@article{ISI:000226736200133,
 abstract = {Time-dependent scanning tunneling microscopy has been used to evaluate
step fluctuations as a function of temperature (300-450 K) on Ag(111)
films grown on mica. The temporal correlation function scales as a power
law in time t(1/n) with measured values of 1/n varying over a range of
0.19+/-0.04 to 0.29+/-0.04 with no correlation on temperature. The
average value of 1/n=0.24+/-0.01 is consistent with step-edge diffusion
limited fluctuations (n=z=4, conserved noise). The magnitude of the time
correlation function and the width of the fluctuations both scale with
temperature with the same apparent activation energy of
E-eff=0.21+/-0.02 eV, indicating that the correlation time is at most
weakly temperature dependent. Direct analysis of the autocorrelation
function confirms that the correlation time is at most weakly
temperature dependent, and thus the apparent correlation length is
strongly temperature dependent. This behavior can be reproduced by
assuming that the apparent correlation length is governed by the longest
wavelength of step fluctuations that can be sampled in the measurement
time interval. Evaluation of the correlation time for previous
measurements for Al/Si(111) (z=2) yields the same conclusion about
measurement time interval. In both cases the ratio of the measurement
time to the effective correlation time is on the order of 10.},
 article-number = {045426},
 author = {Bondarchuk, O and Dougherty, DB and Degawa, M and Williams, ED and
Constantin, M and Dasgupta, C and Das Sarma, S},
 doi = {10.1103/PhysRevB.71.045426},
 issn = {1098-0121},
 journal = {PHYSICAL REVIEW B},
 month = {JAN},
 number = {4},
 orcid-numbers = {Sarma, Sankar Das/0000-0002-0439-986X
Dasgupta, Chandan/0000-0002-0302-1881
Bondarchuk, Oleksandr/0000-0001-7380-8930},
 researcherid-numbers = {Dougherty, Daniel/AAA-9562-2019
Sarma, Sankar Das/B-2400-2009
},
 times-cited = {24},
 title = {Correlation time for step structural fluctuations},
 unique-id = {ISI:000226736200133},
 volume = {71},
 year = {2005}
}