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
487 2023-04-04 16:00  Room 2501, KAIST Natural Sciences Lecture Hall(E6)  Chiral Magnetism: A Geometric Perspective
486 2018-06-22 16:00  #1323, E6-2  Tuning functional properties of BiFeO3 films using strain and growth chemistry file
485 2018-06-22 16:00  #1323, E6-2  Tuning functional properties of BiFeO3 films using strain and growth chemistry file
484 2018-09-05 16:00  #1323, E6-2  Shining a light on fractional excitations file
483 2022-03-18 11:00  Online seminar  (응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids file
482 2021-03-02 16:00  Online  Sensitive terahertz detection with graphene-based transistors file
481 2020-11-20 16:00  Online  Coherent control of field gradient induced quantum dot spin qubits
480 2016-11-04 15:00  E6-2. #1323(1st fl.)  Quantum information experiments using few electron spins in semiconductors
479 2022-01-17 14:00  E6-2 Room 2502  Five Lectures on Observational Probes of Dark Energy file
478 2018-11-09 16:00  E6-2. 1st fl. #1323  Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
477 2022-11-18 16:00  E6-2. 1st fl. #1323 & Zoom  Qubits, new experimental tools for physics file
476 2020-11-20 14:30  Online  Lumpy Cooper pairs in an iron-based superconductor
475 2017-07-10 16:00  Jul. 10th (Mon), 4pm  “Intertwined Orders in a Heavy-fermion metal” file
474 2022-05-25 14:00  E6 Room(#2501)  Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file
473 2023-04-28 11:00  E6 #1323  Tkachenko wave: From the modern field theory viewpoint
472 2018-10-18 10:00  #1323, E6-2  Understanding membrane protein folding using single-molecule force techniques file
471 2023-07-19 16:00  E6-2, #1323  [High-Energy Theory Seminar]Deriving the Simplest Gauge-String Duality
470 2023-03-02 11:00  E6-2, #1322  Probing Anomalies of Non-Invertible Symmetries with Symmetry TFTs
469 2020-07-02 16:00  Zoom Video Conference Seminar  An irreversible qubit-photon coupling for the detection of itinerant microwave photons file
468 2015-08-04 11:00  B501, Room Red, KI bldg. 5nd fl.  Propagation of ultrasound through two- and three-dimensional strongly scattering media