Rapid high-resolution spin- and angle-resolved photoemission spectroscopy with pulsed laser source and time-of-flight spectrometer

Review of Scientific Instruments - Tập 84 Số 9 - 2013
Kenneth Gotlieb1,2,3, Z. Hussain4,2,5, Aaron Bostwick4,2,5, Alessandra Lanzara4,2,6, Chris Jozwiak4,2,5
12Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
23Department of Physics, University of California, Berkeley, California 94720, USA and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
3University of California 1 Graduate Group in Applied Science and Technology, , Berkeley, California 94720, USA
41Graduate Group in Applied Science and Technology, University of California, Berkeley, California 94720, USA
5Lawrence Berkeley National Laboratory 2 Advanced Light Source, , Berkeley, California 94720, USA
6Lawrence Berkeley National Laboratory 3 Department of Physics, , Berkeley, California 94720, USA and Materials Sciences Division, , Berkeley, California 94720, USA

Tóm tắt

A high-efficiency spin- and angle-resolved photoemission spectroscopy (spin-ARPES) spectrometer is coupled with a laboratory-based laser for rapid high-resolution measurements. The spectrometer combines time-of-flight (TOF) energy measurements with low-energy exchange scattering spin polarimetry for high detection efficiencies. Samples are irradiated with fourth harmonic photons generated from a cavity-dumped Ti:sapphire laser that provides high photon flux in a narrow bandwidth, with a pulse timing structure ideally matched to the needs of the TOF spectrometer. The overall efficiency of the combined system results in near-EF spin-resolved ARPES measurements with an unprecedented combination of energy resolution and acquisition speed. This allows high-resolution spin measurements with a large number of data points spanning multiple dimensions of interest (energy, momentum, photon polarization, etc.) and thus enables experiments not otherwise possible. The system is demonstrated with spin-resolved energy and momentum mapping of the L-gap Au(111) surface states, a prototypical Rashba system. The successful integration of the spectrometer with the pulsed laser system demonstrates its potential for simultaneous spin- and time-resolved ARPES with pump-probe based measurements.

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Review of Scientific Instruments

Tập 84 Số 9

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