Thz-Center University of Regensburg

Highlights

2023

Photocurrents in bulk tellurium
- submitted to Phys. Rev. B
Student Encouragement Award for Erwin Mönch for his contributed presentation at the 10th TeraTech conference in Aizu-Wakamatsu, Japan
Nonlinear intensity dependence of ratchet currents induced by terahertz laser radiation in bilayer graphene with asymmetric periodic grating gates
- @ J. Appl. Phys.
Terahertz spin ratchet effect in magnetic metamaterials
- @ Phys. Rev. B
Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets
- @ Phys. Rev. B
Infrared photoresistance as a sensitive probe of electronic transport in twisted bilayer graphene
- @ 2D Materials

2022

2021

2020

2019

2018

2017

2016

THz restive response of 2DTI in the regime of quasi- ballistic transport - @ JETP Letters
Photoresponse saturation at intense THz radiation in AlGaN/GaN HEMT detector - @ Journal of Applied Physics
E.L. Ivchenko and S.D. Ganichev, Spin Photogalvanics in Spin Physics in Semiconductors, @ Springer Verlag 2016, second edition, extended
Spin orientation by electric current in Handbook of Spin Transport and Magnetism, @ Chapman and Hall 2016, second edition, extended
Manifestation of topological surface electron states in the photoelectromagnetic effect induced by terahertz laser radiation - @ Semiconductor Science and Technology
Circular photon drag effect in bulk tellurium - published @ Physical Review B
Opto-Electronic Characterization of Three Dimensional Topological Insulators - @ Journal of Applied Physics
Kick-off Meeting of the Trilateral Partnerships - Cooperation Projects between Scholars and Scientists from Ukraine, Russia and Germany:
"Opto-electronic and transport phenomena in narrow gap semiconductor structures for terahertz detection"
MIRO-like oscillations of magneto-resistivity in GaAs heterostructures induced by THz radiation - @ Physical Review B
Photon drag effect in (Bi_1-xSb_x)₂Te₃ three-dimensional topological insulators - @ Physical Review B
Terahertz ratchet effects in graphene with a lateral superlattice - @ Physical Review B

2015

Helicity sensitive terahertz radiation detection by dual-grating-gate high electron mobility transistors - @ Journal of Applied Physics
Noncentrosymmetric plasmon modes and giant terahertz photocurrent in a two-dimensional plasmonic crystal - @ Physical Review B
Detection of highly conductive surface electron states in topological crystalline insulators Pb_1-xSn_xSe using laser terahertz radiation - @ Nature Scientific Reports
All-optical evaluation of spin-orbit interactions based on diffusive spin motion in a two dimensional electron gas - @ Appl. Phys. Lett.
Universal ultrafast detector for short optical pulses based on graphene - @ Optics Express
AlGaN/GaN HEMTs photoresponse to high intensity THz radiation - @ Opto-Electron. Rev.
Magnetooptical Study of Zeeman E_ect in Mn modulation-doped InAs/InGaAs/InAlAs Quantum Well Structures - @ J. Appl. Phys.
Cyclotron Resonance Assisted Photocurrents in Surface States of a 3D Topological Insulator Based on a Strained High Mobility HgTe Film - @ PRB
Best Student Poster Award for H. Plank at the "1st International Workshop on Topological Electronics (Topotronics2015)" in Okinawa, Japan

2014

October 14: Quantum Oscillations of Photogalvanic Effect and Spin Orbit Interaction Effect in HgTe Quantum Wells with Parabolic and Dirac Dispersion - accepted @ PRB
July 14: Room temperature high frequency transport of Dirac fermions in epitaxially grown Sb2Te3 based topological insulators - accepted to be PRL Editors' Suggestion
May 14: Terahertz Electron Transport in a Two-Dimensional Topological Insulator in a HgTe Quantum Well - publication @ JETP Letters
April 14: Magnetic quantum ratchet effect in Si-MOSFETs - accepted for publication @ J. Phys.: Condens. Matter
April 14: Nonlinear photoresponse of field effect transistors terahertz detectors at high irradiation intensities - accepted for publication @ J. Appl. Phys.
April 14: Transport properties of a 3D topological insulator based on a strained high mobility HgTe film - accepted for publication @ PRL
April 14: Terahertz split-ring-metamaterials as transducers for chemical sensors based on conducting polymers: a feasibility study with sensing of acidic and basic gases using polyaniline chemosensitive layer - accepted @ Microchimica Acta
March 14: Interplay of Rashba/Dresselhaus spin splittings probed by photogalvanic spectroscopy - published @ Physica Status Solidi (b)
February 14: Room temperature high frequency transport of Dirac fermions in epitaxially grown Sb2Te3 based topological insulators - published @arxiv
February 14: High intensity study of THz detectors based on field effect transistors - published @arxiv
February 14: High frequency electric field induced nonlinear effects in graphene - published @ Physics Reports
January 14: Magneto-Photoluminescence of InAs/InGaAs/InAlAs quantum well structures - published @ Applied Physics Letters

2013

December 13: Magnetic quantum ratchet effect in Si-MOSFETs - published @ arxiv.org
December 13: Cyclotron-resonance-assisted photon drag effect in InSb/InAlSb quantum wells excited by terahertz radiation - published @ arxiv.org
September 13: In vitro optical detection of simulated blood pulse in a human tooth pulp model - published @ Springer-Verlag, DOI 10.1007/s00784-013-1115-z
August 13: Reststrahl band assisted photocurrents in epitaxial graphene layers - published @ Phys. Rev. B.
June 13: Giant spin-polarized current in a Dirac fermion system at cyclotron resonance - published @ Phys. Rev. B - rapid communication
June 13: Device for measuring the state of the polarization of an incident wave of frequency 10 GHZ and 30 THZ - submitted to the European Patent Register
January 13: Magnetic Quantum ratchet effect in graphene - published @ Nature Nanotechnology.
January 13: Terahertz Radiation Induced Magnetoresistance Oscillations of a High Density and High Mobility two Dimensional Electron Gas - published @ JETP letters
January 13: Terahertz polarization conversion with quartz waveplate sets - published @ Applied Optics.

2012

November 12: Dependence of the Dresselhaus spin-orbit interaction on the quantum well width - published at Phys. Rev. B
August 12: Gate-controlled persistent spin helix state in (In,Ga)As quantum wells - published at Phys. Rev. B - Rapid Communications
August 12: Spin-polarized electric currents in diluted magnetic semiconductor heterostructuresinduced by terahertz and microwave radiation - published at Phys. Rev. B as Editors' Suggestion
June 12: Helicity sensitive terahertz radiation detection by field effect transistors - published at Journal of Applied Physics
January 12: Terahertz polarization analyzer based on field effect transistors - Submitted to the CNRS patent office.
January 12: Spectroscopic Study of Human Teeth and Blood from Visible to Terahertz Frequencies for Clinical Diagnosis of Dental Pulp Vitality - published at Int. J. Infrared, Millimeter and Terahertz Waves.
January 12: Prof. E. Ivchenko becomes a member of the Russian Academy of Sciences: Our congratulations!
January 12: Sergey Tarasenko, Eugenious Ivchenko, Vasily Bel'kov and Sergey Ganichev recieved A. F. Ioffe Institute Award: Our congratulations!
January 12: Interplay of spin and orbital magnetogyrotropic photogalvanic effects in InSb/AlInSb quantum well structures - published at Phys. Rev. B.

2011

December 11: Cyclotron resonance of Dirac fermions in HgTe/CdHgTe quantum wells published at JETP Lett., Russian version : Pisma v ZhETP 94, 895-899 (2011).
December 11: Terahertz radiation driven chiral edge currents in graphene - published at Phys. Rev. Lett.
November 11: Ratchet effects in quantum wells with a lateral superlattice - published at JETP Lett.
September 11: S.D. Ganichev, M. Trushin, and J. Schliemann, Spin orientation by electric current in Handbook of Spin Transport and Magnetism eds. I. Zutic and E. Y. Tsymbal (chapman and Hall 2011) pp. 487-497. ISBN: 1439803773.
September 11: Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO2 laser - published at Phys. Rev. B
August 11: Exchange interaction of electrons with Mn in hybrid AlSb/InAs/ZnMnTe structures - published at Appl. Phys. Lett.
July 11: We congratulate Johannes Karch for having success in his doctoral examination.
April 11: Classical ratchet effects in heterostructures with a lateral periodic potential - published at Phys. Rev. B
April 11: Spin and orbital mechanisms of the magneto-gyrotropic photogalvanic effects in GaAs/AlGaAs quantum well structures - published at Phys. Rev. B
March 11: Photoexcitation of valley-orbit currents in (111)-oriented silicon metal-oxide-semiconductor field-effect transistors - accepted by Phys. Rev. B Rapid Communications as Editors' Suggestion
February 11: The 5th THz Frischlinge Meeting 2011 will take place at Regensburg from 06 to 08 June 2011.
February 11: The 4th Annual Meeting of the German Terahertz Center and the 6th Regensburg Workshop on Quantum Heterostructures and THz Electronics will take place at Regensburg from 28 to 29 March 2011.

2010

November 10: Dynamic Hall Effect Driven by Circularly Polarized Light in a Graphene Layer - published at Phys. Rev. Lett.
November 10: We welcome two new members, AG Sch�ller and AG Huber, to the Russian-German Terahertz Center and present the new webpage.
November 10: Spin polarized electric currents in semiconductor heterostructures induced by microwave radiation - published at Appl. Phys. Lett.
October 10: Our contribution "Photon helicity driven electric currents and ratchet effects in graphene" to the SPP 1459 "Graphene" is confirmed.
August 10: Orbital photogalvanic effects in quantum-confined structures - published at J. Phys.: Condens. Matter
August 10: Circular photogalvanic effect in HgTe/CdHgTe quantum well structures - published at Semicond. Sci. Technol.
July 10: We congratulate Peter Olbrich for having success in his doctoral examination.
March 10: We congratulate Helgi Diehl for having success in his doctoral examination.
February 10: First Workshop of the German-Russian THz Center "Terahertz Radiation Induced Photocurrents" (Programm) and (Photo).
February 10: Photon helicity driven electric currents in graphene - arXiv cond. mat.
January 10: We are glad to be part of the DAAD-Ostpartnerschaften-Programm together with the Lomonossov University Moscow.

2009

December 09: We are glad to be part of the application centre "Miniaturisierte Sensorik" of the Fachhochschule Regensburg.
December 09: German-Russian Center for Terahertz research and technology founded. This center supported by the BMBF is aimed to extend the scientific collaboration between the two countries.
December 09: Orbital photogalvanic effects in quantum-confined structures - submitted to Phys. Rev. B
August 09: Ratchet Effects Induced by Terahertz Radiation in Heterostructures with a Lateral Periodic Potential - accepted by Phys. Rev. Lett.
August 09: Nonlinear magneto-gyrotropic photogalvanic effect - accepted by Phys. Rev. B
June 09: Magnetogyrotropic photogalvanic effect and spin dephasing in (110)-grown GaAs/AlGaAs quantum well structures - accepted by Phys. Rev. B
June 09: Tuning of structure inversion asymmetry by the delta-doping position in (001)-grown GaAs quantum wells - accepted by Appl. Phys. Lett.
April 09: Spin Currents in Diluted Magnetic Semiconductors - accepted by Phys. Rev. Letters
March 09: Observation of the orbital circular photogalvanic effect - accepted by Phys. Rev. B Rapid Comm.
January 09: Fast detector of the ellipticity of infrared and terahertz radiation based on HgTe quantum well structures - accepted by J. Appl. Physics

2008

November 08: Spin currents in diluted magnetic semiconductors - arxiv
October 08: Fast detector of the ellipticity of infrared and terahertz radiation based on HgTe quantum well structures - accepted by J. Appl. Physics
September 08: Resonant circular photogalvanic effect in GaN/AlGaN heterojunctions - accepted by Phys. Rev. B
August 08: Photogalvanic effects due to quantum interference in optical transitions demonstrated by terahertz radiation absorption in Si-MOSFETs - arxiv
August 08: Ratchet effects induced by terahertz radiation in heterostructures with a lateral periodic potential - arxiv
July 08: We congratulate Wolfgang Weber for having success in his doctoral examination.
May 08: Magneto-gyrotropic effects in semiconductor quantum wells - accepted by Semiconductor Science and Technology
May 08: Quantum ratchet effects induced by terahertz radiation in GaN-based two-dimensional structures - accepted by Phys. Rev. B
April 08: All-electric detectors of the polarization state of terahertz laser radiations - accepted by J. Appl. Physics
April 08: Symmetry and spin dephasing in (110)-grown quantum wells - accepted by Phys. Rev. Lett.
January 08: 5th Regensburg Workshop on Quantum Heterostructures and Terahertz Electronics

2007

Dezember 07: Symmetry and spin dephasing in (110)-grown quantum wells - submitted to arXiv
November 07: Magneto-gyrotropic photogalvanic effects in GaN/AlGaN two-dimensional systems - Solid State Communications
August 07: Cyclotron resonance photoconductivity of a two-dimensional electron gas in HgTe quantum wells - arXiv
July 07: All-electric detectors of the polarization state of terahertz laser radiations - arXiv
July 07: Magneto-gyrotropic photogalvanic effects due to inter-subband absorption in quantum wells - Condensed Matter
27. July 07: We congratulate S. D. Ganichev for his "best lecture (laser physics)" award in WS 06/07
23. July 07: We congratulate Stephan Giglberger for having success in his doctoral examination
13. July 07: We congratulate Bernhard Wittmann for his "best young scientist talk" award at NGS-13, Guildford UK!
5. June 07: Feierliche Eröffnung des Terahertz Centers (TerZ)
May 07: Prof. E.L. Ivchenko is awarded Merkator professorship: He will work at Regensburg University from 2007-2009 regularly.
May 07: Rashba and Dresselhaus Spin-Splittings in Semiconductor Quantum Wells Measured by Spin Photocurrents (GaAs and InAs structures of various design)
April 07: Spintronics aided by terahertz exposure - W. Prettl and S.D. Ganichev - SPIE, Newsroom
February 07: new FIR-Fourier Spectrometer an optically pumped FIR laser are installed
January 07: Pure spin currents induced by spin-dependent scattering processes in SiGe quantum well structures - Phys. Rev. B
DFG SPP 1285 and our project "Investigation of Rashba and Dresselhaus spin-splittings in semiconductor quantum wells" is approved

2006

October:HBFG 134/317-1 FIR-Fourier Spectrometer is approved
October:HBFG 134/320-1 optically pumped FIR laser is approved
October: Pure spin currents and zero-bias spin separation in SiGe QWs
October: Spin photocurrents in (110)-grown QW structures
October: Observation of the circular photon drag effect
September: Extended paper on the zero-bias spin separation is published in Nature Physics
August: preprint of a review paper on: Spin-galvanic effect and spin orientation by current in non-magnetic semiconductors
June: High spin polarization of optically-oriented trions in p-doped GaAs-AlGaAs quantum wells
May: Zero-bias spin seperation
January: Electric current induced spin orientation in quantum well structures (extended study)
Intense Terahertz Excitation of Semiconductors Book is published
SFB 689 C1: and our projecct "Spinphotostr�me in Quantentr�gen und niederdimensionalen lateralen Halbleiter-�bergittern und rein elektrische Spininjektion durch Spin-Bahn-Wechselwirkung in gryrotropen Nanostrukturen" are approved
GRK 638 and our project "A5 Terahertzinduzierte Photostr�me in Halbleiter-Nanostrukturen" are approved

2005

September: Demonstration of Rashba spin splitting in GaN-based heterostructures
August: Manifestation of Pure Spin Currents Induced by Spin Dependent Electron-Phonon Interaction
January: Magneto-Gyrotropic Photogalvanic Effects in QWs
January: Gate voltage controlled spin photocurrents in heterojunctions

2004

July: spin relaxation in p-type GaAs quantum wells
June: Rashba/Dresselhaus ratio measured by the spin galvanic effect
March: Spin orientation by current