Control of Elementary Excitations by Acoustic Fields

Spin transport and manipulation in GaAs (110) and (111) quantum wells using surface acoustic waves

The spatial potential modulation induced by a surface acoustic wave (SAW) in semiconductor structures provides an effective way of transporting charge and spins in GaAs quantum wells. The type-II potential modulation spatially separates electrons and holes, thus extending the recombination lifetime and transporting them over long distances at the SAW velocity. The electron-hole separation also reduces the exchange interaction between photoexcited electrons and holes, thus prolonging their spin lifetimes to values above 20 ns.

 

This project is inserted within the Priority Program "Semiconductor Spintronics" of the Deutsche Forschungsgemeinschaft (DFG) and aims at the transport and manipulation of spins at high temperatures (up to room temperatures) by combining the transport by acoustic fields with the special symmetry of GaAs (110) and (111) QWs. Emphasis is placed now on the growth of GaAs (111) structures, the generation of strong acoustic fields for efficient spin transport as well as on basic studies and control of the spin dynamics using electric, magnetic, and strain fields. The new concepts introduced here will open up new perspectives for applications in spintronic devices.

Selected Publications

7 Author A. Hernández-Mínguez , K. Biermann , R. Hey , P. V. Santos
Title

Electric control of spin transport in GaAs(111) quantum wells

Source Phys. Rev. B , 94 , 125311 ( 2016 )
DOI : 10.1103/PhysRevB.94.125311 | Download: PDF | 2717 Cite : Bibtex RIS
A. Hernández-Mínguez, K. Biermann, R. Hey, and P. V. Santos

6 Author A. Hernández-Mínguez , K. Biermann , R. Hey , P. V. Santos
Title

Spin Control and manipulation in (111) GaAs quantum wells

Source Proc. SPIE , 9167 , 916721 ( 2014 )
DOI : 10.1117/12.2060837 | Download: PDF | 2627 Cite : Bibtex RIS
A. Hernández-Mínguez, K. Biermann, R. Hey, and P. V. Santos

5 Author A. Hernández-Mínguez , K. Biermann , R. Hey , P. V. Santos
Title

Spin transport and spin manipulation in GaAs (110) and (111) quantum wells

Source Phys. Status Solidi B , 251 , 1736 ( 2014 )
DOI : 10.1002/pssb.201350202 | 2535 Cite : Bibtex RIS
A. Hernández-Mínguez, K. Biermann, R. Hey, and P. V. Santos

4 Author A. Hernández-Mínguez , K. Biermann , R. Hey , P. V. Santos
Title

Electrical suppression of spin relaxation in GaAs(111)B quantum wells

Source Phys. Rev. Lett. , 109 , 266602 ( 2012 )
Download: PDF | 2375 Cite : Bibtex RIS
A. Hernández-Mínguez, K. Biermann, R. Hey, and P. V. Santos

3 Author K. Biermann , A. Hernández-Mínguez , R. Hey , P. V. Santos
Title

Electrically tunable electron spin lifetimes in GaAs(111)B quantum wells

Source J. Appl. Phys. , 112 , 083913 ( 2012 )
Download: PDF | 2364 Cite : Bibtex RIS
K. Biermann, A. Hernández-Mínguez, R. Hey, and P. V. Santos

2 Author A. Hernández-Mínguez , K. Biermann , S. Lazic , R. Hey , P. V. Santos
Title

Kerr detection of acoustic spin transport in GaAs (110) quantum wells

Source Appl. Phys. Lett. , 97 , 242110 ( 2010 )
Download: PDF | 2168 Cite : Bibtex RIS
A. Hernández-Mínguez, K. Biermann, S. Lazic, R. Hey, and P. V. Santos

1 Author F. Alsina , P. V. Santos , H.-P. Schönherr , R. Nötzel , K. H. Ploog
Title

Real-time dynamics of the acoustically induced carrier transport in GaAs quantum wires

Source Phys. Rev. B , 67 , 161305(R) ( 2003 )
Download: PDF | 17 Cite : Bibtex RIS
F. Alsina, P. V. Santos, H.-P. Schönherr, R. Nötzel, and K. H. Ploog

Contact

Dr. Paulo V. Santos

Senior Scientist

+49 30 20377-221

lab: -360, -340, -343

santos@pdi-berlin.de