Tianyi Zhang

Tel Aviv University

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Co-Authors

Mauricio Terrones

Pennsylvania State University

Kazunori Fujisawa

Pennsylvania State University

Yuebing Zheng

The University of Texas at Austin

Ethan Kahn

NYU Langone Health

Ana Laura Elías

Binghamton University

Andrea Alù

The University of Texas at Austin

Jing Kong

Massachusetts Institute of Technology

Mingsong Wang

Jiangsu University

Fu Zhang

Pennsylvania State University

He Liu

Nanjing University of Information Science and Technology

Cooperative Institutions

Chinese Academy of Sciences

276

University of Chinese Academy of Sciences

133

Tsinghua University

122

Pennsylvania State University

119

Peking University

119

Zhejiang University

109

Sun Yat-sen University

Xi'an Jiaotong University

Shanghai Jiao Tong University

Huazhong University of Science and Technology

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Voltage-Controlled Magnon Transistor via Tunning Interfacial Exchange Coupling

arXiv (Cornell University) (2023)

Yizhan Wang Tianyi Zhang Jing Dong Peng Chen Caihua Wan

Magnon transistors that can effectively regulate magnon transport by an electric field are desired for magnonics which aims to provide a Joule-heating free alternative to the conventional electronics owing to the electric neutrality of magnons (the key carriers of spin-angular momenta in the magnonics). However, also due to their electric neutrality, magnons have no access to directly interact with an electric field and it is thus difficult to manipulate magnon transport by voltages straightforwardly. Here, we demonstrated a gate voltage ($V_{\rm g}$) applied on a nonmagnetic metal/magnetic insulator (NM/MI) interface that bended the energy band of the MI and then modulated the possibility for conduction electrons in the NM to tunnel into the MI can consequently enhance or weaken the spin-magnon conversion efficiency at the interface. A voltage-controlled magnon transistor based on the magnon-mediated electric current drag (MECD) effect in a Pt/Y$_{\rm 3}$Fe$_{\rm 5}$O$_{\rm 12}$ (YIG)/Pt sandwich was then experimentally realized with $V_{\rm g}$ modulating the magnitude of the MECD signal. The obtained efficiency (the change ratio between the MECD voltage at $\pm V_{\rm g}$) reached 10%/(MV/cm) at 300 K. This prototype of magnon transistor offers an effective scheme to control magnon transport by a gate voltage.

Magnon

Magnonics

10.48550/arxiv.2301.05592

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Dark‐Exciton‐Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS ₂ at Room Temperature

Small (2019)

Mingsong Wang Zilong Wu Alex Krasnok Tianyi Zhang Mingzu Liu

Abstract Strong spatial confinement and highly reduced dielectric screening provide monolayer transition metal dichalcogenides with strong many‐body effects, thereby possessing optically forbidden excitonic states (i.e., dark excitons) at room temperature. Herein, the interaction of surface plasmons with dark excitons in hybrid systems consisting of stacked gold nanotriangles and monolayer WS 2 is explored. A narrow Fano resonance is observed when the hybrid system is surrounded by water, and the narrowing of the spectral Fano linewidth is attributed to the plasmon‐enhanced decay of dark K ‐ K excitons. These results reveal that dark excitons in monolayer WS 2 can strongly modify Fano resonances in hybrid plasmon–exciton systems and can be harnessed for novel optical sensors and active nanophotonic devices.

Fano resonance

Nanophotonics

Laser linewidth

10.1002/smll.201900982

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Citations (27)

Investigation on the hydrogen induced cracking behaviour of heat-treated pipeline steel

Engineering Failure Analysis (2023)

Tianyi Zhang Zhenyu Chen Kaiyang Li Naiqiang Zhang

Elongation

Tensile testing

10.1016/j.engfailanal.2023.107909

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Citations (2)

Research on power system stability control data storage and management technology based on blockchain

2018 IEEE 4th Information Technology and Mechatronics Engineering Conference (ITOEC) (2023)

Jin Yifang Dong Liu Sheng Liu Tianyi Zhang

In view of the problems existing in the current stability control system control mode, such as low work efficiency, difficulty in tracing the process, difficulty in online supervision and data updating, the blockchain technology is embedded in the stability control system control framework. Utilizing the advantages of blockchain technology, the data information involved in each stage of the stability control system control process is blockized, encapsulated and distributed, making the key data information traceable and tamper proof, thus realizing the storage and sharing of stability control data. In this paper, the technical architecture, network architecture and storage architecture of the stability control chain are designed to realize the storage management of the stability control data on the chain, which improves the intelligent and automatic level of the stability control system control.

Data Sharing

Distributed data store

Tracing

10.1109/itoec57671.2023.10291464

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Even Faster (Δ + 1)-Edge Coloring via Shorter Multi-Step Vizing Chains

Society for Industrial and Applied Mathematics eBooks (2025)

Sayan Bhattacharya Martín Costa Shay Solomon Tianyi Zhang

Vizing's Theorem from 1964 states that any n-vertex m-edge graph with maximum degree Δ can be edge colored using at most Δ + 1 colors. For over 40 years, the state-of-the-art running time for computing such a coloring, obtained independently by Arjomandi [1982] and by Gabow, Nishizeki, Kariv, Leven and Terada [1985], was . Very recently, this time bound was improved in two independent works, by Bhattacharya, Carmon, Costa, Solomon and Zhang to , and by Assadi to Õ (n2).

Edge Coloring

Zhàng

Brooks' theorem

10.1137/1.9781611978322.167

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Analysis of Electromagnetic Shielding Effectiveness of Metallized Aramid Paper Honeycomb Structures

2021 13th International Symposium on Antennas, Propagation and EM Theory (ISAPE) (2024)

Dan Wang Le Cao Tianyi Zhang Xuqing Liu

Aramid

Honeycomb

Honeycomb structure

10.1109/isape62431.2024.10840488

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Practical and Efficient Utilisation of (R)-3-chloro-1,2-Propanediol in Synthesis of L-Carnitine

Journal of Chemical Research (2011)

Yunxu Yang Weili Wang Aikeremu Wumaier Ruilong Sheng Xuetao Zhang

As a by-product originating from Salen Co(III) catalysed hydrolytic kinetic resolution (HKR) of (±)-epichlorohydrin in the manufacturing procedure of L-Carnitine, ( R)-3-chloro-1,2-propanediol was utilised as a starting chiral material to prepare via key nitrile intermediates and by a final hydrolysis L-Carnitine. The new synthetic approach demonstrated an efficient utilisation of the by-product.

Kinetic resolution

Epichlorohydrin

Propanediol

1,3-Propanediol

10.3184/174751911x13090786031880

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Channel Estimation and Projection for RIS-assisted MIMO Using Zadoff-Chu Sequences

arXiv (Cornell University) (2022)

Xuemeng Zhou Zhiyu Yang Tianyi Zhang Yi Jiang

The reconfigurable intelligent surface (RIS) technology is a promising enabler for millimeter wave (mmWave) wireless communications, as it can potentially provide spectral efficiency comparable to the conventional massive multiple-input multiple-output (MIMO) but with significantly lower hardware complexity. In this paper, we focus on the estimation and projection of the uplink RIS-aided massive MIMO channel, which can be time-varying. We propose to let the user equipments (UE) transmit Zadoff-Chu (ZC) sequences and let the base station (BS) conduct maximum likelihood (ML) estimation of the uplink channel. The proposed scheme is computationally efficient: it uses ZC sequences to decouple the estimation of the frequency and time offsets; it uses the space-alternating generalized expectation-maximization (SAGE) method to reduce the high-dimensional problem due to the multipaths to multiple lower-dimensional ones per path. Owing to the estimation of the Doppler frequency offsets, the time-varying channel state can be projected, which can significantly lower the overhead of the pilots for channel estimation. The numerical simulations verify the effectiveness of the proposed scheme.

Spectral Efficiency

10.48550/arxiv.2202.10038

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Citations (1)

A Scaling Algorithm for Weighted $f$-Factors in General Graphs

arXiv (Cornell University) (2020)

Ran Duan Haoqing He Tianyi Zhang

We study the maximum weight perfect $f$-factor problem on any general simple graph $G=(V,E,w)$ with positive integral edge weights $w$, and $n=|V|$, $m=|E|$. When we have a function $f:V\rightarrow \mathbb{N}_+$ on vertices, a perfect $f$-factor is a generalized matching so that every vertex $u$ is matched to $f(u)$ different edges. The previous best algorithms on this problem have running time $O(m f(V))$ [Gabow 2018] or $\tilde{O}(W(f(V))^{2.373}))$ [Gabow and Sankowski 2013], where $W$ is the maximum edge weight, and $f(V)=\sum_{u\in V}f(u)$. In this paper, we present a scaling algorithm for this problem with running time $\tilde{O}(mn^{2/3}\log W)$. Previously this bound is only known for bipartite graphs [Gabow and Tarjan 1989]. The running time of our algorithm is independent of $f(V)$, and consequently it first breaks the $\Omega(mn)$ barrier for large $f(V)$ even for the unweighted $f$-factor problem in general graphs.

Weight function

10.48550/arxiv.2003.07589

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Citations (1)

Correction: An electrodeposited superaerophobic nickel catalyst on pencil-drawn paper: a novel approach for highly efficient and stable hydrogen evolution

Inorganic Chemistry Frontiers (2024)

Qian Sun Xiaoyu Hao Tianyi Zhang Zelin Ma Kui Hu

Correction for ‘An electrodeposited superaerophobic nickel catalyst on pencil-drawn paper: a novel approach for highly efficient and stable hydrogen evolution’ by Qian Sun et al. , Inorg. Chem. Front. , 2024, https://doi.org/10.1039/D4QI00101J.

Pencil (optics)

10.1039/d4qi90035a

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Citations (1)