Momentum Distribution Sum Rule for Angle-Resolved Photoemission ^*

Session Q11 - HTSC: PHOTOEMISSION
Mixed session, Friday morning, March 24, 8:00
Room B3, San Jose Convention Center

[Q11.08] Momentum Distribution Sum Rule for Angle-Resolved Photoemission ^*

MOHIT RANDERIA$^1$,HONG DING$^{1,2}$,J.-C. CAMPUZANO$^{1,2}$,A. BELLMAN$^{1,2}$,T. YOKOYA$^{3}$,T. TAKAHASHI$^{3}$,H. KATAYAMA-YOSHIDA$^{3}$,T. MOCHIKU$^{4}$,K. KADOWAKI$^{4}$,G. JENNINGS$^{1}$ ($^1$ Argonne National Laboratory)

Within a one-particle spectral function A(k,ømega) interpretation of angle-resolved photoemision (ARPES), the intensity obeys a simple sum rule: \int dømega f(ømega) A(k,ømega) = n(k) where f is the Fermi function and n(k) the momentum distribution. The usefulness of this sum-rule for analysing ARPES data on the high T_c cuprates will be demonstrated. First, even though the ARPES line shape is strongly T -dependent in Bi _2 Sr _2 CaCu _2 O _8 , the integrated intensity at k_F is independent of temperature, above and below the superconducting T_c ; away from k_F this is no longer the case. Second, the possibility of measuring the momentum distribution using ARPES is demonstrated for YBa _2 Cu _4 0 _8 .\hfil ^* Supported by the U.S. D.O.E., BES, Contract W-31-109-ENG-38

Part Q of program listing