ultrafast demagnetization driven by spin-orbit coupling in a photoexcited antiferromagnetic insulator Cr2O3
Feng Guo, Na Zhang, Wei Jin +1
We theoretically study the dynamic time evolution following laser pulse pumping in an antiferromagnetic insulator CrO. From the photoexcited high-spin quartet states to…
Ultrafast Electron Dynamics Theory of Photo-excited Ruthenium Complexes
Jun Chang, A. J. Fedro, Michel van Veenendaal
An explanation is provided for the ultrafast photo-excited electron dynamics in low-spin Ruthenium (II) organic complexes. The experimentally-observed singlet to triplet decay in t…
Robust superconducting correlation against inter-site interactions in the extended two-leg Hubbard ladder
Zongsheng Zhou, Weinan Ye, Hong-Gang Luo +2
The Hubbard and related models serve as a fundamental starting point in understanding the novel experimental phenomena in correlated electron materials, such as superconductivity,…
Eliashberg theory of superconductivity and inelastic rare-earth impurity scattering in filled skutterudite LaPrOsSb
Jun Chang, Ilya Eremin, Peter Thalmeier +1
We study the influence of inelastic rare-earth impurity scattering on electron-phonon mediated superconductivity and mass renormalization in (LaPr)OsSb c…
The evolution of magnetic structure driven by a synthetic spin-orbit coupling in two-component Bose-Hubbard model
Jize Zhao, Shijie Hu, Jun Chang +3
We study the evolution of magnetic structure driven by a synthetic spin-orbit coupling in a one-dimensional two-component Bose-Hubbard model. In addition to the Mott insulator-supe…
Energy Dispersion, Superconductivity and Magnetic Fluctuations in Stacked Altermagnetism Materials
Jun Chang, Hantao Lu, Jize Zhao +2
Recently, altermagnetism (AM) has emerged as a new category of magnetism, alongside conventional antiferromagnetism (AFM) and ferromagnetism (FM). In an AM, superconductivity (SC)…
Study of quantum Otto heat engine using driven-dissipative Schrödinger equation
You-wei Fang, Yu-ting Zheng, Jun Chang
The quantum heat engines have drawn much attention due to miniaturization of devices recently. We study the dynamics of the quantum Otto heat engine using the driven-dissipative Sc…
Lattice frustration in spin-orbit Mott insulator Sr3Ir2O7 at high pressure
Jianbo Zhang, Dayu Yan, Sorb Yesudhas +13
The intertwined charge, spin, orbital, and lattice degrees of freedom could endow 5d compounds with exotic properties. Current interest is focused on electromagnetic interactions i…
Ferromagnetism in a two-component Bose-Hubbard model with a synthetic spin-orbit coupling
Jize Zhao, Shijie Hu, Jun Chang +2
We study the effect of the synthetic spin-orbit coupling in a two-component Bose-Hubbard model in one dimension by employing the density-matrix renormalization group method. A ferr…
Fast Intersystem Crossing in Transition-Metal Complexes
Michel van Veenendaal, Jun Chang, A. J. Fedro
The mechanism behind fast intersystem crossing in transition-metal complexes is shown to be a result of the dephasing of the photoexcited state to the phonon continuum of a differe…
Anisotropic superexchange through nonmagnetic anions with spin-orbit coupling
Jun Chang, Jize Zhao, Yang Ding
Anisotropic superexchange interaction is one of the most important interactions in realizing exotic quantum magnetism, which is traditionally regarded to originate from magnetic io…