Cryogenic scanning tunneling microscope for quantum dot spectroscopy

Chang, Tay-Rong; Yang, Chaodong; Yang, M. J.; Dottellis, J. B.

doi:10.1063/1.1379608

Cited by 10 publications

(3 citation statements)

References 65 publications

(57 reference statements)

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“…In cryogenic applications, this is impractical due to the limited space available in the cryostat and the low temperatures. Most cryogenic microscopes use a "stick-slip" translation motor driven by piezoe1ec:tric actuators [59,60,61,62,63,64,65,661. The coarse approach motor we have chosen is a Besocke "beetle" [67, 681 design.…”

Section: Scanning Probe Microscope Designmentioning

confidence: 99%

Imaging Transport Resonances in the Quantum Hall Effect

Steele

Ashoori

Pfeiffer³

et al. 2005

Phys. Rev. Lett.

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We use a scanning capacitance probe to image transport in the quantum Hall system. Applying a DC bias voltage to the tip induces a ring-shaped incompressible strip (IS) in the 2D electron system (2DES) that moves with the tip. At certain tip positions, short-range disorder in the 2DES creates a quantum dot island in the IS. These islands enable resonant tunneling across the IS, enhancing its conductance by more than four orders of magnitude. The images provide a quantitative measure of disorder and suggest resonant tunneling as the primary mechanism for transport across ISs.

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Section: Scanning Probe Microscope Designmentioning

confidence: 99%

Imaging Transport Resonances in the Quantum Hall Effect

Steele

Ashoori

Pfeiffer³

et al. 2005

Phys. Rev. Lett.

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“…To ensure a safe approach, the step size of the approach motor should be ∼10 times smaller than the height range of the scanning piezo: with a typical height range of 1 μm the step size including possible overshoots should be less than 100 nm. Several different piezoelectric motors are applied, like the walker introduced by Pan, 4-9 the inchworm type, [10][11][12][13][14][15][16][17][18][19][20][21] the Besocke beetle type, [22][23][24][25][26][27][28][29][30][31] and inertial sliders. [32][33][34][35][36][37][38] However, despite some advantages all of these motors have some severe disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Improving the accuracy of walking piezo motors

Heijer

Fokkema

Saedi

et al. 2014

Review of Scientific Instruments

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Many application areas require ultraprecise, stiff, and compact actuator systems with a high positioning resolution in combination with a large range as well as a high holding and pushing force. One promising solution to meet these conflicting requirements is a walking piezo motor that works with two pairs of piezo elements such that the movement is taken over by one pair, once the other pair reaches its maximum travel distance. A resolution in the pm-range can be achieved, if operating the motor within the travel range of one piezo pair. However, applying the typical walking drive signals, we measure jumps in the displacement up to 2.4 μm, when the movement is given over from one piezo pair to the other. We analyze the reason for these large jumps and propose improved drive signals. The implementation of our new drive signals reduces the jumps to less than 42 nm and makes the motor ideally suitable to operate as a coarse approach motor in an ultra-high vacuum scanning tunneling microscope. The rigidity of the motor is reflected in its high pushing force of 6.4 N.

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“…[1][2][3][4][5][6][7][8][9][10][11][12] For high-quality STM measurements, one has to be able to measure small currents, while reaching low-level tunnel current noise and a sufficient bandwidth. Therefore, the development of efficient current-voltage (I -V) converters is required.…”

Section: Introductionmentioning

confidence: 99%

Low noise current-to-voltage converter and vibration damping system for a low-temperature ultrahigh vacuum scanning tunneling microscope

Libioulle

Radenović

Bystrenová

et al. 2003

Review of Scientific Instruments

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Articles you may be interested in A low-noise and wide-band ac boosting current-to-voltage amplifier for scanning tunneling microscopy Rev. Sci. Instrum. 76, 023703 (2005) The design of low-temperature tunnel current converters and the design of a low-temperature damping stage for a scanning tunneling microscope ͑STM͒ are presented. The current amplifiers are able to measure very low tunnel current ͑down to 0.25 pA͒, while preserving a sufficient bandwidth for topographic and spectroscopic measurements and with very low noise characteristics ͑down to 3 fA Hz͒. The design of a compact low-temperature magnetic damping stage with a resonance frequency of about 7 Hz, protecting the microscope mechanics against mechanical vibrations of the cryostat is also described. The damped stage with the microscope mechanics is in contact with the cryostat during cooling, while during the STM measurements, it is mechanically isolated.

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Cryogenic scanning tunneling microscope for quantum dot spectroscopy

Cited by 10 publications

References 65 publications

Imaging Transport Resonances in the Quantum Hall Effect

Imaging Transport Resonances in the Quantum Hall Effect

Improving the accuracy of walking piezo motors

Low noise current-to-voltage converter and vibration damping system for a low-temperature ultrahigh vacuum scanning tunneling microscope

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