• HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2020-10-15 16:00 
일시 October 15, 2020 (Thursday 
장소 CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus 
연사 Prof. Gil-Ho Lee (POSTECH) 

Seminar Invitation (October 15, 2020), 4 PM


Speaker: Prof. Gil-Ho Lee (POSTECH)


Date: October 15, 2020 (Thursday)


Time: 4:00 PM


Venue: CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus



Topic: Graphene-based Josephson junction microwave bolometer





Sensitive microwave detectors are critical instruments in radioastronomy, dark matter axion searches, and superconducting quantum information science. The conventional strategy towards higher-sensitivity bolometry is to nanofabricate an ever-smaller device to augment the thermal response. However, this direction is increasingly more difficult to obtain efficient photon coupling and maintain the material properties in a device with a large surface-to-volume ratio. Here we advance this concept to an ultimately thin bolometric sensor based on monolayer graphene. To utilize its minute electronic specific heat and thermal conductivity, we develop a superconductor-graphene-superconductor (SGS) Josephson junction bolometer embedded in a microwave resonator of resonance frequency 7.9 GHz with over 99% coupling efficiency. From the dependence of the Josephson switching current on the operating temperature, charge density, input power, and frequency, we demonstrate a noise equivalent power (NEP) of 7×10-19 W/Hz1/2, corresponding to an energy resolution of one single-photon at 32 GHz and reaching the fundamental limit imposed by the intrinsic thermal fluctuation at 0.19 K.


번호 날짜 장소 제목
344 2020-10-23 14:00  E6-2 #1323  Plasmon spectroscopy of low-dimensional superconductors in fluctuating regime file
343 2024-05-16 16:00  E6-2, #1323  [High Energy Theory Seminar] Conformal Collider Physics
342 2018-07-13 14:00  Room 5318, KAIST Natural Sciences Lecture Hall(E6).  Loop Induced Single Top Partner Production and Decay at the LHC
341 2018-12-11 16:00  E6-2. 1st fl. #1323  Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations file
340 2017-08-31 14:00  #5318(E6-2. 5th fl.)  “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file
339 2023-06-08 16:00  E6-2, #1323  Thermal decoupling in high-Tc cuprate superconductors
338 2019-05-31 11:00  #1323, E6-2  Cavity QED with Spin Qubits file
337 2022-05-27 11:00  Online seminar  Current Status and Future Plans of ADMX file
336 2015-07-23 13:30  E4, B401  Enhanced ZnO based UV photonics and related applications file
» 2020-10-15 16:00  CAPP Seminar Room #C303, Creation Hall (3F), KAIST Munji Campus  Graphene-based Josephson junction microwave bolometer file
334 2022-06-03 11:00  E6-2 #1323  (응집물리 세미나) Theoretical Investigation of Exotic Quantum States in Low-dimensional Materials
333 2023-03-27 15:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  A coherent mechanical oscillator pumped by a suspended quantum dot file
332 2022-09-21 16:00  College of Natural Science E6-2, Rm. 1323  Materials and Device Nanofabrication of Optical Metasurfaces file
331 2023-11-01 16:00  E6-2, #2502  [High Energy Theory Seminar] Modular functions and 3D N=4 rank-zero superconformal field theories
330 2019-02-21 16:00  #5313, E6-2  B-meson charged current anomalies - Theoretical status file
329 2023-03-30 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  Detecting axions with chiral magnetic effects file
328 2019-09-18 16:00  Seminar Room #1323  Fall 2019: Physics Seminar Serises file
327 2016-03-07 16:00  E6, 1501  Physics Colloquium : 2016 Spring file
326 2023-11-15 16:00  E6-6, #119  Quantum hydrodynamic theory for plasmonics: from molecule-coupling to nonlinear optics
325 2022-10-04 16:00  E6 #2501  Distinguishing 6d (1, 0) SCFTs