• HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2021-06-11 14:30 
일시 Jun. 11 (Fri.), 02:30 PM 
장소 Online seminar 
연사 Dr. Jin Woong Cha(KRISS) 


SRC Seminar



Engineering sound waves and vibrations in multi-mode nanomechanical systems


Dr. Jin Woong Cha

Quantum Technology Institute, KRISS


Jun. 11 (Fri.), 02:30 PM

Online seminar
회의 ID: 892 8325 2628

암호: 916514






Nanoscale mechanical systems provide versatile physical interfaces with their ability to interact with various physical states, for example, electromagnetic fields (e.g., microwaves and optical light) and quantum states (e.g., spins and electrons). Therefore, engineering nanoscale sound waves and vibrations in nanomechanical systems is essential for a wide range of applications in sensing and information processing both in the classical and quantum regimes. My talk will focus on two different nanomechanical platforms I have recently worked on. In the first part of my talk, I will discuss a unique nanomechanical platform called nanomechanical lattices which enable electrically tunable phonon propagation dynamics [1] and topologically protected phonon transport [2] at MHz frequencies. This platform consists of arrays of mechanically coupled, free-standing silicon-nitride nanomechanical membranes that support propagating flexural elastic waves. For the second part of my talk, I will describe our recent studies on the cavity electromechanics in a superconducting nanoelectromechanical resonator implementing superconducting niobium [3]. This system demonstrates various optomechanical phenomena arising from the interaction of nanomechanical motions and microwave fields (e.g., phonon cooling and amplification, optomechanically induced reflection) and can be used in various applications such as quantum transducers. I will then conclude my talk by briefly describing our ongoing work at KRISS.



[1] J. Cha, et al. Nature Nanotechnology 13, 1016-1020 (2018)

[2] J. Cha, et al. Nature 564, 229-233 (2018)

[3] J. Cha, et al. Nano Letters 21, 1800-1806 (2021)



Contact: SunYoung Choi, (

Center for Quantum Coherence in Condensed Matter, KAIST


번호 날짜 장소 제목
127 2020-10-15 16:00  CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus  Graphene-based Josephson junction microwave bolometer file
126 2016-06-01 10:30  BK21 Conference Room (#1318, E6-2)  Welcome to Nature Photonics
125 2015-08-04 11:00  B501, Room Red, KI bldg. 5nd fl.  Propagation of ultrasound through two- and three-dimensional strongly scattering media
124 2019-07-10 16:00  Academic Cltural Complex (E9) 5층 스카이라운지  Public Lectures file
123 2016-10-18 13:30  1st fl. #1323(E6-2)  "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
122 2016-12-12 13:30  1:30p.m. #1323(E6-2. 1st fl.)  “Possible symmetry in the phase diagrams of electron- & hole-doped cuprate high-Tc superconductors”
121 2015-03-04 12:00  1323호, E6-2  Bioimaging and Biosensing Using Near-Infrared Fluorescence file
120 2020-10-15 16:00  (  Towards resource-efficient and fault-tolerant quantum computation with nonclassical light
119 2018-02-12 15:00  #C303, (Creation Hall 3F, KAIST Munji Campus)  The recent result of XMASS Experiment
118 2019-12-27 15:00  #5318, E6-2  The superconducting order parameter puzzle of Sr2RuO4 file
117 2019-05-21 16:00  #5318, E6-2  Classification of flat bands according to the band-crossing singularity of Bloch wave functions file
116 2017-08-31 14:00  #5318(E6-2. 5th fl.)  “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file
115 2016-11-18 10:30  #5318(5th fl.)  Non-equilibrium many-body spin dynamics in diamond
114 2017-11-08 13:00  #5318 (E6-2. 5th fl.)  “Emergent exotic quasiparticles in quantum spin liquids” file
113 2019-02-21 16:00  #5313, E6-2  B-meson charged current anomalies - Theoretical status file
112 2019-11-20 16:00  #5302, E6-2  Correlation between superconducting transition temperature and critical current density in irradiated iron-based superconductors file
111 2019-06-27 14:00  #2502, E6-2  Gapless Kitaev Spin Liquid to Loop and String Gases file
110 2019-09-10 15:00  #2502, E6-2  (2+1) D Duality Web from 3D Euclidean Lattice file
109 2018-04-06 10:00  #2502, E6  Entanglement and thermalization in many-body systems: recent progress file
108 2019-12-13 13:00  #2501, E6-2  Computational Material Designs: Current Status and Future Directions file