Suppressed density of states in self-generated Coulomb glasses

Rademaker, Louk; Nussinov, Zohar; Dobrosavljević, Vladimir

doi:10.1088/1367-2630/aab8ce

Cited by 11 publications

(8 citation statements)

References 38 publications

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“…There, stability arguments imply that the DOS of an interacting electron system in the presence of quenched disorder must vanish at the Fermi energy [26], due to their long-range mutual interactions. Similar physics was also reported in clean classical Coulomb liquids, where it was shown that the long-distance potentials from electrons beyond the correlation length, when taken collectively, act as a source of (self-generated) randomness [8,16,[27][28][29]. The observations presented in Fig.…”

Section: Self-generated Randomness and Short-range Correlationssupporting

confidence: 82%

“…Figure 2(b) shows that, prior to the pseudogap opening observed in the full electronic spectrum, a broad dip develops already in the distribution of site potentials. Interestingly, its shape at the transition is compatible with that caused by shortrange charge correlations in self-generated Coulomb glasses, P ∼ e −V/ξ |φ| (dashed line) [29]. There, the correlation hole that forms around electrons in order to minimize their mutual interactions was shown to deplete the classical DOS below the ES bound, P ES ∼ |φ| (P ES ∼ |φ| d/α−1 in the general case in d dimensions and exponent α).…”

Section: Self-generated Randomness and Short-range Correlationssupporting

confidence: 53%

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Pseudogap metal induced by long-range Coulomb interactions

Ralko

Fratini

2021

Phys. Rev. B

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Section: Self-generated Randomness and Short-range Correlationssupporting

confidence: 82%

Section: Self-generated Randomness and Short-range Correlationssupporting

confidence: 53%

Pseudogap metal induced by long-range Coulomb interactions

Ralko

Fratini

2021

Phys. Rev. B

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“…Both types of systems are expected to feature a relatively shallow energy landscape of accessible states due to their proximity to a uniform liquid state. It is interesting to note a possibly related observation that the ensemble of metastable states in self-generated Coulomb glasses is shallow compared with more ordinary electron glasses relying on quench disorder (31).…”

mentioning

confidence: 99%

Aging, memory, and nonhierarchical energy landscape of spin jam

Samarakoon

Sato

Chen

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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The notion of complex energy landscape underpins the intriguing dynamical behaviors in many complex systems ranging from polymers, to brain activity, to social networks and glass transitions. The spin glass state found in dilute magnetic alloys has been an exceptionally convenient laboratory frame for studying complex dynamics resulting from a hierarchical energy landscape with rugged funnels. Here, we show, by a bulk susceptibility and Monte Carlo simulation study, that densely populated frustrated magnets in a spin jam state exhibit much weaker memory effects than spin glasses, and the characteristic properties can be reproduced by a nonhierarchical landscape with a wide and nearly flat but rough bottom. Our results illustrate that the memory effects can be used to probe different slow dynamics of glassy materials, hence opening a window to explore their distinct energy landscapes. memory | energy landscape | spin jam | spin glass I f the energy landscape of a system resembles a smooth vase with a pointy bottom end, upon cooling the system goes quickly into the lowest energy state, i.e., the global ground state, that is usually associated with crystalline order. If the energy landscape is more complex with many metastable states, i.e., local minima, then cooling may lead the system into local minima resulting in a glassy order. The concept of such energy landscapes has been instrumental in explaining the glassiness that is ubiquitous in a wide range of systems, including atomic clusters (1), structural glasses (2, 3), polymers (4), brain activity (5), and social networks (6). Several different topological types of energy landscapes were proposed to characterize different glassiness and the associated slow dynamics (7,8). For instance, a rugged funnel-shaped landscape shown in Fig. 1A was proposed to understand the physics of biopolymers (9, 10) and dilute magnetic alloys called spin glass (11).Magnetic glass systems (12-16) present a unique opportunity to microscopically study the relation between the energy landscape and low temperature properties. The most studied magnetic glass state is the conventional spin glass realized in dilute magnetic alloys such as CuMn and AuFe. Here, dilute magnetic ions (Mn and Fe) in a nonmagnetic metal interact via the longrange Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction whose magnitude and sign change with distance between the randomly placed magnetic ions (11). The randomness drives the system into the spin glass state below a critical temperature, T f , that is comparable to the mean-field magnetic energy scale, i.e., the absolute value of the Curie-Weiss temperature, jΘ CW j. For instance, for Cu − 2 atomic (at.) % Mn (CuMn2% hereafter), Θ CW = −45 K and T f = 15.5 K. Another distinct glassy state called a spin jam has been recently suggested to appear in densely populated frustrated magnets (17-21). At the mean-field level, these systems are expected to remain in a classical spin liquid down to absolute zero temperature, due to macroscopic classical ground state dege...

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“…The CG exhibits several hallmarks of glass, which include emergence of a charge inhomogeneity [5,6], an exponential slowing down of electron dynamics [1,2], and ergodicity breaking signified by the cooling-rate dependence and aging of resistivity [2] as well as electronic crystallization from glass [5,7], all being in line with the fundamental concept of classical structural glasses [8][9][10]. Note that the emergent CG state in organics originates from a geometrical frustration in Coulomb interactions on triangular-like lattices [3,[11][12][13], where a vast number of charge patterns are degenerate similarly to in spin-frustrated systems [14], and is conceptually distinguished from widely observed electronic inhomogeneity caused by randomly located dopants [15][16][17]. Thus, the CG state serves as a novel platform for developing the physics of frustration in charge sector.…”

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confidence: 63%

Anomalous 2D-confined electronic transport in layered organic charge-glass systems

Sato,

Miyagawa,

Tamura

et al. 2020

Preprint

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To get insight into the nature of the electronic fluid in the frustration-driven charge glasses, we investigate in-plane and out-of-plane charge transport for four quasi-triangular-lattice organic systems, θ-(BEDT-TTF)2X [X=RbZn(SCN)4, CsZn(SCN)4 and I3] and α-(BEDT-TTF)2I3. These compounds host a charge order, charge glass and Fermi liquid, depending on the strength of charge frustration. We find that the resistivity exhibits extremely two-dimensional (2D) anisotropy and distinct temperature dependences between in the in-plane and out-of-plane directions in the charge glass phase, qualitatively distinguished from the charge order and metallic states. The experimental features indicate that an anomalous 2D-confined electronic fluid with possible charge excitations other than conventional quasiparticles emerges in the charge glass state realized on frustrated lattices.

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Suppressed density of states in self-generated Coulomb glasses

Cited by 11 publications

References 38 publications

Pseudogap metal induced by long-range Coulomb interactions

Pseudogap metal induced by long-range Coulomb interactions

Aging, memory, and nonhierarchical energy landscape of spin jam

Anomalous 2D-confined electronic transport in layered organic charge-glass systems

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