visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Search for dark matter axion with Rydberg atoms

2021.03.19 17:37

admin 조회 수:2296

날짜 2021-03-25 16:00 
일시 Mar25(Thur), 04:00PM 
장소 Online Seminar (Zoom) 
연사 Prof. Atsushi Tokiyasu (Tohoku Univ.) 

Topic: Search for dark matter axion with Rydberg atoms

 

Speaker: Prof. Atsushi Tokiyasu


Date: March 25, 2021 (Thursday)
Time: 4:00 PM

 

Venue: Online Seminar (Zoom Teleconference System)
 
https://kaist.zoom.us/j/6108068959?pwd=TXV2OGlWdVRtcGhmNXVTRWlla2pHQT09

Meeting ID: 610 806 8959

Passcode: 131015
     

Abstract:     

 

Axion is a hypothetical particle, originally proposed to solve the Strong CP problem in the QCD theory. Axion is believed to be generated in the early universe, and it is known to be one of the candidates of cosmic dark matter.

Many search experiments were performed, but the existence of axion has not been established yet.

From the recent observation on the cosmic microwave and the theoretical calculation, it is suggested that the
axion has a mass of O(100) micro-eV. We are aiming to search for axion in this mass region (New-CARRACK
project).
In the New-CARRACK project, we are planning to search for axion by using a single photon detection method.
Single photon detection is free from the standard quantum limit, and allows us to search for axion with a wide
range of mass without degrading its detection sensitivity.
If the mass of axion is O(100) micro-eV, the converted photon with strong magnetic field have the frequency of O
(10) GHz. It is difficult to detect this photon with a micro-wave cavity, and we will use a Rydberg atom, which is an excited atom that have electrons with high principal quantum number (n~100).
Rydberg atom is known to be sensitive to micro-wave photons. By changing the excited level with the laser
system, we can control the sensitive frequency. In addition, we can search for axion in the wide mass range by
using direct photo-ionization processes.
 
We are now constructing a detector system which consists of superconducting magnet, a dilution refrigerator and high-precision laser system to excite a Rydberg atom.We have also found a new method to improve S/N of axion search which utilize
a cooled and bunched beam of Rydberg atoms.
 

 

In this seminar, the recent results of axion search experiments are reviewed. The overview of New-CARRACK project are
introduced, and the preparation status will be reported.
Poster_Tokiyasu (Revised).jpg

 

introduced, and the preparation status will be reported.

 

번호 날짜 장소 제목
351 2018-10-04 16:00  #1323, E6-2  Engineering light absorption in an ultrathin semiconductor metafilm file
350 2018-10-11 16:00  #1323, E6-2  Dirac electrons in a graphene quasicrystal file
349 2018-10-12 14:30  E6-2. 1st fl. #1323  Quantum Advantage in Learning Parity with Noise file
348 2018-10-12 16:00  E6-2. 1st fl. #1323  Direct observation of a two-dimensional hole gas at oxide interfaces file
347 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file
346 2018-10-16 10:00  #1323, E6-2  Capturing protein cluster dynamics and gene expression output in live cells file
345 2018-10-18 10:00  #1323, E6-2  Understanding membrane protein folding using single-molecule force techniques file
344 2018-10-18 16:00  #1323, E6-2  Applications of nonlinear optics for condensed matter researches file
343 2018-10-19 10:00  #1323, E6-2  Energy conversion processes during magnetic reconnection in a laboratory plasma file
342 2018-10-24 10:30  E6-1, Lecture Room 1501(1F)  Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers file
341 2018-10-25 16:00  #1323, E6-2  Abelian and non-Abelian dark photons file
340 2018-10-26 16:00  #1323, E6-2  Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
339 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
338 2018-11-08 16:00  #1323, E6-2  Conformality lost file
337 2018-11-09 14:30  E6-2. 1st fl. #1323  Moiré superlattices – from twisted bilayer graphene to quasicrystal file
336 2018-11-09 16:00  E6-2. 1st fl. #1323  Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
335 2018-11-21 15:00  #1323, E6-2  Engineering topological quantum physics at the atomic scale file
334 2018-11-22 15:00  E6 Room(#1323)  Experimental and Computational Study on Physical Properties based on Granular System file
333 2018-11-23 15:00  E6-2. 2st fl. #2501  Entanglement string and Spin Liquid with Holographic duality file
332 2018-11-29 16:00  #1323, E6-2  양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file