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Cheng L, Li H, Lin G, Yan J, Zhang L, Yang C, Tong W, Ren Z, Zhu W, Cong X, Gao J, Tan P, Luo X, sun Y, Zhu W, Sheng Z. Phonon-Related Monochromatic THz Radiation and its Magneto-Modulation in 2D Ferromagnetic Cr 2 Ge 2 Te 6. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103229. [PMID: 34716689 PMCID: PMC8728850 DOI: 10.1002/advs.202103229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/23/2021] [Indexed: 05/30/2023]
Abstract
Searching multiple types of terahertz (THz) irradiation source is crucial for the THz technology. In addition to the conventional fermionic cases, bosonic quasi-/particles also promise energy-efficient THz wave emission. Here, by utilizing a 2D ferromagnetic Cr2 Ge2 Te6 crystal, first a phonon-related magneto-tunable monochromatic THz irradiation source is demonstrated. With a low-photonic-energy broadband THz pump, a strong THz irradiation with frequency ≈0.9 THz and bandwidth ≈0.25 THz can be generated and its conversion efficiency could even reach 2.1% at 160 K. Moreover, it is intriguing to find that such monochromatic THz irradiation can be efficiently modulated by external magnetic field below 160 K. According to both experimental and theoretical analyses, the emergent THz irradiation is identified as the emission from the phonon-polariton and its temperature and magnetic field dependent behaviors confirm the large spin-lattice coupling in this 2D ferromagnetic crystal. These observations provide a new route for the creation of tunable monochromatic THz source which may have great practical interests in future applications in photonic and spintronic devices.
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Affiliation(s)
- Long Cheng
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory, HFIPS, AnhuiChinese Academy of SciencesShushanhu Road 350Hefei230031China
| | - Huiping Li
- ICQDHefei National Laboratory for Physical Sciences at the Microscaleand Key Laboratory of Strongly‐Coupled Quantum Matter PhysicsChinese Academy of SciencesSchool of Physical SciencesUniversity of Science and Technology of ChinaNo. 96, JinZhai Road, Baohe DistrictHefeiAnhui230026China
| | - Gaoting Lin
- Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesShushanhu Road 350HefeiAnhui230031China
| | - Jian Yan
- Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesShushanhu Road 350HefeiAnhui230031China
| | - Lei Zhang
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory, HFIPS, AnhuiChinese Academy of SciencesShushanhu Road 350Hefei230031China
| | - Cheng Yang
- Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesShushanhu Road 350HefeiAnhui230031China
| | - Wei Tong
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory, HFIPS, AnhuiChinese Academy of SciencesShushanhu Road 350Hefei230031China
| | - Zhuang Ren
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory, HFIPS, AnhuiChinese Academy of SciencesShushanhu Road 350Hefei230031China
| | - Wang Zhu
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory, HFIPS, AnhuiChinese Academy of SciencesShushanhu Road 350Hefei230031China
| | - Xin Cong
- State Key Laboratory of Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of SciencesNo. A35, QingHua East Road, Haidian DistrictBeijing100083China
| | - Jingjing Gao
- Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesShushanhu Road 350HefeiAnhui230031China
| | - Pingheng Tan
- State Key Laboratory of Superlattices and MicrostructuresInstitute of SemiconductorsChinese Academy of SciencesNo. A35, QingHua East Road, Haidian DistrictBeijing100083China
| | - Xuan Luo
- Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesShushanhu Road 350HefeiAnhui230031China
| | - Yuping sun
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory, HFIPS, AnhuiChinese Academy of SciencesShushanhu Road 350Hefei230031China
- Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesShushanhu Road 350HefeiAnhui230031China
- Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNo. 22 Hankou Road, Gulou DistrictNanjingJiangsu210093China
| | - Wenguang Zhu
- ICQDHefei National Laboratory for Physical Sciences at the Microscaleand Key Laboratory of Strongly‐Coupled Quantum Matter PhysicsChinese Academy of SciencesSchool of Physical SciencesUniversity of Science and Technology of ChinaNo. 96, JinZhai Road, Baohe DistrictHefeiAnhui230026China
| | - Zhigao Sheng
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field Laboratory, HFIPS, AnhuiChinese Academy of SciencesShushanhu Road 350Hefei230031China
- Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNo. 22 Hankou Road, Gulou DistrictNanjingJiangsu210093China
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Dickmann S. Spin-rotation mode in a quantum Hall ferromagnet. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:015603. [PMID: 31491770 DOI: 10.1088/1361-648x/ab4230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A spin-rotation mode emerging in a quantum Hall ferromagnet due to laser pulse excitation is studied. This state, macroscopically representing a rotation of the entire electron spin-system to a certain angle, is not microscopically equivalent to a coherent turn of all spins as a single-whole and is presented in the form of a combination of eigen quantum states corresponding to all possible S z spin numbers. The motion of the macroscopic quantum state is studied microscopically by solving a non-stationary Schrödinger equation and by means of a kinetic approach where damping of the spin-rotation mode is related to an elementary process, namely, transformation of a 'Goldstone spin exciton' to a 'spin-wave exciton'. The system exhibits a spin stochastization mechanism (determined by spatial fluctuations of the Landé factor) ensuring damping, transverse spin relaxation, but irrelevant to decay of spin-wave excitons and thus not involving longitudinal relaxation, i.e. recovery of the S z number to its equilibrium value.
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Affiliation(s)
- S Dickmann
- Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, 142432, Russia
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Paul J, Stevens CE, Smith RP, Dey P, Mapara V, Semenov D, McGill SA, Kaindl RA, Hilton DJ, Karaiskaj D. Coherent two-dimensional Fourier transform spectroscopy using a 25 Tesla resistive magnet. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:063901. [PMID: 31255018 DOI: 10.1063/1.5055891] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 05/12/2019] [Indexed: 06/09/2023]
Abstract
We performed nonlinear optical two-dimensional Fourier transform spectroscopy measurements using an optical resistive high-field magnet on GaAs quantum wells. Magnetic fields up to 25 T can be achieved using the split helix resistive magnet. Two-dimensional spectroscopy measurements based on the coherent four-wave mixing signal require phase stability. Therefore, these measurements are difficult to perform in environments prone to mechanical vibrations. Large resistive magnets use extensive quantities of cooling water, which causes mechanical vibrations, making two-dimensional Fourier transform spectroscopy very challenging. Here, we report on the strategies we used to overcome these challenges and maintain the required phase-stability throughout the measurement. A self-contained portable platform was used to set up the experiments within the time frame provided by a user facility. Furthermore, this platform was floated above the optical table in order to isolate it from vibrations originating from the resistive magnet. Finally, we present two-dimensional Fourier transform spectra obtained from GaAs quantum wells at magnetic fields up to 25 T and demonstrate the utility of this technique in providing important details, which are obscured in one dimensional spectroscopy.
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Affiliation(s)
- Jagannath Paul
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
| | | | - Ryan P Smith
- Department of Physics, California State University-East Bay, Hayward, California 94542, USA
| | - Prasenjit Dey
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
| | - Varun Mapara
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
| | - Dimitry Semenov
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 30201, USA
| | - Steven A McGill
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 30201, USA
| | - Robert A Kaindl
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - David J Hilton
- Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | - Denis Karaiskaj
- Department of Physics, University of South Florida, Tampa, Florida 33620, USA
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4
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Paul J, Stevens CE, Liu C, Dey P, McIntyre C, Turkowski V, Reno JL, Hilton DJ, Karaiskaj D. Strong Quantum Coherence between Fermi Liquid Mahan Excitons. PHYSICAL REVIEW LETTERS 2016; 116:157401. [PMID: 27127985 DOI: 10.1103/physrevlett.116.157401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Indexed: 06/05/2023]
Abstract
In modulation doped quantum wells, the excitons are formed as a result of the interactions of the charged holes with the electrons at the Fermi edge in the conduction band, leading to the so-called "Mahan excitons." The binding energy of Mahan excitons is expected to be greatly reduced and any quantum coherence destroyed as a result of the screening and electron-electron interactions. Surprisingly, we observe strong quantum coherence between the heavy hole and light hole excitons. Such correlations are revealed by the dominating cross-diagonal peaks in both one-quantum and two-quantum two-dimensional Fourier transform spectra. Theoretical simulations based on the optical Bloch equations where many-body effects are included phenomenologically reproduce well the experimental spectra. Time-dependent density functional theory calculations provide insight into the underlying physics and attribute the observed strong quantum coherence to a significantly reduced screening length and collective excitations of the many-electron system.
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Affiliation(s)
- J Paul
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA
| | - C E Stevens
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA
| | - C Liu
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA
| | - P Dey
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA
| | - C McIntyre
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA
| | - V Turkowski
- Department of Physics, University of Central Florida, Orlando, Florida 32816, USA
| | - J L Reno
- CINT, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - D J Hilton
- Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | - D Karaiskaj
- Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, Florida 33620, USA
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5
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Paul J, Dey P, Tokumoto T, Reno JL, Hilton DJ, Karaiskaj D. Exploring two-dimensional electron gases with two-dimensional Fourier transform spectroscopy. J Chem Phys 2014; 141:134505. [PMID: 25296819 DOI: 10.1063/1.4896777] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The dephasing of the Fermi edge singularity excitations in two modulation doped single quantum wells of 12 nm and 18 nm thickness and in-well carrier concentration of ∼4 × 10(11) cm(-2) was carefully measured using spectrally resolved four-wave mixing (FWM) and two-dimensional Fourier transform (2DFT) spectroscopy. Although the absorption at the Fermi edge is broad at this doping level, the spectrally resolved FWM shows narrow resonances. Two peaks are observed separated by the heavy hole/light hole energy splitting. Temperature dependent "rephasing" (S1) 2DFT spectra show a rapid linear increase of the homogeneous linewidth with temperature. The dephasing rate increases faster with temperature in the narrower 12 nm quantum well, likely due to an increased carrier-phonon scattering rate. The S1 2DFT spectra were measured using co-linear, cross-linear, and co-circular polarizations. Distinct 2DFT lineshapes were observed for co-linear and cross-linear polarizations, suggesting the existence of polarization dependent contributions. The "two-quantum coherence" (S3) 2DFT spectra for the 12 nm quantum well show a single peak for both co-linear and co-circular polarizations.
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Affiliation(s)
- J Paul
- Department of Physics, University of South Florida, 4202 East Fowler Ave., Tampa, Florida 33620, USA
| | - P Dey
- Department of Physics, University of South Florida, 4202 East Fowler Ave., Tampa, Florida 33620, USA
| | - T Tokumoto
- Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | - J L Reno
- CINT, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - D J Hilton
- Department of Physics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | - D Karaiskaj
- Department of Physics, University of South Florida, 4202 East Fowler Ave., Tampa, Florida 33620, USA
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Li C, Zhai F. Crystallographic plane tuning of magnetoplasmon excitations in two-dimensional electron gas systems. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:305802. [PMID: 21747155 DOI: 10.1088/0953-8984/23/30/305802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate theoretically the magnetoplasmon spectrum of two-dimensional electron gas systems grown along different crystallographic directions, which are modulated by both the Dresselhaus spin-orbit interaction (DSOI) and the Rashba spin-orbit interaction (RSOI). Because the DSOI depends on the crystallographic orientation, the magnetoplasmon spectrum in the presence of the DSOI shows distinct features for different crystallographic planes. For some high-index planes, such as (140) and (114), the magnetoplasmon spectrum is anisotropic even under the pure-DSOI modulation, which is different from the isotropic behavior for the high-symmetry (001) plane. The coexistence of the DSOI and the RSOI leads to more drastic variations of the anisotropic magnetoplasmon spectrum in different crystallographic planes, which are revealed from the splittings of the collective excitation modes and the intensity of the spin density excitation at the anticrossing center of the splittings.
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Affiliation(s)
- Chao Li
- School of Physics and Optoelectronic Technology and College of Advanced Science and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China.
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7
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Faugeras C, Amado M, Kossacki P, Orlita M, Kühne M, Nicolet AAL, Latyshev YI, Potemski M. Magneto-Raman scattering of graphene on graphite: electronic and phonon excitations. PHYSICAL REVIEW LETTERS 2011; 107:036807. [PMID: 21838392 DOI: 10.1103/physrevlett.107.036807] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Indexed: 05/31/2023]
Abstract
Magneto-Raman-scattering experiments from the surface of graphite reveal novel features associated to purely electronic excitations which are observed in addition to phonon-mediated resonances. Graphene-like and graphite domains are identified through experiments with ∼1 μm spatial resolution performed in magnetic fields up to 32 T. Polarization resolved measurements emphasize the characteristic selection rules for electronic transitions in graphene. Graphene on graphite displays the unexpected hybridization between optical phonon and symmetric across the Dirac point inter Landau level transitions. The results open new experimental possibilities--to use light scattering methods in studies of graphene under quantum Hall effect conditions.
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Affiliation(s)
- C Faugeras
- LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France
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8
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Singha A, Gibertini M, Karmakar B, Yuan S, Polini M, Vignale G, Katsnelson MI, Pinczuk A, Pfeiffer LN, West KW, Pellegrini V. Two-Dimensional Mott-Hubbard Electrons in an Artificial Honeycomb Lattice. Science 2011; 332:1176-9. [DOI: 10.1126/science.1204333] [Citation(s) in RCA: 162] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Van'kov AB, Kulik LV, Dickmann S, Kukushkin IV, Kirpichev VE, Dietsche W, Schmult S. Cyclotron spin-flip excitations in a nu = 1/3 quantum Hall ferromagnet. PHYSICAL REVIEW LETTERS 2009; 102:206802. [PMID: 19519061 DOI: 10.1103/physrevlett.102.206802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Indexed: 05/27/2023]
Abstract
Inelastic light scattering spectroscopy discloses a novel type of cyclotron spin-flip excitation in a quantum Hall system around the nu = 1/3 filling. The excitation energy follows qualitatively the degree of electron spin polarization, reaching a maximum value at nu = 1/3. This characterizes the new excitation as a nu = 1/3 ferromagnet eigenmode. The mode energy exceeds drastically the theoretical prediction obtained within the renowned single-mode approximation. We develop a new theoretical approach where the basis set is extended by adding a double-exciton component representing the cyclotron magnetoplasmon and spin wave coupled together. This double-mode approximation, inferred to be responsible for substantially reducing the gap between theoretical and experimental results, shows that the cyclotron spin-flip excitation is effectively a four-particle state.
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Affiliation(s)
- A B Van'kov
- Institute of Solid State Physics, RAS, Chernogolovka, 142432 Russia
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Perez F, Aku-leh C, Richards D, Jusserand B, Smith LC, Wolverson D, Karczewski G. From spin flip excitations to the spin susceptibility enhancement of a two-dimensional electron gas. PHYSICAL REVIEW LETTERS 2007; 99:026403. [PMID: 17678240 DOI: 10.1103/physrevlett.99.026403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Indexed: 05/16/2023]
Abstract
The g-factor enhancement of the spin-polarized two-dimensional electron gas was measured directly over a wide range of spin polarizations, using spin flip resonant Raman scattering spectroscopy on two-dimensional electron gases embedded in Cd(1-x)Mn(x)Te semimagnetic quantum wells. At zero Raman transferred momentum, the single-particle spin flip excitation, energy Z*, coexists in the Raman spectrum with the spin flip wave of energy Z, the bare giant Zeeman splitting. We compare the measured g-factor enhancement with recent spin-susceptibility enhancement theories and deduce the spin-polarization dependence of the mass renormalization.
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Affiliation(s)
- F Perez
- Institut des NanoSciences de Paris, CNRS, Universités Paris 6 and 7, 140 rue de Lourmel, 75015 Paris, France
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Van'kov AB, Kulik LV, Kukushkin IV, Kirpichev VE, Dickmann S, Zhilin VM, Smet JH, von Klitzing K, Wegscheider W. Low-magnetic-field divergence of the electronic g factor obtained from the cyclotron spin-flip mode of the nu=1 quantum Hall ferromagnet. PHYSICAL REVIEW LETTERS 2006; 97:246801. [PMID: 17280306 DOI: 10.1103/physrevlett.97.246801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Indexed: 05/13/2023]
Abstract
We report an inelastic light scattering study of the cyclotron spin-flip mode in the two-dimensional electron system at filling nu=1. The energy of this mode can serve as a probe of the many-body exchange interaction on short length scales. Its magnetic field dependence is compared with predictions based on Hartree-Fock theory. They agree well when including the nonzero width of the electron system. From the measured energies, the exchange enhanced g factor is extracted. It diverges at small fields and differs largely from g factors obtained via transport activation studies.
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Affiliation(s)
- A B Van'kov
- Institute for Solid State Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia
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Jusserand B, Perez F, Richards DR, Karczewski G, Wojtowicz T, Testelin C, Wolverson D, Davies JJ. Spin excitations of the spin-polarized electron gas in semimagnetic quantum wells. PHYSICAL REVIEW LETTERS 2003; 91:086802. [PMID: 14525266 DOI: 10.1103/physrevlett.91.086802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2003] [Indexed: 05/24/2023]
Abstract
Collective and single-particle spin-flip excitations of a two-dimensional electron gas in a semimagnetic Cd(1-x)Mn(x)Te quantum well are observed by resonant Raman scattering. Application of a magnetic field splits the spin subbands and a spin polarization is induced in the electron gas. Above 1 T the collective modes, which disperse with the in-plane wave vector, dominate the spectra. The local spin-density approximation provides a good description of our results and enables us to confirm that the energy of the low wave vector collective mode is given by the bare Zeeman energy.
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Affiliation(s)
- B Jusserand
- CNRS/LPN, Route de Nozay, 91460 Marcoussis, France
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Mozyrsky D, Privman V, Glasser ML. Indirect interaction of solid-state qubits via two-dimensional electron gas. PHYSICAL REVIEW LETTERS 2001; 86:5112-5115. [PMID: 11384434 DOI: 10.1103/physrevlett.86.5112] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2001] [Indexed: 05/23/2023]
Abstract
We propose a mechanism of long-range coherent coupling between nuclear spin qubits in semiconductor-heterojunction quantum information processing devices. The coupling is via localized donor electrons which interact with the two-dimensional electron gas. An effective interaction Hamiltonian is derived and the coupling strength is evaluated. We also discuss mechanisms of decoherence and consider gate control of the interaction between qubits. The resulting quantum computing scheme retains all the control and measurement aspects of earlier approaches, but allows qubit spacing at distances of the order of 100 nm, attainable with the present-day semiconductor device technologies.
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Affiliation(s)
- D Mozyrsky
- Department of Physics, Clarkson University, Potsdam, New York 13699-5820, USA
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15
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Kulik LV, Kukushkin IV, Kirpichev VE, v Klitzing K, Eberl K. Modification of the intersubband excitation spectrum in a two-dimensional electron system under a perpendicular magnetic field. PHYSICAL REVIEW LETTERS 2001; 86:1837-1840. [PMID: 11290261 DOI: 10.1103/physrevlett.86.1837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2000] [Indexed: 05/23/2023]
Abstract
Under an external magnetic field, new branches of spin- and charge-density waves have been studied in a quasi-two-dimensional electron system whose ground state has more than one Landau level occupied by electrons. These collective excitations can be treated as manifestations of the multicomponent nature of the electron system in magnetic field, whereas the occupied Landau levels should be associated with degrees of freedom.
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Affiliation(s)
- L V Kulik
- Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
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Kukushkin IV, Smet JH, Eberl K. Optical investigation of spin-wave excitations in fractional quantum hall states and of interaction between composite fermions. PHYSICAL REVIEW LETTERS 2000; 85:3688-3691. [PMID: 11030982 DOI: 10.1103/physrevlett.85.3688] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2000] [Indexed: 05/23/2023]
Abstract
We demonstrate that the temperature dependence of the electron spin polarization for the fractional states nu = 1/3 and nu = 2/3 displays activated behavior. This study enables the first measurement of the fractional quantum Hall spin-flip gaps. They are found to be systematically larger in comparison with the gaps simultaneously measured in transport. For nu = 1/3 and nu = 1/2, these spin-flip gaps allow the determination of the composite fermion interaction energy. This energy is investigated as a function of the finite width of the 2D channel.
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Affiliation(s)
- IV Kukushkin
- Max-Planck-Institut fur Festkorperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany and Institute of Solid State Physics, RAS, Chernogolovka, 142432 Russia
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Hanna CB, Arovas DP, Mullen K, Girvin SM. Effect of spin degeneracy on scaling in the quantum Hall regime. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:5221-5232. [PMID: 9981707 DOI: 10.1103/physrevb.52.5221] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Nakajima T, Aoki H. Manifestation of spin degrees of freedom in the double fractional quantum Hall system. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:7874-7877. [PMID: 9977374 DOI: 10.1103/physrevb.51.7874] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bairamov BH, Voitenko VA, Ipatova IP, Negoduyko VK, Toporov VV. Discriminative temperature dependencies of differential light-scattering cross sections from an electron gas in semiconductors with a nonparabolic dispersion of energy bands. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:14923-14932. [PMID: 9975838 DOI: 10.1103/physrevb.50.14923] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Simon SH, Halperin BI. Finite-wave-vector electromagnetic response of fractional quantized Hall states. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:17368-17387. [PMID: 10008349 DOI: 10.1103/physrevb.48.17368] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Pinczuk A, Dennis BS, Pfeiffer LN, West K. Observation of collective excitations in the fractional quantum Hall effect. PHYSICAL REVIEW LETTERS 1993; 70:3983-3986. [PMID: 10054015 DOI: 10.1103/physrevlett.70.3983] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
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22
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Richards D, Jusserand B, Peric H, Etienne B. Intrasubband excitations and spin-splitting anisotropy in GaAs modulation-doped quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:16028-16031. [PMID: 10006018 DOI: 10.1103/physrevb.47.16028] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mendez EE, Nocera J, Wang WI. Oscillatory Landé factor of two-dimensional electrons under high magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:13937-13940. [PMID: 10005730 DOI: 10.1103/physrevb.47.13937] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Goñi AR, Pinczuk A, Weiner JS, Dennis BS, Pfeiffer LN, West KW. Observation of magnetoplasmons, rotons, and spin-flip excitations in GaAs quantum wires. PHYSICAL REVIEW LETTERS 1993; 70:1151-1154. [PMID: 10054299 DOI: 10.1103/physrevlett.70.1151] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Longo JP, Kallin C. Spin-flip excitations from Landau levels in two dimensions. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:4429-4439. [PMID: 10006590 DOI: 10.1103/physrevb.47.4429] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yang S, Aers GC. Magnetorotons in quasi-one-dimensional electron systems in the absence of Kohn's theorem. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:12456-12459. [PMID: 10003163 DOI: 10.1103/physrevb.46.12456] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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