• HOME
  • >
  • 소식
  • >
  • 세미나
장소 Zoom webinar 
일시 May. 13 (Fri.), 02:30 PM 
연사 Dr. Kun-Rok Jeon(Department of Physics, Chung-Ang University) 

SRC Seminar



Topological Superconducting Spintronics Towards Zero-Power Computing Technologies


Dr. Kun-Rok Jeon

Department of Physics, Chung-Ang University


May. 13 (Fri.), 02:30 PM
회의 ID: 883 2392 2428

암호: 839974


Semiconductor (SC) spintronics [1-4] aims to integrate memory and logic functions into a single device. Ferromagnetic tunnel contacts have emerged as a robust and technically viable method to inject spin current into a SC up to room temperature, and to detect it [3-7]. Intriguingly, it has been established that the spin current in ferromagnetic tunnel contacts can be created by thermal means (driven by a heat flow), namely Seebeck spin tunneling [8]. So far, the creation of thermal spin current relies on the spin-dependent energy dispersion of electronic states around the Fermi energy (EF), which determines thermoelectric properties. In the first part of my talk, I will describe a conceptually new approach to tailor the thermal spin current in ferromagnetic tunnel contacts to SCs exploiting spin-dependent thermoelectric properties away from EF through the application of a bias voltage across the tunnel contact [9,10].

Combining superconductivity with spintronics brings in a variety of notable phenomena which do not exist in the normal state, for instance quantum coherence, superconducting exchange coupling and spin-polarized triplet supercurrents [11,12]. This nascent field of superconducting spintronics promises to realize zero-energy-dissipation spin transfer and magnetization switching. Recent equilibrium (zero-bias) studies of the Josephson effect in S/FM/S (FM: ferromagnet; S: Superconductor) junctions and the critical temperature Tc modulation in FM/S/FM and S/FM/FM' superconducting spin valves have demonstrated that engineered magnetically-inhomogeneous S/FM interfaces can generate long-range triplet pairing states which explicitly carry spin [11,12]. However, direct measurement of triplet spin transport through a singlet S has not so far been achieved. In the second part, I will describe an essentially different approach, namely, a time-dependent ferromagnetic magnetization [ferromagnetic resonance (FMR)] can drive spin-polarized transport in a singlet S via spin-triplet states induced by spin-orbit coupling [13,14].

If time permits, I will briefly outline outstanding technical issues for the realization of energy-efficient (or even dissipation-less) spintronic technologies and present my research direction of how to address these issues via topology physics [15,16].

Reference: [1] Rev. Mod. Phys. 80, 1517 (2008), [2] Rev. Mod. Phys. 76, 323 (2004), [3] Nat. Mater. 11, 400 (2012), [4] Semicond. Sci. Technol. 27, 083001 (2012), [5] Nature 462, 491 (2009), [6] Appl. Phys. Express 4, 023003 (2011), [7] Phys. Rev. Appl. 2, 034005 (2014), [8] Nature 475, 82 (2011), [9] Nat. Mater. 13, 360 (2014), [10] Phys. Rev. B 91, 155305 (2015), [11] Nat. Phys. 11, 307 (2015), [12] Rep. Prog. Phys. 78, 104501 (2015), [13] Nat. Mater. 17, 499 (2018), [14] Phys. Rev. X 10, 031020 (2020), [15] Nat. Mater. 20, 1358 (2021), [16] Under review in Nat. Nanotech. (2022).


Contact: SunYoung Choi, (

Center for Quantum Coherence in Condensed Matter, KAIST

번호 일시 장소 연사 제목
377 March 18(Fri.) 11:00  Online seminar  Dr. Dirk Wulferding (IBS-Center for Correlated Electron Systems, Seoul National University, Seoul)  (응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids file
376 May 27,(Fri), 11:00 AM  Online seminar  Prof. Gray Rybka(University of Washington)  Current Status and Future Plans of ADMX file
375 May. 25th (Wed), 14:00  E6 Room(#2501)  Dr. Duk-Hyun Choe(Samsung Advanced Institute of Technology)  Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file
374 May. 25(Wed), 4pm  E6-2. 1st fl. #1323 / Zoom  Dr. Sungwoo Hong (Enrico Fermi Institute at University of Chicago)  Uncovering New Lampposts for Dark Matter: Continuum or Conformal
373 4pm, 26th May  E6 1323  황민수 (Department of Physics, Korea University)  (광학분야 특별세미나)Topological photonic devices
372 3pm, 19th May  online  Jonghee Yoon, PhD (Assistant professor, Department of Physics, Ajou University)  (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
371 5. 30(월), 16:00  E6, #1501  공수현교수 (고려대학교 물리학과)  Light manipulation using 2D layered semiconductors
370 5. 23(월),16:00  E6, #1501  김준성교수 (postech 물리학과)  Novel electronic transport in topological van der Waals magnets
369 5.16(월),16:00  E6, #1501  조규붕교수 (HKUST)  Design synthetic topological matter with atoms and lights
368 5. 9(월),16:00  E6, #1501  김창영교수 (서울대)  Searching for new electronic properties in correlated material flatland
367 5. 2(월),16:00  E6, #1501  유상운교수 (한밭대)  What can we learn from the history of science and technology?(우리말강의)
366 4. 25(월), 16:00  E6, #1501  정영욱 책임연구원 (한국원자력연구원)  Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의)
365 4. 11(월),16:00  E6, #1501  노재동교수 (서울시립대 물리학과)  Emergence of Statistical Mechanics in Quantum Systems
364 4. 4(월), 16:00  E6, #1501  김희철교수 (Postech 물리학과)  New paradigms in Quantum Field Theory
363 3. 28(월), 16:00  E6, #1501  이준희교수 (UNIST 에너지 및 화학공학부)  Ultimate-density atomic semiconductor via flat bands
362 3. 21(월),16:00  E6, #1501  이상성교수 (한국천문연구원)  Multi-wavelength Studies on Relativistic Jets from Gamma-ray Bright Active Galactic Nuclei
361 3. 14(월),16:00  E6, #1501  박용근교수 (KAIST 물리학과)  Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
360 3. 7(월),16:00`  E6, #1501  손석우교수 (서울대 지구환경과학부)  Climate Physics and Modelling(우리말강의)
359 2. 28(월),16:00  E6, #1501  김동규교수 (KAIST 물리학과)  Spin-based training of optical microscopes
358 May. 19(Thu), 4pm  E6-2. #1323 & Zoom  Dr.Jay Hyun Jo (Yale University, Department of Physics)  Chasing Long Standing Neutrino Anomalies with MicroBooNE