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Yu-Hsin Su

National Taiwan University

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Ching‐Ray Chang

National Taiwan University

Son-Hsien Chen

University of Taipei

Chien‐Liang Chen

National Yang Ming Chiao Tung University

Kuo-Wei Chen

National Taiwan University Hospital

Beluvalli E. Prasad

Max Planck Institute for Chemical Physics of Solids

Claudia Felser

Max Planck Institute for Chemical Physics of Solids

Thomas Doert

TU Dresden

Martin Jansen

Max Planck Institute for Solid State Research

Gohil S. Thakur

Max Planck Institute for Chemical Physics of Solids

Yan Sun

Max Planck Institute for Chemical Physics of Solids

Cooperative Institutions

National Taiwan University

Beijing Institute of Technology

Max Planck Institute for Chemical Physics of Solids

Korea Basic Science Institute

Chinese Academy of Sciences

Max Planck Society

Universität der Bundeswehr München

Chung Yuan Christian University

National Yang Ming Chiao Tung University

National Sun Yat-sen University

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Competition between spin–orbit interaction and exchange coupling within a honeycomb lattice ribbon

Journal of Physics D Applied Physics (2015)

Yu-Hsin Su Son-Hsien Chen C. D. Hu Ching‐Ray Chang

Abstract Spin density patterns of a pinned magnetic impurity that is embedded in a honeycomb lattice with zigzag edges are investigated by employing a mean-field assisted Landauer–Keldysh formalism. Both the intrinsic spin–orbit coupling and the extrinsic localized magnetic moments are considered, and the effects of the pinning directions and the species of the sublattice on the electron spins are analyzed. A local time-reversal symmetry breaking cannot destroy the equilibrium edge-state spin accumulation that is induced by intrinsic spin–orbit coupling when the pinning field lies in the plane of the ribbon and the embedding position is the A-site at the edge. The induced local spin can be either parallel or antiparallel to the localized impurity moment, depending on the location of the pinned impurity, because itinerant electrons are found only at the B-site of the edge, but not at the A-site.

Ribbon

Spin–orbit interaction

Zigzag

10.1088/0022-3727/49/1/015305

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Citations (24)

Schwarz–Christoffel Transformation for Cladding Conducting Lines

IEEE Transactions on Magnetics (2009)

Yu-Hsin Su Jyh-Shinn Yang Ching‐Ray Chang

We present an application of the conformal mapping methods to determine the magnetic field from the magnetic clad line. Making use of the Schwarz-Christoffel (S-C) transformation, we derive the expression for the magnetic field in such configuration, conveniently used to study the spatial feature of the magnetic field. The calculated results show that there is a threshold ratio for appearance of the plateau and the effect of the finite poles and structure parameters on the field distribution. Finally, an optimal geometry for the magnetic clad line is qualitatively concluded.

Christoffel symbols

Cladding (metalworking)

10.1109/tmag.2009.2022840

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Charge density waves and degenerate modes in exfoliated monolayer 2H-TaS₂

Duan Zhang Yecun Wu Yu-Hsin Su Ming-Chien Hsu Cormac Ó Coileáin

Charge density waves spontaneously breaking lattice symmetry through periodic lattice distortion, and electron–electron and electron–phonon interactions, can lead to a new type of electronic band structure. Bulk 2H-TaS 2 is an archetypal transition metal dichalcogenide supporting charge density waves with a phase transition at 75 K. Here, it is shown that charge density waves can exist in exfoliated monolayer 2H-TaS 2 and the transition temperature can reach 140 K, which is much higher than that in the bulk. The degenerate breathing and wiggle modes of 2H-TaS 2 originating from the periodic lattice distortion are probed by optical methods. The results open an avenue to investigating charge density wave phases in two-dimensional transition metal dichalcogenides and will be helpful for understanding and designing devices based on charge density waves.

Charge Density Wave

Charge density

Lattice (music)

10.1107/s2052252520011021

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Planarization, Fabrication, and Characterization of Three-Dimensional Magnetic Field Sensors

IEEE Transactions on Nanotechnology (2017)

Van Su Luong Yu-Hsin Su Chih‐Cheng Lu Jen-Tzong Jeng Jen‐Hwa Hsu

Nanomagnetism deals with magnetic phenomena in nanoscale structures, involving processes at the atomic level. Magnetic sensors, which exhibit the surprising giant magnetoresistance (GMR) effect, are some of the first real applications of nanotechnology, and have become very important in the last two decades. In addition, high-performance magnetoresistance (MR) measurement is a critical technique in modern electrical applications, including electronic compasses, aviation navigation, motion tracking, noncontact current sensing, rotation sensing, and vehicle detection. Both GMR and tunneling magnetoresistance (TMR) sensors have been used in the state-of-art electronic compasses. A new planar design layout of a vector magnetometer is proposed in this report. It can sense variations in three-dimensional (3-D) magnetic fields. The planarization of a vector magnetometer is carried out with consideration of materials, magnetic schematics, as well as transducer circuit designs. The optimization of an advanced magnetic material for use in GMR and TMR sensors and its planarization in a 3-D design are crucial practical issues. This paper presents an overview of the planarization of vector magnetometers and the development of its applications. It focuses on recent works, covers an analytic model of magnetoresistive sensors, and methods of thin film fabrication. It also addresses the planar vector magnetometer with a flux-guide, the chopping technique, and techniques for microfabrication of substrates. Planarization in magnetic sensors will become increasingly exploited as nanomagnetism grows in importance.

Chemical Mechanical Planarization

10.1109/tnano.2017.2660062

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Citations (27)

Spin-orbit force in graphene with Rashba spin-orbit coupling

Journal of Applied Physics (2012)

Chien‐Liang Chen Yu-Hsin Su Ching‐Ray Chang

The observation of Rashba spin splitting in graphene on the Ni (111) substrate, motivates the studies to manipulate electron spin via Rashba spin-orbit coupling in graphene. We derive the effective spin-orbit force in Rashba coupled graphene from the Heisenberg equation of motion. The spin-orbit force, different from that in conventional semiconductors, can provide us a physical picture of unusual spin separation due to Rashba spin-orbit coupling in graphene. Finally, we numerically calculate spin Hall conductance and qualitatively explain the result by the spin-orbit force picture in graphene.

Spin–orbit interaction

Rashba effect

Orbit (dynamics)

10.1063/1.3678488

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Na2Bi5AuO11 revisited

Materials Research Bulletin (2019)

Gohil S. Thakur Beluvalli E. Prasad Thomas Doert Yu-Hsin Su Yan Sun

Orthorhombic crystal system

10.1016/j.materresbull.2019.110534

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Spin flip of a single anisotropic magnetic impurity in four-terminal Landauer setup with Rashba spin-orbit coupling

Journal of Applied Physics (2011)

Yu-Hsin Su Son-Hsien Chen Kuo-Wei Chen Chien‐Liang Chen Ching‐Ray Chang

The mean-field-assisted Landauer–Keldysh formalism is employed to study the flip of an impurity spin under a uniaxial anisotropic field in two-dimensional electron gas with Rashba spin-orbit coupling. The spin-flip process with uniaxial anisotropic axis set to three different directions is investigated in a four-terminal Landauer setup. We show that the spin flip follows a three-dimensional trajectory rather than in-plane motion. As bias voltage changes sign, the impurity spin will flip from one saturated state to another and move along a different trajectory, depending on the chosen initial saturated state.

Spin–orbit interaction

10.1063/1.3560008

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Citations (2)

CSD 1886557: Experimental Crystal Structure Determination

The Cambridge Structural Database (2019)

Gohil S. Thakur Beluvalli E. Prasad Thomas Doert Yu-Hsin Su Yan Sun

An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the joint CCDC and FIZ Karlsruhe Access Structures service and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.25505/fiz.icsd.cc21b3p6

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Spin stability and magnetic screening of a magnetic impurity in four-terminal Landauer setup with Rashba spin-orbit coupling

Journal of Applied Physics (2012)

Yu-Hsin Su Chien‐Liang Chen Kuo-Wei Chen Ching‐Ray Chang

The mean-field-assisted Landauer-Keldysh formalism is employed to study the orientation of a magnetic impurity embedded in two-dimensional electron gas with Rashba spin-orbit coupling. Interesting physics arises about the stability of the impurity spin. The spin of Rashba electrons interacting with magnetic impurity spin has two steady states, while the stable or unstable state depends on the local charge current and the exchange coupling strength between the local impurity spin and itinerant electrons. Furthermore, the stable steady state of impurity spin gives rise to an interesting phenomenon, magnetic screening effect in a 2DEG system.

Magnetic impurity

Spin–orbit interaction

10.1063/1.3683246

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師共以反共:國民黨文藝政策之變遷(1924-1956)

Yu-Hsin Su 蘇郁欣

本文考察國民黨文藝制度自1924年至1956年間經歷「學共產黨」開始從而花費數十年時間在「反共產黨」的歷史變遷過程。過往的國民黨文藝政策研究，多關注戰後遷臺的時期，因此也傾向觀察到國民黨堅決反共的文藝政策。然而，若將國民黨文藝工作的時間尺度拉長、組織尺度拉深，可觀察到國民黨文藝制度有幾個變異頗大的不同階段。本文採用歷史制度論為研究框架，區分文藝制度、文藝組織、文藝政策三個不同層次的研究對象，以國民黨的文藝組織為主要焦點，但向上探討組織所存在的制度環境、向下分析文藝組織運作的文藝政策。由以上的分析框架，本文主張，必須由一九二〇年代國民黨與共產黨的合作關係談起，才能知悉國民黨如何在僵化的制度環境下、啟動「以共為師」的組織技術，從而在數十年間展開難以匹敵共產黨的反共文藝政策，直至一九六〇年代才有所轉型。循此，國民黨文藝制度歷史可分解為三個主要階段來觀察：（一）強審查弱組織的階段：1920年代國民黨在蘇聯的指導下認識文藝的政治影響力，但仍侷限於政治宣傳的作法；相對於共產黨的全面新創文藝黨團組織，國民黨的文藝政策是置於「政治制度」附屬之下，而未能在國民黨內發展出有力的官方文藝組織；（二）文藝組織整合的階段：抗戰期間，國民黨仍繼續維持文藝作品的政治審查，以防杜共產黨勢力入侵，但已試著利用文藝組織攏絡、收編左翼文藝工作者，並在抗戰末期首次成立了對抗共產黨的文藝組織，只是在國共內戰仍不敵共產黨的文藝操作能力進而在宣傳工作上失利；（三）文藝組織戰爭的階段：國民黨遷台後，意外得到免於直接面對共產黨的制度環境，而在重啟戰爭氛圍的需求下、延續了抗戰期間未竟的文藝組織工程，並在此時完備了官方文藝組織、強化敵我對立的分化──此種反共文學品味展現出「敵我廝殺」的單調敘事，卻也因為1950年代中期國民黨接觸到「美援」的文藝制度，急速在1960年代由「現代主義」帶出「冷靜自制」的反共文學新品味，告別糾纏國民黨數十年的「師共以反共」之文藝鬥爭史。

10.6342/ntu202004073

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