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VOLUME 77, NUMBER 6 P H Y S I C A L R E V I E W L E T T E R S 5 AUGUST 1996 Zeeman Splitting of the Coulomb Anomaly: A Tunneling Study in Two Dimensions
 

Summary: VOLUME 77, NUMBER 6 P H Y S I C A L R E V I E W L E T T E R S 5 AUGUST 1996
Zeeman Splitting of the Coulomb Anomaly: A Tunneling Study in Two Dimensions
Wenhao Wu,* J. Williams, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University,
Baton Rouge, Louisiana 70803
(Received 13 March 1996)
We report measurements of the tunneling density of states (DOS) of ultrathin Al films in
which superconductivity is quenched by a parallel magnetic field, Hk . 48 kG. The normal state
DOS not only displays the usual logarithmic zero bias anomaly (ZBA) but also a new anomaly,
superimposed on the ZBA, that appears at bias voltages V 2mBHk e, the electron Zeeman
splitting. Measurements in tilted fields reveal that the Zeeman feature collapses with increasing
perpendicular field component, suggesting that it is associated with the Cooper electron-electron
interaction channel. [S0031-9007(96)00791-0]
PACS numbers: 73.40.Gk, 71.30.+h, 72.15.Rn, 73.50.h
It is now well known that disorder has a profound in-
fluence on the transport characteristics of one and two di-
mensional (2D) electronic systems [1]. In particular, the
presence of disorder renormalizes the electron diffusivity
down from its Boltzmann value [1,2]. This attenuation of
the diffusivity with increasing disorder tends to reduce

  

Source: Adams, Philip W. - Department of Physics and Astronomy, Louisiana State University

 

Collections: Materials Science