Effect of modified periodic waveforms on current-induced spin polarization measurements

Joseph R Iafrate,Davide Del Gaudio,Simon Huang,Rachel S Goldman,Vanessa Sih

doi:10.1063/1.5026760

Joseph R Iafrate, Davide Del Gaudio + Show 3 more

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Journal: AIP Advances	Publication Date: Jun 1, 2018
License type: cc-by

Affiliation: University of Michigan–Ann Arbor

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Applying a voltage to a semiconductor sample generates a current-induced electron spin polarization (CISP). Using an ultrafast mode-locked laser and lock-in detection scheme, we measure CISP on an indium gallium arsenide epilayer via Faraday rotation and extract the spin generation rate. While the measured spin polarization initially increases linearly with electric field as observed in previous work, larger applied voltages lead to a decreasing spin generation rate. We show that we can recover the linear dependence of spin generation rate with electric field even at larger applied voltages by modifying the applied voltage waveform to reduce heating and multiplying by an appropriate correction factor. Future CISP studies can utilize this technique to investigate CISP under larger applied electric fields.

Highlights

Much effort has been dedicated to the study of spin-orbit interactions in semiconductors.[1,2] there is interest in understanding the electrical generation, manipulation, and detection of spin-polarized carriers, towards the goal of an all-electrical spin-based device.[3,4] One way forward is to make use of current-induced spin polarization (CISP), a phenomenon in which an electrical current generates a bulk, homogeneous, steady-state electron spin polarization.[5]
CISP has been observed in various materials,[6,7,8,9,10,11,12,13,14] with both electrical generation and manipulation achieved in an n-InGaAs heterostructure,[15] and recent theoretical work has produced a model that qualitatively agrees with the measured dependence of CISP on sample parameters.[14,16]
A majority of previous work has observed that CISP increases linearly with applied electric field.[5,8,9,11,12]

Summary

Introduction

Much effort has been dedicated to the study of spin-orbit interactions in semiconductors.[1,2] there is interest in understanding the electrical generation, manipulation, and detection of spin-polarized carriers, towards the goal of an all-electrical spin-based device.[3,4] One way forward is to make use of current-induced spin polarization (CISP), a phenomenon in which an electrical current generates a bulk, homogeneous, steady-state electron spin polarization.[5]. Published Online: 18 June 2018 Joseph R. (Received 23 February 2018; accepted 7 June 2018; published online 18 June 2018)

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