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Epitaxial growth and magnetic characterization of EuSe thin films with various crystalline orientations
Ying Wang, Xinyu Liu, Seul-Ki Bac +6
We report different growth modes and corresponding magnetic properties of thin EuSe films grown by molecular beam epitaxy on BaF2, Pb1-xEuxSe, GaAs, and Bi2Se3 substrates. We show…
Anomalous critical point behavior in dilute magnetic semiconductor (Ca,Na)(Zn,Mn)2Sb2
Shuang Yu, Xinyu Liu, Guoqiang Zhao +8
In this paper we report successful synthesis and magnetic properties of (Ca,Na)(Zn,Mn)2Sb2 as a new ferromagnetic dilute magnetic semiconductor (DMS). In this DMS material the conc…
MBE growth of 2H-MoTe2 and 1T'-MoTe2 on 3D substrates
Suresh Vishwanath, Aditya Sundar, Xinyu Liu +17
MoTe2 is the least explored material in the Molybdenum-chalcogen family, which crystallizes in thermodynamically stable semiconducting 2H phase at \textless 500 C and 1T' metallic…
Observation of oscillatory relaxation in the Sn-terminated surface of epitaxial rock-salt SnSe topological crystalline insulator
Wencan Jin, Suresh Vishwanath, Jianpeng Liu +20
Topological crystalline insulators have been recently predicted and observed in rock-salt structure SnSe thin films. Previous studies have suggested that the Se-terminate…
Four-wave mixing in perovskite photovoltaic materials reveals long dephasing times and weaker many-body interactions than GaAs
Samuel A. March, Drew B. Riley, Charlotte Clegg +6
Perovksite semiconductors have shown promise for low-cost solar cells, lasers and photodetectors, yet their fundamental photophysical properties are not well understood. Recent obs…
Molecular beam epitaxial growth of MoSe2 on graphite, CaF2 and graphene
Suresh Vishwanath, Xinyu Liu, Sergei Rouvimov +8
We report the structural and optical properties of molecular beam epitaxy (MBE) grown 2-dimensional (2D) material molybdenum diselenide (MoSe2) on graphite, CaF2 and epitaxial grap…
Ultrafast Probes of Nonequilibrium Hole Spin Relaxation in Ferromagnetic Semiconductor GaMnAs
Aaron Patz, Tianqi Li, Xinyu Liu +3
We directly measure the hole spin lifetime in ferromagnetic GaMnAs via time- and polarization-resolved spectroscopy. Below the Curie temperature Tc, an ultrafast photoexcitation wi…
Rapid diffusion of electrons in GaMnAs
C. P. Weber, Eric A. Kittlaus, Kassandra B. Mattia +5
We report ultrafast transient-grating measurements, above and below the Curie temperature, of the dilute ferromagnetic semiconductor (Ga,Mn)As containing 6% Mn. At 80 K (15 K), we…
Magnetic Anisotropy, Spin Pinning and Exchange Constants of (Ga,Mn)As films
Ying-Yuan Zhou, Yong-Jin Cho, Zhiguo Ge +3
We present a detailed investigation of exchange-dominated nonpropagating spin-wave modes in a series of 100 nm GaMnAs films with Mn concentrations ranging from…
Above-Room-Temperature Ferromagnetism in GaSb/Mn Digital Alloys
X. Chen, M. Na, M. Cheon +9
Digital alloys of GaSb/Mn have been fabricated by molecular beam epitaxy. Transmission electron micrographs showed good crystal quality with individual Mn-containing layers well re…