The MULTIPROBE LT XP System  | © Scienta Omicron
MULTIPROBE LT XP system with an extension for a VT AFM XA. The LT STM features QPlus AFM operation. The preparation chamber is equipped for sputtering, thin film growth and tip preparation (electron beam heating).
LT STM spring suspension  | © Scienta Omicron
Scienta Omicron’s unique design of temperature-compensated spring suspension allows STM and AFM operation at any accessible temperature from 300 K to 5 K without opening the system for re-adjustment.

LT STM

Ultimate SPM Performance below 5 K

SPMLT SPMSTMSTSLT STMSP-STMSP-STSIETSBEEMTERSHDLManipulationNanolithographyAFMnc-AFMQPlus AFM

  • Increased hold time to > 65h at same performance level
  • Leading QPlus® AFM technology
  • Outstanding spectroscopy resolution
  • 3D movable lens for optical experiments
  • Record proven platform since 1996 with more than 200 devices installed

Since its introduction in 1996, Scienta Omicron´s Low Temperature STM has set the standard for stability, performance and productivity for 4LHe bath cryostat STMs. It is a high quality allrounder SPM delivering broad scientific output and regularly groundbreaking results employing usually more than one technique. It´s base is an ultra-stable platform offering a large range of operation modes including STM, QPlus AFM, STS, IETS, force spectroscopy, optical experiments and atom manipulation. 

More than 20 years after presenting the LT STM, the importance of low temperature SPM techniques in a wide range of active scientific fields is still unbroken.

Deep understanding of individual molecules and their chemistry, interaction with light, manufacturing of atomic scale device, 2D materials, superconductors, semiconductors, gases on metals, and magnetics are only a few examples where research takes great advantage of low temperature SPM. Within all these areas more publications have been produced with our LT STM than with all other commercial low temperature SPM´s combined.

More Information

The Third Generation of the LT STM

A key feature of the third generation LT STM is a 30 % increase in liquid helium hold time. This is of great advantage for all low temperature experiments, reducing operating costs and providing users more flexibility. The new cryostat design enables long-term spectroscopy experiments without any compromise to the stability the LT STM has always delivered.

Additionally, completely new state of the art wiring and connections have been designed throughout the system. The LT STM III now supports high frequency lines for tip and sample to enable time resolved STM experiments in the GHz range.

Further, the ultimate energy resolution for spectroscopy has been improved to < 1 meV, ideal for work with superconducting materials. When combined with the MATRIX 4 controller and its new, high performance PLL, performing QPlus® AFM experiments in the LT STM will be easier and more powerful than any other QPlus® AFM platform.

This third generation of the LT STM enables our customers to carry out the most advanced low temperature STM, spectroscopy and QPlus® AFM experiments. And like its previous iterations, the ease-of-use, stability and proven reliability in the LT STM ensure a high productivity, workhorse microscope. 

QPlus® AFM

Atom Manipulation 

Constant Height QPlus® AFM Image taken with a Copper Oxide Functionalised Tip

Constant Height QPlus® AFM Image taken with a CO-Functionalised Tip

STM Image 

Optical Access & in-situ Evaporation

The LT STM has the capability for simultaneous evaporation by two evaporators during STM operation. With the sample facing down, deposition of materials from below becomes possible.

In addition, the large Z-coarse range of 10 mm for tip positioning allows for removal of the tip from the evaporation zone. The easy to operate thermal shield compartment consists of two shield pairs for LHe and LN2 shielding, respectively. To minimise heat impact, the shield concept provides three wobble stick selectable configurations:

  • SPM operation with Tmin < 5 K;
  • evaporation port open and sample/sensor exchange port closed; and
  • sample/sensor exchange port open and evaporation port closed.

The four optical ports remain permanently open, while exchangeable IR-blocked quartz windows prevent heat impact.

Easy and Safe Sensor Exchange

Sensors are exchanged under remote-control using Scienta Omicron’s patented piezo-inertia coarse positioning drives. A sensor is transferred through the UHV system on a transfer plate with a 'keyhole' cut-out and a magnet to secure the sensor. The sensor is picked up by the scanner using the remote-controlled coarse motors with observation via a long focal length CCD camera. The risk of mechanical damage is reduced to a minimum and sensor exchange is typically carried out within a few minutes.

Versatility & Ease of Use

Magnetic Fields: Based on a magnet coil located behind the sample plate, vertical fields can be generated in the LT STM. The use of superconducting wires avoids heat generation during operation. Coil options for pulsed fields or DC fields are available.

Variable Temperatures: The LT STM is equipped with a built-in PBN heater element and a Si diode for temperature measurement. The heater enables quick temperature variation between 5 K to ~ 60 K (LHe operation) and 78 K to ~ 250 K (LN2 operation).

Sample Contacts: The option for 4 spring-loaded electrical sample contacts provides flexibility to drive experimental devices, measure signals or apply additional potentials.

Advanced Optical Experiments

Optical spectroscopy techniques like near-infrared, Tip Enhanced Raman Spectroscopy (TERS) or low-temperature fluorescence provide detailed information about the chemical and enviromental structure on organic systems. Here, we introduce our new concept for advanced optical experiments at helium temperature in ultra-high vacuum environment.

To guarantee best optical conditions, the optical integration is optimised on the following key factors:

  • Highest detection efficiency is provided by the numerical aperture (NA) of NA > 0.4 which results in a theoretical focus diameter of 835 nm at 532 nm excitation wavelength.
  • The angle of incidence in this setup is optimised to 30°.
  • Three piezo-motors allow the adjustment of the lens in the full temperature range from 4.5 K to 300 K.
  • The x/y piezo motor is moving within the sample coordinate system, while the z-piezo motor is oriented along the optical axis of the lens. This ensures convenient operation of the optical setup.

In combination with the proven performance of the LT STM, this modification allows a broad range of new and exciting experiments.

 

Example of Static Lens Setup for STL and TERS Applications

Results

Selective Triplet Exciton Formation in a Single Molecule

Selective Triplet Exciton Formation in a Single Molecule

2020

In this work, Kimura K. et al report a single-molecule investigation of electroluminescence using a scanning tunneling microscope and demonstrate a simple method of selective formation of T1 excitons that utilizes a charged molecule....

The qPlus Sensor, a Powerful Core for the Atomic Force Microscope

2019

Atomic force microscopy (AFM) was introduced in 1986 and has since made its way into surface science, nanoscience, chemistry, biology, and material science as an imaging and manipulating tool with a rising number of applications....

Semimetal-to-Semiconductor Transition and Charge-Density-Wave Melting in 1T-TiSe2-xSx Single Crystals

2018

The transition metal dichalcogenide 1T-TiSe2 is a quasi-two-dimensional layered material with a phase transition towards a commensurate charge density wave (CDW) at a critical temperature Tc ≈ 200K. The relationship between the...

Multi-Orbital Charge Transfer at Highly Oriented Organic/Metal Interfaces

2017

The molecule–substrate interaction plays a key role in charge injection organic-based devices. Charge transfer at molecule–metal interfaces strongly affects the overall physical and magnetic properties of the system, and ultimately...

Reference systems

Angle-Resolved Photoemission combined with Low-Temperature SPM and MBE | © Scienta Omicron
64605

LT STM Lab Combined with High-End ARPES

Research focus on topological insulators and quantum anomalous Hall effect, interface high-temperature superconductivity, quantum size effect induced novel properties, and atomic-level controlled growth of various nanostructures by MBE.

more
LT SPM QPlus with Large RM Preparation Chamber for Various Sources, at the Low Dimensional Nanomaterials Vacuum Laboratory, Kunming University of Science and Technology | © Scienta Omicron
154224

LT SPM QPlus with Large RM Preparation Chamber

Research focus on the preparation of low dimensional nano fine structure and chemical reaction mechanisms under ultra-high vacuum conditions.

more
Combined Low-temperature Scanning Tunneling Microscope, Atomic Force Microscope (LT-STM/AFM), and Molecular Beam Epitaxy (MBE) System | © Scienta Omicron
162907

LT STM Lab with QPlus AFM, ARPES and MBE

Combined low-temperature (T < 5K) Scanning Tunneling Microscope (LT-STM/AFM) with ARPES and Molecular Beam Epitaxy (MBE) system, incorporating in-situ electronic transport measurements, optical access, and crystal growth capability.

more
LT STM, MIP and MBE at Wuhan University | © Scienta Omicron
182908

Materials Innovation Platform (MIP) with LT STM and MBE

more
Cluster System with LT STM and Lab10 MBE at Peking University  | © Scienta Omicron
135120

Cluster System with LT STM and Lab10 MBE

Research mainly focuses on the electronic transport properties of low dimensional superconducting, semiconducting, ferromagnetic, metallic structures and topological insulators in hybrid nano-devices.

more
Multiprobe LT XA platform for advanced STM and QPlus AFM work in combination with optics (TERS and STL).  | © Scienta Omicron
180615

LT STM Lab with QPlus AFM for Optical Experiments

Multiprobe LT XA platform for advanced STM and QPlus AFM work in combination with optics (TERS and STL). 

more
R3000 and LT-SPM | © Scienta Omicron
63209

LT STM Lab with R3000 for ARPES

MULTIPROBE LT XA platform in Nottingham, GB, delivers High-Performance STM/AFM (QPlus) and High-Resolution UPS/ARPES results. 

more
LT STM  | © Scienta Omicron
64607

LT STM Lab Combined with VT AFM

The MULTIPROBE LT XP system with an extension for a VT AFM XA. The LT STM features QPlus AFM operation. The preparation chamber is equipped for sputtering, thin film growth and tip preparation (electron beam heating).

more
Customised Low-Temperature System Solutions | © Scienta Omicron
65010

Customised LT STM Lab with VT AFM, XPS, AES, an ISS

In this system the MULTIPROBE XP is combined with a versatile analysis chamber. A central sample distribution chamber connects both of the system modules.

more

Downloads

LT STM TERS

1.63 MB

TERS - our new concept for advanced optical experiments at helium temperature in ultra-high vacuum environment.

LT STM III: Ultimate SPM Performance Below 5 K

5 MB

Since its introduction in 1996, Scienta Omicron´s Low Temperature STM has set the standard for stability, performance and productivity for 4LHe bath cryostat STMs. It is a high quality allrounder SPM delivering broad scientific output and regularly groundbreaking results employing usually more than one technique. Its base is an ultra-stable platform offering a large range of operation modes including STM, QPlus AFM, STS, IETS, force spectroscopy, optical experiments and atom manipulation. Scienta Omicron´s LT STM Qplus AFM imaging of “on-surface chemistry”, atom manipulation, carbon, superconductors, semiconductors, gases on metals, and magnetics are only a few examples where research takes great advantage of low temperature SPM.

ZyVector: STM Control System for Lithography

2.59 MB

Scienta Omicron and Zyvex Labs announce a collaboration to develop and distribute tools for research and manufacturing that require atomic precision. The ZyVector STM Control System from Zyvex Labs turns a Scienta Omicron STM into an atomically-precise scanned probe lithography tool, and will be distributed world-wide by Scienta Omicron.

Zyvector Booklet

3.64 MB

Zyvex Labs pursues research and develops tools for creating quantum computers and other transformational systems that require atomic precision, towards its eventual goal of Atomically Precise Manufacturing. As part of this effort, ZyVector turns the world-class Scienta Omicron VT-STM into an STM lithography tool, creating the only complete commercial solution for atomic precision lithography.

Zyvex CHC Controller

2.78 MB

Scienta Omicron and Zyvex Labs announce a new leap forward in STM design; real- time position correction. The ZyVector STM control system from Zyvex Labs uses live position correction to enable atomic-precision STM lithography. Now the same live position correction technology is brought to the Matrix STM control system for microscopy and spectroscopy users, enabling fast settling times after large movements in x, y and z, and precise motion across the surface, landing and remaining at the desired location.

LT STM: Atomic-scale rewritable memory using scanning tunnelling microscopy techniques

01/01/2018 460.02 KB

Prof. Wolkow and his co-workers at the University of Alberta in Edmonton, Canada have created the most dense, solid-state memory in history using scanning probe microscopy techniques.

QPlus AFM on NaCl (001) at Low Oscillation Amplitudes using Matrix 4 AFM PLL with TipGuard

01/01/2018 2.75 MB

The improved QPlus AFM sensors is equipped with 1) the newest generation of Giessibl sensors; 2) integrated electrodes; 3) new high precision manufacturing; 4) higher Q-factor ≈ 90.000 at T=5K; and 5) better reliability.

Services & Spare-parts

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