Spin-split de Haas–van Alphen effect in two-dimensional electron systems

Itskovsky, M. A.; Askénazy, S.; Maniv, T.; Vagner, I. D.; Balthes, E.; Schweitzer, Dieter

doi:10.1103/physrevb.58.r13347

Cited by 14 publications

(14 citation statements)

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“…138,145 κ-(ET) 2 I 3 is an electronically extreme twodimensional organic metal with a supercoducting transition, and this makes it an interesting and promising model system for investigation of the effects of two dimensionality onto normal and superconducting state properties. 27,134,[145][146][147][148][149] In particular, recently measured dHvA and SdH oscillations in κ-(ET) 2 I 3 exhibit a dramatic appearance at low temperatures of a significant oscillatory structure cor-…”

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confidence: 98%

Molecular Conductors and Superconductors Based on Trihalides of BEDT-TTF and Some of Its Analogues

2004

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confidence: 98%

Molecular Conductors and Superconductors Based on Trihalides of BEDT-TTF and Some of Its Analogues

2004

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“…The anomalous spin-splitting effects are also shown to exist in the fixed N systems [17][18][19][20] . The quantum interference oscillations have been confirmed by the experiments of the dHvA effect in various two-dimensional and quasi-two dimensional systems such as the quasi-two-dimensional organic conductors 21 (κ-(BEDT-TTF) 2 Cu(NCS) 2 22,23 and α-(BEDT-TTF) 2 KHg(SCN) 4 24 ), Sr 2 RuO 4 25-27 , GaAs/AlAs heterointerface 28 and In x Ga 1−x As single quantum well structure 29 .…”

Section: Introductionmentioning

confidence: 88%

de Haas–van Alphen effect in two-dimensional and quasi-two-dimensional systems

Kishigi

Hasegawa

2002

Phys. Rev. B

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We study the de Haas-van Alphen (dHvA) oscillation in two-dimensional and quasi-two-dimensional systems. We give a general formula of the dHvA oscillation in two-dimensional multi-band systems. By using this formula, the dHvA oscillation and its temperature-dependence for the twoband system are shown. By introducing the interlayer hopping tz, we examine the crossover from the two-dimension, where the oscillation of the chemical potential plays an important role in the magnetization oscillation, to the three-dimension, where the oscillation of the chemical potential can be neglected as is well know as the Lifshitz and Kosevich formula. The crossover is seen at 4tz ∼ 8tabH/φ0, where a and b are lattice constants, φ0 is the flux quantum and 8t is the width of the total energy band. We also study the dHvA oscillation in quasi-two-dimensional magnetic breakdown systems. The quantum interference oscillations such as β-α oscillation as well as the fundamental oscillations are suppressed by the interlayer hopping tz, while the β+α oscillation gradually increases as tz increases and it has a maximum at tz/t ≈ 0.025. This interesting dependence on the dimensionality can be observed in the quasi-two-dimensional organic conductors with uniaxial pressure.

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“…2 and 3 and for spin-split sharp levels in Ref. 13. We will provide here the final general expressions, which are valid also for broadened levels.…”

Section: Chemical Potential and Magnetization Oscillations In 2d mentioning

confidence: 97%

“…The field independent spin-splitting parameter s(G)ϭ⌬ s /ប c ϭ͉GϪI(G)͉ was introduced in Ref. 13. ⌬ s ϳB is the spin-splitting energy between nearest levels with spin up and down, Gϵ(g/2)m c /m e , I(G) is the nearest integer to the value of G, m c ϭm c0 /cos ⌰, and m c0 is the cyclotron mass at ⌰ϭ0.…”

Section: Chemical Potential and Magnetization Oscillations In 2d mentioning

confidence: 99%

“…Not only the fundamental frequency and amplitude ͑cyclotron mass͒ but also the precise wave form of oscillations has become the object of investigations, [6][7][8] including magnetoquantum oscillations with spin-split structure. [9][10][11][12][13][14] These investigations give valuable information about the more complex Fermi surface in quasi-2D organic metals containing both closed and open parts. Challenging problems remaining are taking proper account of the spin splitting and broadening of Landau levels, especially concerning the functional form of the magnetic subband density of states ͑DOS͒ ͑Lorentzian or Gaussian, etc.͒ and its influence on the amplitude and wave form of the oscillations.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoquantum oscillations in two-dimensional electron systems with Lorentzian broadened spin-split Landau levels and background electron reservoir states

Itskovsky

2001

Phys. Rev. B

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A theory of magnetization ͑de Haas-van Alphen͒ oscillations in two-dimensional ͑2D͒ electron systems with sharp and Lorentzian broadened spin-split Landau levels is developed in the formalism of the level approach. The influence of thermodynamic equilibrium transfer of electrons between closed and open parts of the Fermi surface is taken into account ͑the reservoir of electrons on magnetically unperturbed states͒. Analytical expressions for calculation of wave forms and amplitudes are obtained for ultralow temperatures ͑in the sense k B TϽ⌫ L , where ⌫ L is the Lorentzian broadening͒. It is shown that electron transfer determines all the wave forms of spin-split oscillations ͑stretching from inverse sawtooth for fixed chemical potential to sawtooth at constant number of electrons in spin-split levels, including all shapes between in conditions of moderate degree of transfer͒. The conditions are considered for spin-split structure to occur depending on the level broadening and the tilt angle between the magnetic field direction and the normal to the 2D plane.

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Spin-split de Haas–van Alphen effect in two-dimensional electron systems

Cited by 14 publications

References 11 publications

Molecular Conductors and Superconductors Based on Trihalides of BEDT-TTF and Some of Its Analogues

Molecular Conductors and Superconductors Based on Trihalides of BEDT-TTF and Some of Its Analogues

de Haas–van Alphen effect in two-dimensional and quasi-two-dimensional systems

Magnetoquantum oscillations in two-dimensional electron systems with Lorentzian broadened spin-split Landau levels and background electron reservoir states

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