51
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Teran FJ, Potemski M, Maude DK, Plantier D, Hassan AK, Sachrajda A, Wilamowski Z, Jaroszynski J, Wojtowicz T, Karczewski G. Collective character of spin excitations in a system of Mn2+ spins coupled to a two-dimensional electron gas. PHYSICAL REVIEW LETTERS 2003; 91:077201. [PMID: 12935049 DOI: 10.1103/physrevlett.91.077201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2002] [Indexed: 05/24/2023]
Abstract
We have studied the low energy spin excitations in n-type CdMnTe based dilute magnetic semiconductor quantum wells. For magnetic fields for which the energies for the excitation of free carriers and Mn spins are almost identical, an anomalously large Knight shift is observed. Our findings suggest the existence of a magnetic-field-induced ferromagnetic order in these structures, which is in agreement with recent theoretical predictions [Phys. Rev. Lett. 91, 077202 (2003)]].
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Desrat W, Maude DK, Potemski M, Portal JC, Wasilewski ZR, Hill G. Resistively detected nuclear magnetic resonance in the quantum hall regime: possible evidence for a Skyrme crystal. PHYSICAL REVIEW LETTERS 2002; 88:256807. [PMID: 12097116 DOI: 10.1103/physrevlett.88.256807] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2002] [Indexed: 05/23/2023]
Abstract
Resistively detected nuclear magnetic resonance measurements have been performed on a high mobility heterostructure in the quantum Hall regime. At millikelvin temperatures the nuclear resonances are observed in the vicinity of various integer and fractional filling factors without previous dynamic nuclear polarization. Near nu = 1, the observed large enhancement of the resonance amplitude accompanied by a reduction of T1 strongly suggests a greatly increased coupling between the electronic and nuclear spin systems. This is consistent with the proposed coupling of the nuclear spin system to the Goldstone mode of the Skyrme crystal.
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Teran FJ, Potemski M, Maude DK, Andrearczyk T, Jaroszynski J, Karczewski G. Pauli paramagnetism and Landau level crossing in a modulation doped CdMnTe/CdMgTe quantum well. PHYSICAL REVIEW LETTERS 2002; 88:186803. [PMID: 12005710 DOI: 10.1103/physrevlett.88.186803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2002] [Indexed: 05/23/2023]
Abstract
Electrical transport measurements are reported on a 2DEG in a CdMnTe quantum well structure. The amplitude of the Shubnikov-de Haas oscillations show a distinct beating pattern with nodes corresponding to coincidences between the spin splitting and a half integer multiple of the cyclotron energy. The observed pattern of nodes is a direct consequence of the large Pauli paramagnetism induced by the s-d exchange interaction between the spins of electronic states and the localized magnetic moments.
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54
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Poulter AJ, Zeman J, Maude DK, Potemski M, Martinez G, Riedel A, Hey R, Friedland KJ. Magneto infrared absorption in high electron density GaAs quantum wells. PHYSICAL REVIEW LETTERS 2001; 86:336-339. [PMID: 11177825 DOI: 10.1103/physrevlett.86.336] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2000] [Indexed: 05/23/2023]
Abstract
Magneto infrared absorption measurements have been performed in a highly doped GaAs quantum well which has been lifted off and bonded to a silicon substrate, in order to study the resonant polaron interaction. It is found that the pinning of the cyclotron energy occurs at an energy close to that of the transverse optical phonon of GaAs. This unexpected result is explained by a model taking into account the full dielectric constant of the quantum well.
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55
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Nicholas RJ, Takashina K, Lakrimi M, Kardynal B, Khym S, Mason NJ, Symons DM, Maude DK, Portal JC. Metal-insulator oscillations in a two-dimensional electron-hole system. PHYSICAL REVIEW LETTERS 2000; 85:2364-2367. [PMID: 10978011 DOI: 10.1103/physrevlett.85.2364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/1999] [Indexed: 05/23/2023]
Abstract
The electrical transport properties of a bipolar InAs/GaSb system have been studied in a magnetic field. The resistivity oscillates between insulating and metallic behavior while the quantum Hall effect shows a digital character oscillating from 0 to 1 conductance quantum e(2)/h. The insulating behavior is attributed to the formation of a total energy gap in the system. A novel looped edge state picture is proposed associated with the appearance of a voltage between Hall probes which is symmetric on magnetic field reversal.
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Maude DK, Potemski M, Portal JC, Henini M, Eaves L, Hill G, Pate MA. Spin Excitations of a Two-Dimensional Electron Gas in the Limit of Vanishing Landé g Factor. PHYSICAL REVIEW LETTERS 1996; 77:4604-4607. [PMID: 10062580 DOI: 10.1103/physrevlett.77.4604] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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57
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Kleber X, Gusev GM, Gennser U, Maude DK, Portal JC, Lubyshev DI, Basmaji P, Rossi JC, Nastaushev YV. Chaotic electron dynamics around a single elliptically shaped antidot. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:13859-13867. [PMID: 9985302 DOI: 10.1103/physrevb.54.13859] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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58
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Gassot P, Genoe J, Maude DK, Portal JC, Dalton KS, Symons DM, Nicholas RJ, Aristone F, Palmier JF, Laruelle F. Magnetophonons in short-period superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:14540-14549. [PMID: 9985460 DOI: 10.1103/physrevb.54.14540] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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59
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Gusev GM, Gennser U, Kleber X, Maude DK, Portal JC, Lubyshev DI, Basmaji P, Silva M, Rossi JC, Nastaushev YV. Quantum interference effects in a strongly fluctuating magnetic field. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:13641-13644. [PMID: 9983110 DOI: 10.1103/physrevb.53.13641] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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60
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Daly MS, Dalton KS, Lakrimi M, Mason NJ, Nicholas RJ, Walker PJ, Maude DK, Portal JC. Zero-Hall-resistance state in a semimetallic InAs/GaSb superlattice. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:R10524-R10527. [PMID: 9982722 DOI: 10.1103/physrevb.53.r10524] [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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61
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Coppinger F, Genoe J, Maude DK, Gennser U, Portal JC, Singer KE, Rutter P, Taskin T, Peaker AR, Wright AC. Single domain switching investigated using telegraph noise spectroscopy: possible evidence for macroscopic quantum tunneling. PHYSICAL REVIEW LETTERS 1995; 75:3513-3516. [PMID: 10059605 DOI: 10.1103/physrevlett.75.3513] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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62
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Nogaret A, Maude DK, Portal JC, Maldonado MA, Martin KP, Carnahan RE, Higgins RJ, Lee H, Cho AY. Influence of electrode Fermi energy on interband tunneling. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:13198-13202. [PMID: 9978119 DOI: 10.1103/physrevb.51.13198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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63
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Hayden RK, Eaves L, Henini M, Maude DK, Portal JC. Intrinsic bistability and hole-charge buildup in asymmetric p-type resonant-tunneling structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:10745-10748. [PMID: 10009906 DOI: 10.1103/physrevb.49.10745] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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64
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Hayden RK, Valadares EC, Henini M, Eaves L, Maude DK, Portal JC. Reply to "Comment on 'Anisotropy of the confined hole states in a (311)A AlAs/GaAs/AlAs quantum-well system: Evidence for a camel's-back band structure' ". PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:8501. [PMID: 10009623 DOI: 10.1103/physrevb.49.8501] [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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65
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Nogaret A, Maldonado MA, Carnahan RE, Martin KP, Higgins RJ, Aristone F, Maude DK, Portal JC, Chen JF, Cho AY. Resonant and off-resonant phenomena in double-barrier interband tunneling structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:13872-13875. [PMID: 10005712 DOI: 10.1103/physrevb.47.13872] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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66
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Hayden RK, Valadares EC, Henini M, Eaves L, Maude DK, Portal JC. Anisotropy of the confined hole states in a (311)A AlAs/GaAs/AlAs quantum-well system: Evidence for a camel's-back band structure. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:15586-15589. [PMID: 10003696 DOI: 10.1103/physrevb.46.15586] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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67
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Hayden RK, Maude DK, Eaves L, Valadares EC, Henini M, Sheard FW, Hughes OH, Portal JC, Cury L. Probing the hole dispersion curves of a quantum well using resonant magnetotunneling spectroscopy. PHYSICAL REVIEW LETTERS 1991; 66:1749-1752. [PMID: 10043297 DOI: 10.1103/physrevlett.66.1749] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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68
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Maude DK, Eaves L, Foster TJ, Portal JC. Evidence against the negative-charge-state model for the DX center in n-type GaAs. PHYSICAL REVIEW LETTERS 1989; 62:1922. [PMID: 10039806 DOI: 10.1103/physrevlett.62.1922] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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69
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Snell BR, Chan KS, Sheard FW, Eaves L, Toombs GA, Maude DK, Portal JC, Bass SJ, Claxton P, Hill G, Pate MA. Observation of magnetoquantized interface states by electron tunneling in single-barrier n-(InGa)As-InP-n+(InGa)As heterostructures. PHYSICAL REVIEW LETTERS 1987; 59:2806-2809. [PMID: 10035653 DOI: 10.1103/physrevlett.59.2806] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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70
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Maude DK, Portal JC, Dmowski L, Foster T, Eaves L, Nathan M, Heiblum M, Harris JJ, Beall RB. Investigation of the DX center in heavily doped n-GaAs. PHYSICAL REVIEW LETTERS 1987; 59:815-818. [PMID: 10035878 DOI: 10.1103/physrevlett.59.815] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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