visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2024-09-26 14:00 
일시 Sep. 26th (THUR.), 2024 / 14:00 ~ 15:00 
장소 KAIST, Physics Bldg. (E6-2) / (Rm. 3441) 
연사 Hoon Kim [Caltech, USA] 

Date & Time: Sep. 26th (THUR.), 2024 / 14:00 ~ 15:00

PlaceKAIST, Physics Bldg. (E6-2) / (Rm. 3441)

Title : Quantum spin nematic phase in a square-lattice iridate

- Lecturer : Hoon Kim [Caltech, USA

Abstract: 

Spin nematic (SN) is a magnetic analogue of classical liquid crystals, a fourth state of matter exhibiting characteristics of both liquid and solid [1,2]. This elusive phase of matter is often manifested by a spontaneous symmetry breaking with spin-quadrupole order; however, its experimental observation has been limited to indirect approaches [3,4], given that the spin-quadrupole moments preserve the time-reversal symmetry and thus are insensitive to most experimental probes.

In this talk, we propose a SN phase in the square-lattice iridate Sr2IrO4, which approximately realizes a pseudospin one-half Heisenberg antiferromagnet (AF) in the strong spin-orbit coupling limit. Much research on this compound has focused on its analogy with high-Tc cuprates [5]. Here, a new possibility is explored by three experimental probes, which, when taken together, suggest the formation of a SN phase at around 263 K: (i) polarization-resolved resonant inelastic x-ray scattering, (ii) circular-dichroic resonant x-ray diffraction, and (iii) Raman spectroscopy. Our results reveal a quantum order underlying the Néel AF that is widely believed to be intimately connected to the mechanism of high-Tc superconductivity [6].

 

 

[1] M. Blume and Y. Y. Hsieh, J. Appl. Phys. 40, 1249 (1969)

[2] A. F. Andreev and I. A. Grishchuk, Sov. Phys. JETP 60, 267 (1984)

[3] Y. Kohama et al., Proc. Natl. Acad. Sci. USA 116, 10686 (2019)

[4] M. Mourigal et al., PRL 109, 027203 (2012).

[5] J. Bertinshaw, Y. K. Kim, G. Khaliullin, and B. J. Kim, Annu. Rev. Condens. Matter Phys. 10, 315 (2019)

[6] H. Kim et al., Nature 625, 264 (2024)

 

 

 - Contact: Prof.  Myung-Joon Han , School of Physics, KAIST(mj.han@kaist.ac.kr  )

번호 날짜 장소 제목
560 2018-07-12 17:00  Room 5318, KAIST Natural Sciences Lecture Hall(E6)  The MilliQan Experiment: Search for Milli-Charged Particles at the LHC
559 2017-12-14 15:00  Seminar Room (C303), Creation Hall (3F), KAIST Munji Campus  Exploring the Universe via GWs in the era of multi-messenger astronomy
558 2018-09-05 16:00  #1323, E6-2  Shining a light on fractional excitations file
557 2019-09-26 16:00  #1323, E6-2  Entanglement Swapping with Autonomous Polarization-Entangled Photon-Pairs from Warm Atomic Ensemble file
556 2018-09-20 16:00  #1323, E6-2  Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
555 2018-09-20 16:00  #1323, E6-2  Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
554 2019-09-18 16:00  #1323, E6-2  Exploring Synthetic Quantum Matter in Superconducting Circuits file
553 2019-09-10 15:00  #2502, E6-2  (2+1) D Duality Web from 3D Euclidean Lattice file
552 2020-09-28 17:30  Zoom webinar  KAIST Global Forum for Spin and Beyond(Fourth Forum) file
551 2022-09-22 11:00  E6-1 #1323  2022 가을학기 응집물리 및 광학 세미나 전체 일정 file
550 2023-09-13 16:00  E6-2, #2502  [High Energy Theory Seminar] Cosmic Birefringence from Dark Photon
549 2018-09-04 14:30  E6-2. 2st fl. #2502  Ultrafast time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme ultraviolet laser pulses file
548 2022-09-30 16:00  E6-2. 1st fl. #1323 & Zoom  Spin-orbit torque-based spintronic devices file
547 2022-09-30 14:30  E6-2. 1st fl. #1323 & Zoom  Putting a spin on the Josephson effect file
546 2016-09-29 16:00  E6-2 #1323 (1st floor)  Large-scale Silicon Photonic MEMS Switches
545 2022-09-29 16:00  E6-2 #1323  (광학분야 세미나) Ultrafast THz Field-Induced Nonlinear Optics
544 2016-09-29 16:00  E6-2. #2501(2nd fl.)  Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?
543 2019-09-27 16:00  E6-2. 1st fl. #1323  0D/1D/2D/3D III-V materials grown by MBE for Optelectronics file
542 2019-09-27 14:30  E6-2. 1st fl. #1323  Spin-charge conversion in topological insulators for spintronic applications file
» 2024-09-26 14:00  KAIST, Physics Bldg. (E6-2) / (Rm. 3441)  Quantum spin nematic phase in a square-lattice iridate