APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010;
Portland, Oregon
Session X35: Focus Session: Spins in Semiconductors -- Spin Dynamics
2:30 PM–5:30 PM,
Thursday, March 18, 2010
Room: E145
Sponsoring
Units:
GMAG DMP FIAP
Chair: Roland Kawakami, University of California, Riverside
Abstract ID: BAPS.2010.MAR.X35.4
Abstract: X35.00004 : Spin noise spectroscopy from acoustic to GHz frequencies
3:06 PM–3:42 PM
Preview Abstract
Abstract
Author:
Jens H\"ubner
(Institute for Solid State Physics, Leibniz University of Hannover, Appelstr. 2, 30167 Hannover, Germany)
Performing perturbation free measurements on semiconductor
quantum systems has long been banished to
textbooks on quantum mechanics. The emergent technique of spin
noise spectroscopy is challenging this restriction. Empowered
only by the ever present intrinsic spin fluctuation dynamics in
thermal
equilibrium, spin noise spectroscopy is capable to directly
deduce several physical properties of
carriers spins in semiconductors from these fluctuations.
Originating from spin noise measurements on
alkali metal vapors in quantum optics [1] the method has become a
powerful technique to unravel the
intrinsic spin dynamics in semiconductors [2]. In this talk I
will present the recent progress of spin noise spectroscopy and
how it is used to monitor the spin dynamic in semiconductor
quantum wells at thermal equilibrium and as a consequence thereof
directly detect the spatial dynamics of the carriers being marked
with their own spin on a microscopic scale [3]. Further I will
present measurements of how the non-perturbative nature of spin
noise spectroscopy gives valuable insight into the delicate
dependence of the spin relaxation time of electrons on doping
density and temperature in semiconductors n-doped in the vicinity
of the metal-insulator transition where hyperfine and intra-band
depolarization compete [4]. Also the measurement bandwidth can be
extended to GHz frequencies by ultrafast optical probing [5]
yielding in conjunction with depth resolved spin noise
measurements insights into the origin of inhomogeneous spin
dephasing effects at high magnetic fields [5]. Additionally I
will present how spin noise spectroscopy can be employed to
spatially depth resolve doping profiles with optical resolution
[6] and give a summary on easy to implement techniques of spin
noise spectroscopy at acoustic frequencies in alkali metal
vapors. \\[4pt]
\noindent [1] E.~Aleksandrov and V.~Zapassky, Zh. Eksp. Teor.
Fiz. \textbf{81}, 132 (1981); S.~A.
Crooker, D.~G. Rickel, A.~V. Balatsky, and D.~L. Smith, Nature
\textbf{431}, 49 (2004).\\
\noindent [2] M. R\"omer, J. Hübner, and M. Oestreich, Rev. Sci.
Instrum. 78, 103903 (2007).\\
\noindent [3] G. M\"uller, M. R\"omer, D. Schuh, W. Wegscheider, J.
Hübner, and M. Oestreich, Phys. Rev.
Lett., \textbf{101} 206601 (2008).\\
\noindent [4] M. R\"omer, H. Bernien, G. M\"uller, D. Schuh, J.
H\"ubner, and M. Oestreich arXiv:0911.4084\\
\noindent [5] G. M. Müller, Michael R\"omer, Jens H\"ubner, M.
Oestreich, arXiv:0909.3406\\
\noindent [6] M. R\"omer, J. Hübner, and M. Oestreich, Appl.
Phys. Lett., \textbf{94} 112105 (2009).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.X35.4