Author Interview: Christopher Smallwood
An ultrafast angle-resolved photoemission apparatus for measuring complex materials
Christopher L. Smallwood, Christopher Jozwiak, Wentao Zhang (张文涛), and Alessandra Lanzara
We present technical specifications for a high resolution time- and angle-resolved photoemission spectroscopy setup based on a hemispherical electron analyzer and cavity-dumped solid state Ti:sapphire laser used to generate pump and probe beams, respectively, at 1.48 and 5.93 eV. The pulse repetition rate can be tuned from 209 Hz to 54.3 MHz. Under typical operating settings the system has an overall energy resolution of 23 meV, an overall momentum resolution of 0.003 Ǻ−1, and an overall time resolution of 310 fs. We illustrate the system capabilities with representative data on the cuprate superconductor Bi2Sr2CaCu2O8+δ. The descriptions and analyses presented here will inform new developments in ultrafast electron spectroscopy.
ABOUT THE AUTHORS
Chris Smallwood is a graduate student in physics at UC Berkeley and in the Materials Sciences Division,
Lawrence Berkeley National Laboratory. He earned an AB in physics from Harvard University in 2005.
Chris Jozwiak is a staff scientist at the Advanced Light Source, Lawrence Berkeley National Laboratory.
He worked as a postdoctoral fellow from 2009-2012 at the Advanced Light Source, earned a PhD in physics
at UC Berkeley in 2008, and received a BS in physics from Duke University in 2001.
Wentao Zhang is a postdoctoral fellow in the Materials Sciences Division, Lawrence Berkeley National Laboratory.
He earned a PhD in condensed matter physics in 2010 at the Chinese Academy of Sciences in Beijing.
Alessandra Lanzara is a full professor of physics at UC Berkeley and a faculty scientist in the Materials Sciences Division,
Lawrence Berkeley National Laboratory since 2002. She worked as a postdoctoral fellow from 1999-2002 at
Stanford University, and earned a PhD in physics in 1999 from Universita' La Sapienza in Rome, Italy.
Read More from the Authors in AIP Journals
A high-efficiency spin-resolved photoemission spectrometer combining time-of-flight spectroscopy with exchange-scattering polarimetry
C. Jozwiak, J. Graf, G. Lebedev, N. Andresen, A. K. Schmid, A. V. Fedorov, F. El Gabaly, W. Wan, A. Lanzara, and Z. Hussain
Rev. Sci. Instrum. 81, 053904 (2012).
Vacuum space charge effect in laser-based solid-state photoemission spectroscopy
J. Graf, S. Hellmann, C. Jozwiak, C. L. Smallwood, Z. Hussain, R. A. Kaindl, L. Kipp, K. Rossnagel, and A. Lanzara
J. Appl. Phys. 107, 014912 (2010).