819 citations · 6.1k across the 88 of their papers we have counts for
24 papers · 1 filter
Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
Hanan Dery, Cedric Robert, Scott A. Crooker +2
Tuning the density of resident electrons or holes in semiconductors provides crucial insight into the composition of excitonic complexes that are observed as absorption or photolum…
Topological Surface Magnetism and Neel Vector Control in a Magnetoelectric Antiferromagnet
Kai Du, Xianghan Xu, Choongjae Won +5
Antiferromagnetic states with no stray magnetic fields can enable high-density ultra-fast spintronic technologies. However, the detection and control of antiferromagnetic Neel vect…
Nonreciprocal directional dichroism at telecom wavelengths
K. Park, M. O. Yokosuk, M. Goryca +7
Magnetoelectrics with ultra-low symmetry and spin-orbit coupling are well known to display a number of remarkable properties including nonreciprocal directional dichroism. As a pol…
Hexcitons and oxcitons in monolayer WSe
Dinh Van Tuan, Su-Fei Shi, Xiaodong Xu +2
In the archetypal monolayer semiconductor WSe, the distinct ordering of spin-polarized valleys (low-energy pockets) in the conduction band allows for studies of not only simple…
Valley relaxation of resident electrons and holes in a monolayer semiconductor: Dependence on carrier density and the role of substrate-induced disorder
Jing Li, M. Goryca, K. Yumigeta +3
Using time-resolved optical Kerr rotation, we measure the low temperature valley dynamics of resident electrons and holes in exfoliated WSe monolayers as a systematic function…
Room Temperature Magnetic Order in Air-Stable Ultra-Thin Iron Oxide
Jiangtan Yuan, Andrew Balk, Hua Guo +6
Certain two-dimensional (2D) materials exhibit intriguing properties such as valley polarization, ferroelectricity, superconductivity and charge-density waves. Many of these materi…
Broadband spectroscopy of thermodynamic magnetization fluctuations through a ferromagnetic spin-reorientation transition
A. L. Balk, F. Li, I. Gilbert +3
We use scanning optical magnetometry to study the broadband frequency spectra of spontaneous magnetization fluctuations, or "magnetization noise", in an archetypal ferromagnetic fi…
Unusual thickness dependence of exciton characteristics in 2D perovskite quantum wells
J. -C. Blancon, A. V. Stier, H. Tsai +12
Understanding the nature and energy distribution of optical resonances is of central importance in low-dimensional materials and its knowledge is critical for designing eff…
Spin coherence and dephasing of localized electrons in monolayer MoS
Luyi Yang, Weibing Chen, Kathleen M. McCreary +3
We report a systematic study of coherent spin precession and spin dephasing in electron-doped monolayer MoS. Using time-resolved Kerr rotation spectroscopy and applied in-plane…
Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS_2 and WS_2
Luyi Yang, Nikolai A. Sinitsyn, Weibing Chen +4
The recently-discovered monolayer transition metal dichalcogenides (TMDCs) provide a fertile playground to explore new coupled spin-valley physics. Although robust spin and valley…
Magneto-electroluminescence of organic heterostructures: Analytical theory and spectrally resolved measurements
Feilong Liu, Megan R. Kelley, Scott A. Crooker +4
The effect of a magnetic field on the electroluminescence of organic light emitting devices originates from the hyperfine interaction between the electron/hole polarons and the hyd…
Spectrally-resolved hyperfine interactions between polaron and nuclear spins in organic light emitting diodes: Magneto-EL studies
S. A. Crooker, F. Liu, M. R. Kelley +7
We use spectrally-resolved magneto-electroluminescence (EL) measurements to study the energy dependence of hyperfine interactions between polaron and nuclear spins in organic LEDs.…
Revealing Optically Induced Magnetization in SrTiO using Optically Coupled SQUID Magnetometry and Magnetic Circular Dichroism
W. D. Rice, P. Ambwani, J. D. Thompson +2
In this work, we study the time- and temperature-dependence of optically induced magnetization in bulk crystals of slightly oxygen-deficient SrTiO using an optically couple…
Tunable magnetic exchange interactions in manganese-doped inverted core/shell ZnSe/CdSe nanocrystals
David A. Bussian, Scott A. Crooker, Ming Yin +3
Magnetic doping of semiconductor nanostructures is actively pursued for applications in magnetic memory and spin-based electronics. Central to these efforts is a drive to control t…
Bias-controlled sensitivity of ferromagnet/semiconductor electrical spin detectors
S. A. Crooker, E. Garlid, A. N. Chantis +6
Using Fe/GaAs Schottky tunnel barriers as electrical spin detectors, we show that the magnitude and sign of their spin-detection sensitivities can be widely tuned with the voltage…
Electrical Detection of Spin Transport in Lateral Ferromagnet-Semiconductor Devices
X. Lou, C. Adelmann, S. A. Crooker +6
A longstanding goal of research in semiconductor spintronics is the ability to inject, modulate, and detect electron spin in a single device. A simple prototype consists of a later…
Tuning alloy disorder in diluted magnetic semiconductors in high fields to 89 T
S. A. Crooker, N. Samarth
Alloy disorder in II-VI diluted magnetic semiconductors (DMS) is typically reduced when the local magnetic spins align in an applied magnetic field. An important and untested expec…
Optical and electrical spin injection and spin transport in hybrid Fe/GaAs devices
S. A. Crooker, M. Furis, X. Lou +4
We discuss methods for imaging the nonequilibrium spin polarization of electrons in Fe/GaAs spin transport devices. Both optically- and electrically-injected spin distributions are…
Low temperature terahertz spectroscopy of n-InSb through a magnetic field driven metal-insulator transition
X. P. A. Gao, J. Y. Sohn, S. A. Crooker
We use fiber-coupled photoconductive emitters and detectors to perform terahertz (THz) spectroscopy of lightly-doped n-InSb directly in the cryogenic (1.5 K) bore of a high-field s…
Electrical Detection of Spin Accumulation at a Ferromagnet-Semiconductor Interface
X. Lou, C. Adelmann, M. Furis +3
We show that the accumulation of spin-polarized electrons at a forward-biased Schottky tunnel barrier between Fe and n-GaAs can be detected electrically. The spin accumulation lead…
Time- and Polarization-Resolved Optical Spectroscopy of Colloidal CdSe Nanocrystal Quantum Dots in High Magnetic Fields
Madalina Furis, Jennifer Hollingsworth, Victor I. Klimov +1
In an effort to elucidate the spin (rather than charge) degrees of freedom in colloidal semiconductor nanocrystal quantum dots, we report on a series of static and time-resolved ph…
Effects of strain, electric, and magnetic fields on lateral electron spin transport in semiconductor epilayers
M. Hruska, S. Kos, S. A. Crooker +2
We construct a spin-drift-diffusion model to describe spin-polarized electron transport in zincblende semiconductors in the presence of magnetic fields, electric fields, and off-di…
Bright-Exciton Fine Structure and Anisotropic Exchange in CdSe Nanocrystal Quantum Dots
M. Furis, H. Htoon, M. A. Petruska +3
We report on polarization-resolved resonant photoluminescence (PL) spectroscopy of bright (spin-1) and dark (spin-2) excitons in colloidal CdSe nanocrystal quantum dots. Using high…
Imaging spin flows in semiconductors subject to electric, magnetic, and strain fields
S. A. Crooker, D. L. Smith
Using scanning Kerr microscopy, we directly acquire two-dimensional images of spin-polarized electrons flowing laterally in bulk epilayers of n:GaAs. Optical injection provides a l…