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
568 2024-11-21 16:00  자연동(E6) 1323호  Time-resolved photoemission: From bandstructure to orbital movies / Nanophotonics 초세대 협업 연구실 file
567 2024-11-13 12:00  Online  [11/13(수) 물리학과 세미나 안내] Separability as a window to mixed-state quantum phases and phase transitions / Tarun Grover (UC San Diego, Associate Professor)
566 2024-10-31 13:00  E6-2 / Rm. 3441  Mini-workshop on first-principles DFT methods and applications
565 2024-10-30 14:30  E6-2, #3441  [Seminar Invitation] Mario Cuoco (CNR-SPIN, c/o University of Salerno, Fisciano, Italy) / 2024.10.30. 14:30 / E6-2, #3441
564 2024-10-21 13:00  E6-2 #3441  [Physics Seminar] “Non-Hermitian Point-Gap Topology in Junction Systems” file
563 2024-10-17 16:00  온라인 (https://kaist.zoom.us/j/89289652931?pwd=eNz6xnTFrEMGXYj9fXpdBJsW9fEpJX.1)  Photonic Methods for Quantum Levitodynamics Beyond the Rayleigh Regime
562 2024-10-14 11:00  KI Building(E4), Matrix Hall(2nd Floor)  [RSVP, Oct 14th Mon] Ambassador of Hungary to Republic of Korea Special Lecture file
561 2024-10-02 12:00  E6-2, #3441  Data-driven discovery of neural computations through brain-wide and cell-type-specific dynamical systems file
» 2024-09-26 14:00  KAIST, Physics Bldg. (E6-2) / (Rm. 3441)  Quantum spin nematic phase in a square-lattice iridate
559 2024-09-03 12:00  자연과학동(E6-2) 1323  2024 가을학기 물리학과 특별세미나 전체 일정 (응집물리 및 광학분야) file
558 2024-09-02 16:00  자연과학동 1501호(공동강의실)  2024학년도 가을학기 물리학과 콜로키움(Physics Colloquium) file
557 2024-08-22 16:00  RM #C303, Creation Hall (3F), KAIST Munji Campus  [CAPP seminar] Development of a 12-20 GHz CO Intensity Mapping Receiver for Capturing the Star-formation History in the Early Universe file
556 2024-08-16 11:00  E6 1322 (no zoom broadcasting)  Cathodoluminescence for nanophotonics: Applications to plasmonic bandgap materials and perovskite semiconductors file
555 2024-08-14 11:00  E6, #3441  Pair Density Waves and Supercurrent Diode Effect in Altermagnets
554 2024-07-25 16:00  Rm. 3441, E6-2 (Advanced Physics Lecture Hall)  Generation and Certification of Optical Quantum States for Information Processing file
553 2024-07-23 16:00  KI Building(E4) Matrix Hall(2F)  Spin Conversion Research Towards Novel Spintronic Functionalities file
552 2024-07-22 14:00  E6-2 #3441  Nonthermal electronic orders in photo-doped Mott insulators
551 2024-07-18 11:00  E6-2 #1323  Acousto-electric non-local detection of magnon-phonon coupling
550 2024-07-10 16:00  E6-2 #2502  [High Energy Theory Seminar] The Weak Gravity Conjecture in Perturbative String Theory
549 2024-07-03 16:00  E6-2 #2502  [High Energy Theory Seminar] Holographic duals of Higgsed Dpb(BCD)