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Title: Higgs Mode in the d -Wave Superconductor Bi 2 Sr 2 CaCu 2 O 8 + x Driven by an Intense Terahertz Pulse

We investigated the terahertz (THz)-pulse driven nonlinear response in the d-wave cuprate superconductor Bi 2Sr 2CaCu 2O 8+x (Bi2212) using a THz pump near-infrared probe scheme in the time domain. We have observed an oscillatory behavior of the optical reflectivity that follows the THz electric field squared and is strongly enhanced below Tc. The corresponding third-order nonlinear effect exhibits both A 1g and B 1g symmetry components, which are decomposed from polarization-resolved measurements. Comparison with a BCS calculation of the nonlinear susceptibility indicates that the A 1g component is associated with the Higgs mode of the d-wave order parameter.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [4] ; ORCiD logo [4] ;  [5] ;  [6] ;  [1]
  1. The Univ. of Tokyo, Tokyo (Japan)
  2. RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
  3. The Univ. of Tokyo, Tokyo (Japan); JST, PRESTO, Kawaguchi (Japan)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. The Univ. of Tokyo, Tokyo (Japan); ETH Zurich, Zurich (Switzerland); National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  6. The Univ. of Tokyo, Tokyo (Japan); Univ. Paris Diderot, Paris Cedex (France)
Publication Date:
Report Number(s):
BNL-203580-2018-JAAM
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
SC0012704; de-sc0012704
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 11; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1435733
Alternate Identifier(s):
OSTI ID: 1426018