Publications (71)
Topological superconductivity and large spin Hall effect in the kagome family Ti6X4 (X = Bi, Sb, Pb, Tl, In)
Xin-Wei Yi, Zheng-Wei Liao, Jing-Yang You +2
Topological superconductors (TSC) become a focus of research due to the accompanying Majorana fermions. However, the experimentally reported TSC are extremely rare. The recent expe…
What determines the sign of the spin Hall effects in Cu alloys doped with 5d elements?
Zhuo Xu, Bo Gu, Michiyasu Mori +2
We perform a systematical analysis of the spin Hall effect (SHE) in the Cu alloys doped with a series of 5d elements, by the combined approach of density functional theory and Hart…
Joint Traffic Reshaping and Channel Reconfiguration in RIS-assisted Semantic NOMA Communications
Songhan Zhao, Yusi Long, Lanhua Li +3
In this paper, we consider a semantic-aware reconfigurable intelligent surface (RIS)-assisted wireless network, where multiple semantic users (SUs) simultaneously transmit semantic…
Bilateral hydrogenation induced high-Chern-number quantum anomalous Hall state in monolayer CrGeTe
Xiang Li, Xin-Wei Yi, Jing-Yang You +4
The pursuit of high-temperature quantum anomalous Hall (QAH) insulators faces fundamental challenges, including narrow topological gaps and low Curie temperatures () in existi…
Effects of the crystal structure on the ferromagnetic correlations in ZnO with magnetic impurities
Bo Gu, Nejat Bulut, Sadamichi Maekawa
We study the ferromagnetism in the compound (Zn,Mn)O within the Haldane-Anderson impurity model by using the quantum Monte Carlo technique and the tight-binding approximation for d…
Two-dimensional magnetic semiconductors with room Curie temperatures
Jing-Yang You, Zhen Zhang, Xue-Juan Dong +2
We propose two-dimensional (2D) Ising-type ferromagnetic semiconductors TcSiTe3, TcGeSe3, and TcGeTe3 with high Curie temperatures around 200-0500 K. Owing to large spin-orbit coup…
Diluted magnetic semiconductors with narrow band gaps
Bo Gu, Sadamichi Maekawa
We propose a method to realize diluted magnetic semiconductors (DMS) with p- and n-type carriers by choosing host semiconductors with a narrow band gap. By employing a combination…
Enhanced spin Hall effect by electron correlations in CuBi alloys
Bo Gu, Zhuo Xu, Michiyasu Mori +2
A recent experiment in CuBi alloys obtained a large spin Hall angle (SHA) of -0.24 (Niimi et al. Phys. Rev. Lett. 109, 156602 (2012)). We find that the SHA can be dramatically enha…
Generative Artificial Intelligence Assisted Multi-modal Semantic Extraction for NOMA-based Image Transmissions
Songhan Zhao, Shimin Gong, Bo Gu +4
In this paper, we investigate a generative artificial intelligence (GAI)-assisted semantic communication framework for non-orthogonal multiple access (NOMA)-based image transmissio…
Sign change of the spin Hall effect due to electron correlation in nonmagnetic CuIr alloys
Zhuo Xu, Bo Gu, Michiyasu Mori +2
Recently a positive spin Hall angle (SHA) of 0.021, was observed experimentally in nonmagnetic CuIr alloys [Niimi et al., Phys. Rev. Lett. 106, 126601 (2011)] and attributed predom…
Matching-Driven Deep Reinforcement Learning for Energy-Efficient Transmission Parameter Allocation in Multi-Gateway LoRa Networks
Ziqi Lin, Xu Zhang, Shimin Gong +3
Long-range (LoRa) communication technology, distinguished by its low power consumption and long communication range, is widely used in the Internet of Things. Nevertheless, the LoR…
New p- and n-type ferromagnetic semiconductors: Cr-doped BaZn2As2
Bo Gu, Sadamichi Maekawa
We find new ferromagnetic semiconductors, Cr-doped BaZn2As2, by employing a combined method of the density functional theory and the quantum Monte Carlo simulation. Due to a narrow…
Superconductivity in sodium-doped T-carbon
Jing-Yang You, Bo Gu, Gang Su
T-carbon has been proposed as a new carbon allotrope in 2011, which was successfully synthesized in recent experiments. Because of its fluffy structure, several kinds of atoms can…
Electric field induced topological phase transition and large enhancements of spin-orbit coupling and Curie temperature in two-dimensional ferromagnetic semiconductors
Jing-Yang You, Xue-Juan Dong, Bo Gu +1
Tuning topological and magnetic properties of materials by applying an electric field is widely used in spintronics. In this work, we find a topological phase transition from topol…
Family of binary transition metal pnictide superconductors
Zheng-Wei Liao, Xin-Wei Yi, Jing-Yang You +2
Superconductivity in transition metal nitrides (TMNs) has been investigated for a long time, such as zirconium nitride (ZrN) with a superconducting transition temperature Tc of 10…
Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy
Atsushi Okada, Shikun He, Bo Gu +9
Studies of magnetization dynamics have incessantly facilitated the discovery of fundamentally novel physical phenomena, making steady headway in the development of magnetic and spi…
Bayesian Optimization Enhanced Deep Reinforcement Learning for Trajectory Planning and Network Formation in Multi-UAV Networks
Shimin Gong, Meng Wang, Bo Gu +3
In this paper, we employ multiple UAVs coordinated by a base station (BS) to help the ground users (GUs) to offload their sensing data. Different UAVs can adapt their trajectories…
SpaceMind++: Toward Allocentric Cognitive Maps for Spatially Grounded Video MLLMs
Bo Gu, Zhikang Zhang, Zizhuang Wei +3
Recent multimodal large language models (MLLMs) have made remarkable progress in visual understanding and language-based reasoning, yet they lack a persistent world-centered repres…
Analysis of the spin Hall effect in CuIr alloys: Combined approach of density functional theory and Hartree-Fock approximation
Zhuo Xu, Bo Gu, Michiyasu Mori +2
We analyze the spin Hall effect in CuIr alloys in theory by the combined approach of the density functional theory (DFT) and Hartree-Fock (HF) approximation. The SHA is obtained to…
Emergent magnetic states due to stacking and strain in the van der Waals magnetic trilayer CrI3
Zhen Zhang, Jing-Yang You, Bo Gu +1
Recently, three different magnetic states were observed experimentally in trilayer CrI3 under pressure,including ferromagnetic (FM)-upupup, FM-downupdown and FM-upupdown. To reveal…
Spin PN Junctions: Giant Magnetoresistance, Tunable Circular Polarization, and Spin Zener Filter
Chun-Yi Xue, Gang Su, Bo Gu
We demonstrate that spin PN junctions-magnetic semiconductor homojunctions with spin splitting-induced band offsets-fundamentally redefine carrier transport via spin-dependent reco…
Ferroelectric control of bipolar magnetic semiconductor with room Curie temperature
Jia-Wen Li, Gang Su, Bo Gu
The development of room-temperature tunable magnetic semiconductors is crucial for the advancement of low-power, high-performance information technologies. Using density functional…
Quantum Renormalization of the Spin Hall Effect
Bo Gu, Jing-Yu Gan, Nejat Bulut +4
By quantum Monte Carlo simulation of a realistic multiorbital Anderson impurity model, we study the spin-orbit interaction (SOI) of an Fe impurity in Au host metal. We show, for th…
DRL-driven Online Optimization for Joint Traffic Reshaping and Channel Reconfiguration in RIS-assisted Semantic NOMA Communications
Songhan Zhao, Shimin Gong, Bo Gu +3
This paper explores a reconfigurable intelligent surface (RIS)-assisted and semantic-aware wireless network, where multiple semantic users (SUs) transmit semantic information to an…
Multiagent Reinforcement Learning with an Attention Mechanism for Improving Energy Efficiency in LoRa Networks
Xu Zhang, Ziqi Lin, Shimin Gong +2
Long Range (LoRa) wireless technology, characterized by low power consumption and a long communication range, is regarded as one of the enabling technologies for the Industrial Int…
P-orbital magnetic topological states on square lattice
Jing-Yang You, Bo Gu, Gang Su
Honeycomb or triangular lattices were extensively studied and thought to be proper platforms for realizing quantum anomalous Hall effect (QAHE), where magnetism is usually caused b…
Two-dimensional topological superconductivity candidate in van der Waals layered material
Jing-Yang You, Bo Gu, Gang Su +1
Two-dimensional (2D) topological superconductors are highly desired because they not only offer opportunities for exploring novel exotic quantum physics, but also possesses potenti…
AoI-aware Sensing Scheduling and Trajectory Optimization for Multi-UAV-assisted Wireless Backscatter Networks
Yusi Long, Songhan Zhao, Shimin Gong +4
This paper considers multiple unmanned aerial vehicles (UAVs) to assist sensing data transmissions from the ground users (GUs) to a remote base station (BS). Each UAV collects sens…
Cost- and Energy-Aware Multi-Flow Mobile Data Offloading Using Markov Decision Process
Cheng Zhang, Bo Gu, Zhi Liu +2
With the rapid increase in demand for mobile data, mobile network operators are trying to expand wireless network capacity by deploying wireless local area network (LAN) hotspots o…
Microscopic mechanism of high-temperature ferromagnetism in Fe, Mn, and Cr-doped InSb, InAs, and GaSb magnetic semiconductors
Jing-Yang You, Bo Gu, Sadamichi Maekawa +1
In recent experiments, high Curie temperatures Tc above room temperature were reported in ferromagnetic semiconductors Fe-doped GaSb and InSb, while low Tc between 20 K to 90 K wer…
Photoemission and X-ray Absorption Studies of the Diluted Magnetic Semiconductor BaK(ZnMn)As Isostructural to Fe-based Superconductors
H. Suzuki, K. Zhao, G. Shibata +14
The electronic and magnetic properties of a new diluted magnetic semiconductor (DMS) BaK(ZnMn)As, which is isostructural to so-called 122-ty…
Digital Twin Enabled Simultaneous Learning and Modeling for UAV-assisted Secure Communications with Eavesdropping Attacks
Jieting Yuan, Songhan Zhao, Ye Xue +3
This paper focuses on secure communications in UAV-assisted wireless networks, which comprise multiple legitimate UAVs (LE-UAVs) and an intelligent eavesdropping UAV (EA-UAV). The…
Kagome quantum anomalous Hall effect with high Chern number and large band gap
Zhen Zhang, Jing-Yang You, Xing-Yu Ma +2
Due to the potential applications in the low-power-consumption spintronic devices, the quantum anomalous Hall effect (QAHE) has attracted tremendous attention in past decades. Howe…
High Curie temperature in diluted magnetic semiconductors (B, Mn)X (X = N, P, As, Sb)
Xiang Li, Jia-Wen Li, Jing-Yang You +2
Doping nonmagnetic semiconductors with magnetic impurities is a feasible way to obtain diluted magnetic semiconductors (DMSs). It is generally accepted that for the most extensivel…
Enhanced Magneto-optical Kerr Effect at Fe/Insulator Interfaces
Bo Gu, Saburo Takahashi, Sadamichi Maekawa
Using density functional theory calculations, we have found an enhanced magneto-optical Kerr effect in Fe/insulator interfaces. The results of our study indicate that interfacial F…
Two-dimensional room temperature ferromagnetic semiconductors
Jia-Wen Li, Gang Su, Bo Gu
To realize ferromagnetic semiconductors with high Curie temperature TC is still a challenge in spintronics. Recent experiments have obtained two-dimensional (2D) room temperature f…
Great enhancement of Curie temperature and magnetic anisotropy in two-dimensional van der Waals magnetic semiconductor heterostructures
Xuejuan-Dong, Jingyang-You, Zheng Zhang +2
In two-dimensional (2D) magnetic systems, large magnetic anisotropy is needed to stabilize the magnetic order according to Mermin-Wagner theorem. Based on density functional theory…
Possible d0 ferromagnetism in MgO doped with nitrogen
Bo Gu, Nejat Bulut, Timothy Ziman +1
We study the possibility of d0 ferromagnetism in the compound MgO doped with nitrogen (N). The Haldane-Anderson impurity model is formulated within the tight-binding approximation…
Can We Enhance the Quality of Mobile Crowdsensing Data Without Ground Truth?
Jiajie Li, Bo Gu, Shimin Gong +2
Mobile crowdsensing (MCS) has emerged as a prominent trend across various domains. However, ensuring the quality of the sensing data submitted by mobile users (MUs) remains a compl…
Intercalation-Induced Near Room-Temperature Ferromagnetism in CrI3 via Synergistic Exchange Pathways
Qing-Han Yang, Jia-Wen Li, Xin-Wei Yi +4
The development of room-temperature magnetic semiconductors is critical for advancing spintronic technologies, yet van der Waals magnets like CrI3 exhibit intrinsically low Curie t…
Antiferromagnetic Ground State, Charge Density Waves and Oxygen Vacancies Induced Metal-Insulator Transition in Pressurized LaNiO
Xin-Wei Yi, Ying Meng, Jia-Wen Li +4
LaNiO has garnered widespread interest recently due to its high-temperature superconductivity under pressure, accompanied by charge density wave (CDW) ordering an…
Magnetic Properties and Electronic Configurations of Mn Ions in the Diluted Magnetic Semiconductor BaK(ZnMn)As Studied by X-ray Magnetic Circular Dichroism and Resonant Inelastic X-ray Scattering
H. Suzuki, G. Q. Zhao, J. Okamoto +18
The magnetic properties and the electronic excitations of the new diluted magnetic semiconductor BaK(ZnMn)As have been studied by x-ray magn…
Antiferromagnetic and Electric Polarized States in Two-Dimensional Janus Semiconductor Fe2Cl3I3
Zhen Zhang, Jing-Yang You, Bo Gu +1
Two-dimensional (2D) Janus semiconductors with mirror asymmetry can introduce novel properties, such as large spin-orbit coupling (SOC) and normal piezoelectric polarization, which…
Learning Joint Source-Channel Encoding in IRS-assisted Multi-User Semantic Communications
Haidong Wang, Songhan Zhao, Lanhua Li +4
In this paper, we investigate a joint source-channel encoding (JSCE) scheme in an intelligent reflecting surface (IRS)-assisted multi-user semantic communication system. Semantic e…
Diameter-Controlled High-Order Vortex States and Magnon Hybridization in VSe2 Nanotubes
Jia-Wen Li, Xin-Wei Yi, Jin Zhang +2
Curved magnets offer a rich phase diagram and hold great promise for next-generation spintronic technologies. This study establishes the paramount significance of high-order vortex…
Multi-Time Scale Service Caching and Pricing in MEC Systems with Dynamic Program Popularity
Yiming Chen, Xingyuan Hu, Bo Gu +2
In mobile edge computing systems, base stations (BSs) equipped with edge servers can provide computing services to users to reduce their task execution time. However, there is alwa…
Enhanced spin-orbit coupling and orbital moment in ferromagnets by electron correlations
Ze Liu, Jing-Yang You, Bo Gu +2
In atomic physics, the Hund rule says that the largest spin and orbital state is realized due to the interplay of the spin-orbit coupling (SOC) and the Coulomb interactions. Here,…
Strain-Induced Room-Temperature Ferromagnetic Semiconductors with Large Anomalous Hall Conductivity in Two-Dimensional Cr2Ge2Se6
Xue-Juan Dong, Jing-Yang You, Bo Gu +1
By density functional theory calculations, we predict a stable two-dimensional (2D) ferromagnetic semiconductor CrGeSe, where the Curie temperature can be drama…
A Deep Reinforcement Learning Based Approach for Cost- and Energy-Aware Multi-Flow Mobile Data Offloading
Cheng Zhang, Zhi Liu, Bo Gu +2
With the rapid increase in demand for mobile data, mobile network operators are trying to expand wireless network capacity by deploying wireless local area network (LAN) hotspots o…
Magnetism and Thermodynamics of Spin-1/2 Heisenberg Diamond Chains in a Magnetic Field
Bo Gu, Gang Su
The magnetic and thermodynamic properties of spin-1/2 Heisenberg diamond chains are investigated in three different cases: (a) J1, J2, J3>0 (frustrated); (b) J1, J3<0, J2>0 (frustr…
Fermi Surfaces and - Hybridization in the Diluted Magnetic Semiconductor BaK(ZnMn)As Studied by Soft X-ray Angle Resolved Photoemission Spectroscopy
H. Suzuki, G. Q. Zhao, K. Zhao +14
The electronic structure of the new diluted magnetic semiconductor BaK(ZnMn)As (, ) in single crystal form has been investig…
Flat Band and Hole-induced Ferromagnetism in a Novel Carbon Monolayer
Jing-Yang You, Bo Gu, Gang Su
In recent experiments, superconductivity and correlated insulating states were observed in twisted bilayer graphene (TBG) with small magic angles, which highlights the importance o…
Unifying Strain-driven and Pressure-driven Superconductivity in LaNiO: Suppressed charge/spin density waves and enhanced interlayer coupling
Xin-Wei Yi, Wei Li, Jing-Yang You +2
Recent strain-stabilized superconductivity at ambient pressure in LaNiO films opens new avenues for nickelates research, in parallel with its pressure-induced counter…
Learning to Optimize Joint Source and RIS-assisted Channel Encoding for Multi-User Semantic Communication Systems
Haidong Wang, Songhan Zhao, Bo Gu +3
In this paper, we explore a joint source and reconfigurable intelligent surface (RIS)-assisted channel encoding (JSRE) framework for multi-user semantic communications, where a dee…
High temperature ferrimagnetic semiconductors by spin-dependent doping in high temperature antiferromagnets
Jia-Wen Li, Gang Su, Bo Gu
To realize room temperature ferromagnetic (FM) semiconductors is still a challenge in spintronics. Many antiferromagnetic (AFM) insulators and semiconductors with high Neel tempera…
Observation of Flat Band, Dirac Nodal Lines and Topological Surface States in Kagome Superconductor CsTiBi
Jiangang Yang, Yuyang Xie, Zhen Zhao +23
A kagome lattice of 3d transition metals hosts flat bands, Dirac fermions and saddle points. It provides a versatile platform for achieving topological superconductivity, anomalous…
Thermodynamics of Spin-1/2 AF-AF-F and F-F-AF Trimerized Quantum Heisenberg Chains
Bo Gu, Gang Su, Song Gao
The magnetization process, the susceptibility and the specific heat of the spin-1/2 AF-AF-F and F-F-AF trimerized quantum Heisenberg chains have been investigated by means of the t…
Hierarchical Deep Reinforcement Learning for Age-of-Information Minimization in IRS-aided and Wireless-powered Wireless Networks
Shimin Gong, Leiyang Cui, Bo Gu +3
In this paper, we focus on a wireless-powered sensor network coordinated by a multi-antenna access point (AP). Each node can generate sensing information and report the latest info…
Two-dimensional Heisenberg models with materials-dependent superexchange interactions
Jia-Wen Li, Zhen Zhang, Jing-Yang You +2
The two-dimensional (2D) van der Waals ferromagnetic semiconductors, such as CrI and CrGeTe, and the 2D ferromagnetic metals, such as FeGeTe and MnSe, h…
Spin treacle in a frustrated magnet observed with spin current
Hiroki Taniguchi, Mori Watanabe, Takashi Ibe +8
By means of spin current, the flow of spin angular momentum, we find a regime of "spin treacle" in a frustrated magnetic system. To establish its existence, we have performed spin…
Room temperature ferromagnetic semiconductors through metal-semiconductor transition in monolayer MnSe2
Jia-Wen Li, Gang Su, Bo Gu
To realize room temperature ferromagnetic semiconductors is still a challenge in spintronics. Recent experiments have obtained two-dimensional (2D) room temperature ferromagnetic m…
Enhanced superconductivity in C-S-H compounds at high pressure
Zheng-Wei Liao, Zhen Zhang, Jing-Yang You +2
Recently, the superconducting transition temperature Tc = 287 K has been experimentally obtained in the material composed of carbon, sulfur, and hydrogen under the high pressure of…
Spin structure factors and valence-bond-solid states of the trimerized Heisenberg chains in a magnetic field
Shou-Shu Gong, Bo Gu, Gang Su
By means of the density matrix renormalization group (DMRG) method, the static spin structure factors and the magnetization plateaus of the trimerized Heisenberg ferromagnet-ferrom…
Exploiting NOMA Transmissions in Multi-UAV-assisted Wireless Networks: From Aerial-RIS to Mode-switching UAVs
Songhan Zhao, Shimin Gong, Bo Gu +4
In this paper, we consider an aerial reconfigurable intelligent surface (ARIS)-assisted wireless network, where multiple unmanned aerial vehicles (UAVs) collect data from ground us…
Superconducting, topological and transport properties of kagome metals CsTiBi and RbTiBi
Xin-Wei Yi, Zheng-Wei Liao, Jing-Yang You +2
The recently discovered ATiBi (A=Cs, Rb) exhibit intriguing quantum phenomena including superconductivity, electronic nematicity, and abundant topological states, which pro…
Superconducting and topological properties of compound LuHN
Zheng-Wei Liao, Xin-Wei Yi, Jing-Yang You +2
A recent experiment has reported a nitrogen-doped lutetium hydride acheving a remarkable Tc of 294 K at just 1 GPa, significantly reducing the required pressure for obtaining room…
Two-Dimensional Room Temperature Ferromagnetic Semiconductors with Quantum Anomalous Hall Effect
Jing-Yang You, Zhen Zhang, Bo Gu +1
To obtain room temperature ferromagnetic semiconductors is one of big challenges in science, and also premises essentially to realize room temperature quantum anomalous Hall effect…
SA-RA-JSCC: SNR-Adaptive and Semantic-Rate-Aware Joint Source-Channel Coding
Shitong Zhang, Yaping Sun, Hao Chen +4
In joint source-channel coding (JSCC)-based semantic communication systems, achieving stable and reliable image semantic transmission under channel constraints remains a key challe…
Enhancement of temperature of quantum anomalous Hall effect in two-dimensional germanene/magnetic semiconductor heterostructures
Qing-Han Yang, Jia-Wen Li, Xin-Wei Yi +4
Quantum anomalous Hall effect (QAHE) is significant for future low-power electronics devices, where a main challenge is realizing QAHE at high temperatures. In this work, based on…
Ferromagnetic Semiconductor Nanotubes with Room Curie Temperatures
Jia Wen Li, Gang Su, Bo Gu
Realizing ferromagnetic semiconductors with room Curie temperature remains a challenge in spintronics. Inspired by the recent experimental progress on the nanotubes based…
Magnetic Properties of J-J-J' Quantum Heisenberg Chains with Spin S=1/2, 1, 3/2 and 2 in a Magnetic Field
Bo Gu, Gang Su, Song Gao
By means of the density matrix renormalization group (DMRG) method, the magnetic properties of the J-J-J quantum Heisenberg chains with spin , 1, 3/2 and 2 in the…