Artículos de revistas: "Disordered quantum systems"

1

D’Errico, Chiara y Marco G. Tarallo. "One-Dimensional Disordered Bosonic Systems". Atoms 9, n.º 4 (14 de diciembre de 2021): 112. http://dx.doi.org/10.3390/atoms9040112.

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Disorder is everywhere in nature and it has a fundamental impact on the behavior of many quantum systems. The presence of a small amount of disorder, in fact, can dramatically change the coherence and transport properties of a system. Despite the growing interest in this topic, a complete understanding of the issue is still missing. An open question, for example, is the description of the interplay of disorder and interactions, which has been predicted to give rise to exotic states of matter such as quantum glasses or many-body localization. In this review, we will present an overview of experimental observations with disordered quantum gases, focused on one-dimensional bosons, and we will connect them with theoretical predictions.

2

Golubev, Dmitrii y Andrei Zaikin. "Quantum Decoherence in Disordered Mesoscopic Systems". Physical Review Letters 81, n.º 5 (agosto de 1998): 1074–77. http://dx.doi.org/10.1103/physrevlett.81.1074.

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3

Rieger, Heiko. "Disordered systems near quantum critical points". Physica A: Statistical Mechanics and its Applications 266, n.º 1-4 (abril de 1999): 471–76. http://dx.doi.org/10.1016/s0378-4371(98)00633-5.

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4

Efetov, K. B. "Quantum disordered systems with a direction". Physical Review B 56, n.º 15 (15 de octubre de 1997): 9630–48. http://dx.doi.org/10.1103/physrevb.56.9630.

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5

Rieger, Heiko. "Disordered systems near quantum critical points". Computer Physics Communications 121-122 (septiembre de 1999): 505–9. http://dx.doi.org/10.1016/s0010-4655(99)00393-8.

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6

Kree, R. "Dynamics of disordered interacting quantum systems". Zeitschrift f�r Physik B Condensed Matter 65, n.º 4 (diciembre de 1987): 505–13. http://dx.doi.org/10.1007/bf01303773.

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7

Orignac, E. y R. Chitra. "Disordered quantum smectics". Journal de Physique IV 12, n.º 9 (noviembre de 2002): 261–62. http://dx.doi.org/10.1051/jp4:20020410.

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We study the effect of disorder on the properties of the Quantum Hall smectic state arising in two dimciisional electron systems in high Landau levels. We use the replica trick and the Gauzsian Variational method to treat the disorder. We find that the quantum smectics are rather different from the usual classical smectics in that the density correlations along the direction of the stripes manifest a Bragg-Glass type behaviour whereas those in the transverse direction are infra-red divergent. This results in an amsotropic behaviour of all physical quantities. We calculate the dynamical conductivity $\sigma _{xx} ({\bf q}, \omega )$ along the stripe direction and find a $\bf q$ dependent pinning peak.

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KLESSE, ROCHUS y MARCUS METZLER. "MODELING DISORDERED QUANTUM SYSTEMS WITH DYNAMICAL NETWORKS". International Journal of Modern Physics C 10, n.º 04 (junio de 1999): 577–606. http://dx.doi.org/10.1142/s0129183199000449.

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It is the purpose of the present article to show that so-called network models, originally designed to describe static properties of disordered electronic systems, can be easily generalized to quantum-dynamical models, which then allow for an investigation of dynamical and spectral aspects. This concept is exemplified by the Chalker–Coddington model for the quantum Hall effect and a three-dimensional generalization of it. We simulate phase coherent diffusion of wave packets and consider spatial and spectral correlations of network eigenstates as well as the distribution of (quasi-)energy levels. Apart from that, it is demonstrated how network models can be used to determine two-point conductances. Our numerical calculations for the three-dimensional model at the Metal-Insulator transition point delivers, among others, an anomalous diffusion exponent of η=3-D2=1.7±0.1. The methods presented here in detail have been used partially in earlier work.

9

Kaveh, M. "Quantum diffusion and localization in disordered systems". Philosophical Magazine B 51, n.º 4 (abril de 1985): 453–64. http://dx.doi.org/10.1080/13642818508240591.

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10

Schuster, H. G. y V. R. Vieira. "New method for studying disordered quantum systems". Physical Review B 34, n.º 1 (1 de julio de 1986): 189–98. http://dx.doi.org/10.1103/physrevb.34.189.

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11

Hamza, Eman, Robert Sims y Günter Stolz. "Dynamical Localization in Disordered Quantum Spin Systems". Communications in Mathematical Physics 315, n.º 1 (2 de agosto de 2012): 215–39. http://dx.doi.org/10.1007/s00220-012-1544-6.

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12

Mukamel, Shaul. "Dephasing and quantum localization in disordered systems". Physical Review B 40, n.º 14 (15 de noviembre de 1989): 9945–47. http://dx.doi.org/10.1103/physrevb.40.9945.

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13

SEROTA, R. A. "QUANTUM LIMIT OF CHAOTIC SYSTEMS AS QUANTUM DIFFUSION". Modern Physics Letters B 08, n.º 20 (30 de agosto de 1994): 1243–51. http://dx.doi.org/10.1142/s0217984994001230.

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We describe classical chaotic motion in terms of diffusion in configurational space. This approach is illustrated for chaotic billiards and an oscillator with anharmonic coupling. It is argued that in the quantum limit, physical phenomena ordinarily associated with disordered metals, such as localization and mesoscopic phenomena, carry over to chaotic systems in general which are in the universality class of the nonlinear σ model.

14

CUGLIANDOLO, LETICIA F. "DISSIPATIVE QUANTUM DISORDERED MODELS". International Journal of Modern Physics B 20, n.º 19 (30 de julio de 2006): 2795–804. http://dx.doi.org/10.1142/s0217979206035308.

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This article reviews recent studies of mean-field and one dimensional quantum disordered spin systems coupled to different types of dissipative environments. The main issues discussed are: (i) The real-time dynamics in the glassy phase and how they compare to the behaviour of the same models in their classical limit. (ii) The phase transition separating the ordered – glassy – phase from the disordered phase that, for some long-range interactions, is of second order at high temperatures and of first order close to the quantum critical point (similarly to what has been observed in random dipolar magnets). (iii) The static properties of the Griffiths phase in random king chains. (iv) The dependence of all these properties on the environment. The analytic and numeric techniques used to derive these results are briefly mentioned.

15

Maiti, Santanu K. "Quantum Transport in Bridge Systems". Solid State Phenomena 155 (mayo de 2009): 71–85. http://dx.doi.org/10.4028/www.scientific.net/ssp.155.71.

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We study electron transport properties of some molecular wires and a unconventional disordered thin film within the tight-binding framework using Green's function technique. We show that electron transport is significantly affected by quantum interference of electronic wave functions, molecule-to-electrode coupling strengths, length of the molecular wire and disorder strength. Our model calculations provide a physical insight to the behavior of electron conduction across a bridge system.

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CRUZEIRO-HANSSON, L., J. O. BAUM y J. L. FINNEY. "Electron States in Static Disordered Systems and Fluid Systems". International Journal of Modern Physics C 02, n.º 01 (marzo de 1991): 305–9. http://dx.doi.org/10.1142/s012918319100038x.

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The path integral formulation of quantum statistical mechanics is used to study the effect of structural disorder on the electron states at finite temperatures. The following systems are investigated: an excess electron in a) a perfect hard spheres crystal, b) a hard spheres crystal with a vacancy and c) a hard spheres fluid. The localizing effect of a vacancy on the electron equals that of a fluid environment.

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Aleiner, I. L., B. L. Altshuler y M. E. Gershenson. "Comment on “Quantum Decoherence in Disordered Mesoscopic Systems”". Physical Review Letters 82, n.º 15 (12 de abril de 1999): 3190. http://dx.doi.org/10.1103/physrevlett.82.3190.

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18

Vanzan, Tommaso y Lamberto Rondoni. "Quantum thermostatted disordered systems and sensitivity under compression". Physica A: Statistical Mechanics and its Applications 493 (marzo de 2018): 370–83. http://dx.doi.org/10.1016/j.physa.2017.11.009.

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19

Lu, Min, Na Jiang y Xin Wan. "Quasihole Tunneling in Disordered Fractional Quantum Hall Systems*". Chinese Physics Letters 36, n.º 8 (agosto de 2019): 087301. http://dx.doi.org/10.1088/0256-307x/36/8/087301.

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20

Garreau, Jean-Claude. "Quantum simulation of disordered systems with cold atoms". Comptes Rendus Physique 18, n.º 1 (enero de 2017): 31–46. http://dx.doi.org/10.1016/j.crhy.2016.09.002.

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21

Belitz, D. y T. R. Kirkpatrick. "Quantum ferromagnetic transition in disordered itinerant electron systems". Europhysics Letters (EPL) 35, n.º 3 (20 de julio de 1996): 201–6. http://dx.doi.org/10.1209/epl/i1996-00554-7.

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22

Giona, Massimiliano. "Some observations on quantum mechanics in disordered systems". Chaos, Solitons & Fractals 3, n.º 2 (marzo de 1993): 203–9. http://dx.doi.org/10.1016/0960-0779(93)90066-a.

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23

Schehr, G., T. Giamarchi y P. Le Doussal. "Thermodynamics of disordered elastic systems in the Bragg glass phase". Journal de Physique IV 12, n.º 9 (noviembre de 2002): 311–12. http://dx.doi.org/10.1051/jp4:20020422.

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We study the thermodynamics of a pinned quantum object when the elastic description applies, e.g. in the Bragg glass phase for a crystal with point disorder or for a single elastic line. Using the replica variational method we compute the specific heat both in the quantum and classical limits. In the quantum regime, we show that the specific heat behaves - at low temperature - as T3 in dimension $d = 2$ and $d = 3$.

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Zharekeshev, I. Kh y B. Kramer. "Parametric motion of energy levels in quantum disordered systems". Physica A: Statistical Mechanics and its Applications 266, n.º 1-4 (abril de 1999): 450–55. http://dx.doi.org/10.1016/s0378-4371(98)00629-3.

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25

Jalabert, Rodolfo A. y Jean-Louis Pichard. "Quantum Mesoscopic Scattering: Disordered Systems and Dyson Circular Ensembles". Journal de Physique I 5, n.º 3 (marzo de 1995): 287–324. http://dx.doi.org/10.1051/jp1:1995128.

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26

Zharekeshev, I. Kh y B. Kramer. "Advanced Lanczos diagonalization for models of quantum disordered systems". Computer Physics Communications 121-122 (septiembre de 1999): 502–4. http://dx.doi.org/10.1016/s0010-4655(99)00392-6.

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27

Jayannavar, A. M. "Scaling theory of quantum resistance distributions in disordered systems". Pramana 36, n.º 6 (junio de 1991): 611–19. http://dx.doi.org/10.1007/bf02845799.

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28

Wreszinski, Walter F. "Progress in the mathematical theory of quantum disordered systems". Journal of Mathematical Physics 53, n.º 12 (diciembre de 2012): 123307. http://dx.doi.org/10.1063/1.4770066.

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29

Yamada, Hiroaki, Masaki Goda, Yoji Aizawa y Mitsusada Sano. "Scaling of Quantum Diffusion in One-Dimensional Disordered Systems". Journal of the Physical Society of Japan 61, n.º 9 (15 de septiembre de 1992): 3050–53. http://dx.doi.org/10.1143/jpsj.61.3050.

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30

Kearney, M. J. "Semiclassical versus quantum magnetotransport in two-dimensional disordered systems". Semiconductor Science and Technology 7, n.º 6 (1 de junio de 1992): 804–9. http://dx.doi.org/10.1088/0268-1242/7/6/012.

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31

Shindou, Ryuichi, Ryota Nakai y Shuichi Murakami. "Disordered topological quantum critical points in three-dimensional systems". New Journal of Physics 12, n.º 6 (17 de junio de 2010): 065008. http://dx.doi.org/10.1088/1367-2630/12/6/065008.

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32

Torres-Herrera, E. J. y Lea F. Santos. "Extended nonergodic states in disordered many-body quantum systems". Annalen der Physik 529, n.º 7 (13 de enero de 2017): 1600284. http://dx.doi.org/10.1002/andp.201600284.

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33

Paja, A. y G. J. Morgan. "Quantum Interference Effects, Magnetoresistance and Localisation in Disordered Systems". physica status solidi (b) 206, n.º 2 (abril de 1998): 701–11. http://dx.doi.org/10.1002/(sici)1521-3951(199804)206:2<701::aid-pssb701>3.0.co;2-6.

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34

Portengen, T., J. R. Chapman, V. Nikos Nicopoulos y N. F. Johnson. "Optics with Quantum Hall Skyrmions". International Journal of Modern Physics B 12, n.º 01 (10 de enero de 1998): 1–35. http://dx.doi.org/10.1142/s0217979298000028.

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A novel type of charged excitation, known as a Skyrmion, has recently been discovered in quantum Hall systems with filling factor near ν=1. A Skyrmion — which can be thought of as a topological twist in the spin density of the electron gas — has the same charge as an electron, but a much larger spin. In this review we present a detailed theoretical investigation of the optical properties of Skyrmions. Our results provide means for the optical detection of Skyrmions using photoluminescence (PL) spectroscopy. We first consider the optical properties of Skyrmions in disordered systems. A calculation of the luminescence energy reveals a special optical signature which allows us to distinguish between Skyrmions and ordinary electrons. Two experiments to measure the optical signature are proposed. We then turn to the optical properties of Skyrmions in pure systems. We show that, just like an ordinary electron, a Skyrmion may bind with a hole to form a Skyrmionic exciton. The Skyrmionic exciton can have a lower energy than the ordinary magnetoexciton. The optical signature of Skyrmions is found to be a robust feature of the PL spectrum in both disordered and pure systems.

35

Scholes, Gregory D. "Large Coherent States Formed from Disordered k-Regular Random Graphs". Entropy 25, n.º 11 (6 de noviembre de 2023): 1519. http://dx.doi.org/10.3390/e25111519.

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The present work is motivated by the need for robust, large-scale coherent states that can play possible roles as quantum resources. A challenge is that large, complex systems tend to be fragile. However, emergent phenomena in classical systems tend to become more robust with scale. Do these classical systems inspire ways to think about robust quantum networks? This question is studied by characterizing the complex quantum states produced by mapping interactions between a set of qubits from structure in graphs. We focus on maps based on k-regular random graphs where many edges were randomly deleted. We ask how many edge deletions can be tolerated. Surprisingly, it was found that the emergent coherent state characteristic of these graphs was robust to a substantial number of edge deletions. The analysis considers the possible role of the expander property of k-regular random graphs.

36

Bouyer, P. "Quantum gases and optical speckle: a new tool to simulate disordered quantum systems". Reports on Progress in Physics 73, n.º 6 (5 de mayo de 2010): 062401. http://dx.doi.org/10.1088/0034-4885/73/6/062401.

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37

UCHAIKIN, VLADIMIR V. y RENAT T. SIBATOV. "ANOMALOUS KINETICS OF CHARGE CARRIERS IN DISORDERED SOLIDS: FRACTIONAL DERIVATIVE APPROACH". International Journal of Modern Physics B 26, n.º 31 (4 de diciembre de 2012): 1230016. http://dx.doi.org/10.1142/s0217979212300162.

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Anomalous (non-Gaussian) kinetics is often observed in various disordered materials, such as amorphous semiconductors, porous solids, polycrystalline films, liquid-crystalline materials, polymers, etc. Recently the anomalous relaxation-diffusion processes have been observed in nanoscale systems: nanoporous silicon, glasses doped by quantum dots, quasi-one-dimensional (1D) systems, arrays of colloidal quantum dots, and some others. The paper presents a review of new approach, based on fractional kinetic equations. We give a physical basis for some fractional equations deriving them from their classical counterparts by means of averaging over statistical ensemble of disordered media. We consider self-similarity as the main feature of these processes, and explain memory phenomena in frameworks of hidden variables conception.

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NEILSON, DAVID y D. J. WALLACE GELDART. "QUANTUM CRITICAL BEHAVIOUR IN THE INSULATING REGION OF THE 2D METAL INSULATOR TRANSITION". International Journal of Modern Physics B 20, n.º 30n31 (20 de diciembre de 2006): 5229–38. http://dx.doi.org/10.1142/s0217979206036314.

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We show the insulating region of the metal-insulator transition phenomena in disordered two-dimensional electron systems contains new information about the quantum critical dynamics at low T because the insulating region and the quantum critical region are two aspects of the localized phase.

39

Glatz, A. y T. Nattermann. "Quantum phase slips and thermal fluctuations in one-dimensional disordered density waves". Journal de Physique IV 12, n.º 9 (noviembre de 2002): 123–26. http://dx.doi.org/10.1051/jp4:20020376.

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The low temperature phase diagram of 1D disordered quantum systems like charge or spin density waves, superfluids, and related systems is considered by a full finite T renormalization group approach for the first time. At zero temperature the consideration of quantum phase slips leads to a new scenario for the unpinning (delocalization) transition. In the strong pinning limit the model is solved exactly. At finite T a rich crossover diagram with various scaling regions is found which reflects the zero temperature quantum critical behavior.

40

Buth, K. y U. Merkt. "Quantum Hall effect in intentionally disordered two‐dimensional electron systems". Annalen der Physik 514, n.º 12 (diciembre de 2002): 843–91. http://dx.doi.org/10.1002/andp.20025141201.

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41

DeGottardi, Wade y Mohammad Hafezi. "Stability of fractional quantum Hall states in disordered photonic systems". New Journal of Physics 19, n.º 11 (14 de noviembre de 2017): 115004. http://dx.doi.org/10.1088/1367-2630/aa89a5.

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42

Kanter, I. y B. Doucot. "Applications of gauge invariance to quantum disordered many-spin systems". Physical Review B 38, n.º 16 (1 de diciembre de 1988): 11882–84. http://dx.doi.org/10.1103/physrevb.38.11882.

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43

Blanc, Xavier y Mathieu Lewin. "Existence of the thermodynamic limit for disordered quantum Coulomb systems". Journal of Mathematical Physics 53, n.º 9 (septiembre de 2012): 095209. http://dx.doi.org/10.1063/1.4729052.

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44

Sondhi, S. L. y M. P. Gelfand. "Off-diagonal long range order in disordered quantum Hall systems". Physica B: Condensed Matter 212, n.º 3 (agosto de 1995): 295–98. http://dx.doi.org/10.1016/0921-4526(95)00380-r.

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45

Yamada, Hiroaki y Masaki Goda. "Numerical study of quantum diffusion in two-dimensional disordered systems". Physics Letters A 194, n.º 4 (noviembre de 1994): 279–84. http://dx.doi.org/10.1016/0375-9601(94)91250-5.

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46

Itoi, C. "General Properties of Overlap Operators in Disordered Quantum Spin Systems". Journal of Statistical Physics 163, n.º 6 (30 de abril de 2016): 1339–49. http://dx.doi.org/10.1007/s10955-016-1527-7.

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47

Hattori, Kiminori. "Quantized Spin Transport in Magnetically-Disordered Quantum Spin Hall Systems". Journal of the Physical Society of Japan 80, n.º 12 (15 de diciembre de 2011): 124712. http://dx.doi.org/10.1143/jpsj.80.124712.

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48

Prigodin, V. N. y B. L. Altshuler. "Long-Range Spatial Correlations of Eigenfunctions in Quantum Disordered Systems". Physical Review Letters 80, n.º 9 (2 de marzo de 1998): 1944–47. http://dx.doi.org/10.1103/physrevlett.80.1944.

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49

Mohseni, M., A. Shabani, S. Lloyd, Y. Omar y H. Rabitz. "Geometrical effects on energy transfer in disordered open quantum systems". Journal of Chemical Physics 138, n.º 20 (28 de mayo de 2013): 204309. http://dx.doi.org/10.1063/1.4807084.

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50

Buth, K. y U. Merkt. "Quantum Hall effect in intentionally disordered two-dimensional electron systems". Annalen der Physik 11, n.º 12 (diciembre de 2002): 843–91. http://dx.doi.org/10.1002/1521-3889(200212)11:12<843::aid-andp843>3.0.co;2-z.

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Artículos de revistas sobre el tema "Disordered quantum systems"

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